tag:blogger.com,1999:blog-12754869195868580462024-03-21T01:20:31.964-07:00PA3BAK Radio PagesMy latest project is building two SDR's in one, ruggedized case for serious outdoor and field work.
In my opinion, Airspy SDR and the SDRplay are modules - not 'equipment'. Just fit the modules in a serious case along with some useful extra's and then you finally get 'equipment' that is ready to use under different circumstances.
Measures are taken to avoid unwanted interference such as local RFI, QRM from home appliances and noise from USB host power sources.
Unknownnoreply@blogger.comBlogger8125tag:blogger.com,1999:blog-1275486919586858046.post-87558235264017962012017-01-29T00:24:00.000-08:002017-01-29T00:54:45.336-08:00RSP1 is replaced by RSP2 inside the Vasyljev<div class="separator" style="clear: both; text-align: center;">
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">This heart transplantation was inevitable.<br /><br />The images tell the story by itself!<br /><br /><i>Before the transplantation:</i></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhxQyJl3UM8wcrmHVqx1NwLkYrCn21dO1vIUHViA0EmLtYKKU-7iu9U-4ZDC_zYD4W5n6OlsGwJraGw_1CBMq3ytSB1g890srYdkQ50HeaydxT74BaRNg8OH0FmDIk-1cJPlOwwFeEsoWw/s1600/IMG_6633.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhxQyJl3UM8wcrmHVqx1NwLkYrCn21dO1vIUHViA0EmLtYKKU-7iu9U-4ZDC_zYD4W5n6OlsGwJraGw_1CBMq3ytSB1g890srYdkQ50HeaydxT74BaRNg8OH0FmDIk-1cJPlOwwFeEsoWw/s640/IMG_6633.JPG" width="640" /></span></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif;"><span style="font-size: small;">Both the Airspy Mini and the RSP1 on board.</span></span></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif;"><br /><span style="font-size: large;"><i>.... and how it changed to Vasyljev 2.0</i></span></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhyhIahztVv8xiRmo2w5sSZ13z8nCdF6hyphenhypheneJjveafrrH-NLOaW4D32RBGYzufafe8kSPVliZfG72qLpVcskzw4Jd0RWorl0kaNnd_VaywB8xLbMquBZzps7edJpFkeajpcr5o-aso6cbT4/s1600/2016-12-30+20.24.57.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><span style="font-family: "georgia" , "times new roman" , serif;"><img border="0" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhyhIahztVv8xiRmo2w5sSZ13z8nCdF6hyphenhypheneJjveafrrH-NLOaW4D32RBGYzufafe8kSPVliZfG72qLpVcskzw4Jd0RWorl0kaNnd_VaywB8xLbMquBZzps7edJpFkeajpcr5o-aso6cbT4/s640/2016-12-30+20.24.57.jpg" width="640" /></span></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Removed the back pane</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">The RSP1 removed and the RSP2 on its position</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Preparing the new back pane</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Almost ready, thanks to the Dremel</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">The Hi-Z terminals in place</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Back pane</span></td></tr>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghjVEOJc8M7IqdpQEbQh86E-TCh0W2OBbtiFHc1GufdijX2G_cNySPTwTdg13rCtXi3VhPHsmLlmuAFsbpCkAfA9RyOkBYh5XhwoQKtmbpQI_CjY1n4j61_UWA7nj9y7Delv0sj2m8FaA/s1600/2017-01-05+12.08.40.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: "georgia" , "times new roman" , serif;"></span></a></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrXOBSiTFzNK0ZXiLWlAcq-pt58Zvhg-nNNnfe8MGYFWROKUMyS6BlQiHqANXFQzrgqnJ3AFBA6lI8VUngwU06qPKWS5PaAF8RIgE2xQJdz9Jg9Ik5uiqUy0XGIOKjlz0FTSbM3Dn8W6g/s1600/2017-01-05+18.17.56.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrXOBSiTFzNK0ZXiLWlAcq-pt58Zvhg-nNNnfe8MGYFWROKUMyS6BlQiHqANXFQzrgqnJ3AFBA6lI8VUngwU06qPKWS5PaAF8RIgE2xQJdz9Jg9Ik5uiqUy0XGIOKjlz0FTSbM3Dn8W6g/s640/2017-01-05+18.17.56.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Populating the back pane</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">New situation</span></td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqFiKtZRFaoDdQ_0EaAlPLndunO4Tv7GdFnS1JMQFmkEZtFDm1ydOccSM1HPcuqb7tb_BiL0i8lR_yJP0NLlCQg10kyNfYa_H5wx5-vhyphenhyphenXRUiAGd3dzvv0pYxI30UDaU3e_K_syhPG7KI/s1600/2017-01-29+09.52.00.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqFiKtZRFaoDdQ_0EaAlPLndunO4Tv7GdFnS1JMQFmkEZtFDm1ydOccSM1HPcuqb7tb_BiL0i8lR_yJP0NLlCQg10kyNfYa_H5wx5-vhyphenhyphenXRUiAGd3dzvv0pYxI30UDaU3e_K_syhPG7KI/s640/2017-01-29+09.52.00.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: Georgia, Times New Roman, serif; font-size: small;">The Hi-Z interconnection is ready</span></td></tr>
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<tr><td style="text-align: center;"><img border="0" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicsIUr6VsQh_GzlCD1iXrN12Qsz_zOEiFGydpGNrOjnxw6QJwKjr5j0K7RZ0TE5ZqZMcEiT37LqRmcs3Z1UZgXOfQbPuUnyBR-Fh0TsKO_hD7lFQ1UIxC51peX2Gd9PQf-HzJg-bcHSdE/s640/2017-01-06+12.11.21.jpg" style="margin-left: auto; margin-right: auto;" width="640" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Back pane - once again </span></td></tr>
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<tr><td style="text-align: center;"><img border="0" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_7FeZU9rOyqPDAcJoBtVkPcrgPY9BS1H3RXM6LMEryneWUfXCLPXjlUPe3xVZrxMIBwWZFIFNbMw_PUoxRl4cEbf4MBtkHOC8erHhI6AAeHvthyO00o8kz9Nh1cMfGCUhtktWzoRPuw4/s640/2017-01-06+12.11.53.jpg" style="margin-left: auto; margin-right: auto;" width="640" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">With banana to BNC adapter</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Earth plate now connected to BNC terminals becaue floating inputs were a bit noisier</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">Operating the Vasyljev 2.0</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">CAT control implemented</span></td></tr>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: small;">A wire antenna that can be connected to the Hi-Z input directly</span></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-1275486919586858046.post-69895291633729991212016-09-01T04:23:00.003-07:002016-09-01T04:23:23.138-07:00Finally: AirSpy and SDRplay under one hood<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Lately I took my aluminium-cased multi-SDR thing to the next level by adding the AirSpy Mini. Now it has two SDR receivers under one hood. I decided to go for the AirSpy mini because I want to use the rig in the field with a very light-weight 11.6" duocore laptop. It works pretty well @6MSPS and very well @3MSPS. So I am satisfied.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5ERm4VRPo4L653nmSPQFyTaqxnQKtkIBv8UWb9fqwgXRrSYmLE_G18S22TnERmMitiQtOOfo4Db-GlnngeFbUEWiurkp5PStD217n3DFTCi4NPf5JkoE3jO2tJP58yBRKLp9Sf2urtrM/s1600/IMG_6612.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5ERm4VRPo4L653nmSPQFyTaqxnQKtkIBv8UWb9fqwgXRrSYmLE_G18S22TnERmMitiQtOOfo4Db-GlnngeFbUEWiurkp5PStD217n3DFTCi4NPf5JkoE3jO2tJP58yBRKLp9Sf2urtrM/s640/IMG_6612.JPG" width="640" /></a></div>
<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><br /><br />I did some modifications as well. Originally, the USB-cables entered the enclosure through a cable gland. I wanted the cables to be left in one piece, just to keep the number of connectors in the data chain as low as possible. However, an enclosure with cables that are always connected, is not so easy to handle, looks stupid and one day the wires in the cable will break due to metal fatigue. So I mounted the best USB receptacles I could find (Amphenol, mil grade, phosphor bronze...). I works perfectly, no issues found yet.</span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">One day I will finish the project by adding the third module: a HF converter for the AirSpy mini. I am torn between the SV1AFN design and the SpyVerter. It will probably take half a year of indecision before anything happens.</span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">I clamped the AirSpy Mini to the aluminium casing to keep it cool.</span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">A picture tells more than 1000 words.</span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-1275486919586858046.post-42216464044617511262016-06-28T02:52:00.002-07:002016-06-28T06:07:10.606-07:00The SDRplay heart beats inside. What's up next?<div class="separator" style="clear: both; text-align: center;">
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">[See older posts for project step-by-step <a href="http://airspyvertersdrplay.blogspot.nl/2016_05_01_archive.html">here</a>]<br /><br />The thing, with its SDRplay heart beating inside, works like a champ. No USB noise at all, only plain atmospheric noise and a few restless electrons in all (semi)conductors. Feels like analogue times.</span></div>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">The RSP is <i>slightly professionalized</i>. The unit is mostly powered from a cheap 10000 mAh USB power bank which guarantees days of receiving fun.<br /><br />The next <i>small big thing</i> on the schedule is the <i>implantation</i> (implementation by soldering) of a second heart, the Airspy R2 and a HF converter. I have not yet decided which HF converter; The choice is between the Spyverter and the SV1AFN converter. Both have their own architectures - hence their own advantages and disadvantages. If you have any suggestions, please let me know.</span></div>
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<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">The thing, in working state</span></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Before I do the Airspy & converter implantation, I will prepare a few other small accessories.<br /><br />First I will assemble an external, ruggedized LNA unit which can be powered by either phantom or external power. I tend to the LNA4ALL. If you have any suggestions for other LNA's, please let me know.</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhENxnHGABxCCpYC7esYEy0zu9F3M4971ZRpommbi5LNfSEhAV7LaYOfQH02M5KEICcbiO8K_3EzB9aPvjfBnfNFrUFJVbQdsfvTSEQF1wGu0PGlTf-yBQcWZMG9JEwbZ00NxNpRcH6KM0/s1600/DSC03970+%2528Large%2529.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><span style="font-size: large;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhENxnHGABxCCpYC7esYEy0zu9F3M4971ZRpommbi5LNfSEhAV7LaYOfQH02M5KEICcbiO8K_3EzB9aPvjfBnfNFrUFJVbQdsfvTSEQF1wGu0PGlTf-yBQcWZMG9JEwbZ00NxNpRcH6KM0/s640/DSC03970+%2528Large%2529.JPG" width="640" /></span></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Copyright LNA4ALL</span></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">The second accessory is a FM broadcast band rejection filter. I have ordered the F1JKY filter which is a optimized Chebyschev 7-th order filter with high quality components.<br /><br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhu4MTfkC75NBVeOEm0V607Zo-E70NWsAG1ozmYtLQ0UsM29pzyRZecqpuwFc8NYTbTX-RbBvOyalkASLRAEkpoY2Ppkn_kKjm_TAOHPeq-PC7P3dCXxs3I8MauTzrvw06I7bztuucEr5Q/s1600/NOTCHFM2.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="432" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhu4MTfkC75NBVeOEm0V607Zo-E70NWsAG1ozmYtLQ0UsM29pzyRZecqpuwFc8NYTbTX-RbBvOyalkASLRAEkpoY2Ppkn_kKjm_TAOHPeq-PC7P3dCXxs3I8MauTzrvw06I7bztuucEr5Q/s640/NOTCHFM2.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Copyright F1JKY</td></tr>
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<br />The back plate of my SDR is now equipped with a M6 earth rod made of stainless steel. That can be very useful for HF listening.</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZf39ibxlzKUYQ4BTcMfhQOMsQDKXpyOXag2E3YKV6cAU02SNck4NOwgXF9cQc9jGa_GTvd0F6NNsr22MJuN_vw4b7uopMy1AO6R-0tgwAxhTcVOHziPnuNyDAHN7aQ2CV3EjhMcPpY-E/s1600/2016-06-28+11.26.05.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><span style="font-size: large;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZf39ibxlzKUYQ4BTcMfhQOMsQDKXpyOXag2E3YKV6cAU02SNck4NOwgXF9cQc9jGa_GTvd0F6NNsr22MJuN_vw4b7uopMy1AO6R-0tgwAxhTcVOHziPnuNyDAHN7aQ2CV3EjhMcPpY-E/s640/2016-06-28+11.26.05.jpg" width="640" /></span></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Earth rod</span></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif;">I will keep you informed.</span></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-1275486919586858046.post-53181034323605497332016-05-12T00:54:00.003-07:002016-06-28T23:04:31.935-07:00Operational with RF-Systems preselector and USB powerbank<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Today I did some tests with powering the unit with a 5V power bank. The 5V lead uses the same connector on the back panel, which has 4 poles, two for 12V and two for 5V. So one power supply can be used at a time.<br /><br />Also the RF-Systems P-3 preselector works great in combination with the SDRplay. An EF-SWL longwire for RX only was used.<br /><br />The EF-SWL longwire is a rugged, very portable HF antenna that yields stunning results. Highly recommended!<br /><br />[See the EHAM user reviews <a href="http://www.eham.net/reviews/detail/3707">here</a>. It gets a solid 5.0 rating after more than 40 reviews - there is no other item with a comparable rating.]</span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKiwdWF6K4IV9MLM1mYdohzDE79ZLZdwX7RZr6D59klDlBRtQIcLFgXIAkd8nwdLMzKZexA0ZOSp3n8syvSnms8Odq3-DKvuE8_EkVre4CyDQD1-kJE0d7MdWBep4IBZ3vaaNEl9ed1Ss/s1600/vasyljevvv.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKiwdWF6K4IV9MLM1mYdohzDE79ZLZdwX7RZr6D59klDlBRtQIcLFgXIAkd8nwdLMzKZexA0ZOSp3n8syvSnms8Odq3-DKvuE8_EkVre4CyDQD1-kJE0d7MdWBep4IBZ3vaaNEl9ed1Ss/s640/vasyljevvv.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">On the left the 10400 mAh power bank. On top the HF preselector.</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjlQ01jthxVC9ob0xRf4oS36369iLwWfCygnyzIyrK-M_r6sLZqYRDcKuWBG7pTWHbbuQD-MAwU55TVCBWIWAT87Wgtat7zgQYQVXY9EXOLJY3MFUwit8ghiNq6LKjnJjx78Cw0e3yUaCw/s1600/vasyljevvvvv.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjlQ01jthxVC9ob0xRf4oS36369iLwWfCygnyzIyrK-M_r6sLZqYRDcKuWBG7pTWHbbuQD-MAwU55TVCBWIWAT87Wgtat7zgQYQVXY9EXOLJY3MFUwit8ghiNq6LKjnJjx78Cw0e3yUaCw/s640/vasyljevvvvv.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Preselector on top.</td></tr>
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-1275486919586858046.post-5933415676966941382016-05-11T03:02:00.000-07:002016-05-11T03:02:01.970-07:00First stage now finished. See pictures.<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">My double-SDR is now halfway finished: It is operational with the SDRplay only. After summer, I will add the next two modules, the AirSpy and some converter, either the Spyverter or the SV1AFN - have not decided yet.<br /><br />A picture tells more than 1000 words, so here is the story:</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIjkDC-Se_mp0eP1VyeAB911yUCFBtXj5hU99utjhqT0kI_Vcw7zmdLl5vGxiRm98DNxjEVQ0v_174EjPRklVklV34z-wyKZQgiw9bBL16uyNzXUiZ85jwDdoQ3prH-NuzRScHxSoCgwY/s1600/2J8A1472k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="425" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIjkDC-Se_mp0eP1VyeAB911yUCFBtXj5hU99utjhqT0kI_Vcw7zmdLl5vGxiRm98DNxjEVQ0v_174EjPRklVklV34z-wyKZQgiw9bBL16uyNzXUiZ85jwDdoQ3prH-NuzRScHxSoCgwY/s640/2J8A1472k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Testing indicator LEDs behind diffusor, enclosure not ready yet</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgT2olzcgCsseB1cr5_we3sRzC9YdBf747yqZbTSGl9WxO1jKyv4xtkjqYPc0CPqoLxJZDWv6z-5U7argkzWIzL8SNIHseij7Sn0e308StmqxPp1UJ3NQWEoR5gZCamBpVWGmk1F6Y0IAY/s1600/2J8A1614k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgT2olzcgCsseB1cr5_we3sRzC9YdBf747yqZbTSGl9WxO1jKyv4xtkjqYPc0CPqoLxJZDWv6z-5U7argkzWIzL8SNIHseij7Sn0e308StmqxPp1UJ3NQWEoR5gZCamBpVWGmk1F6Y0IAY/s640/2J8A1614k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Rubber feet</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSKlFjsTb1F7GT6Jbx0ctuXTsZYf1-CGjUl4fBiqjLybvdGY0JOVtNPc4fLSKx0WMETCmjLxZZWruqHauthyphenhyphendmRm5vIAfuI6A8idUB2B65c8dgPQvEjz08dOD13YVCJJqQ0VroY_Pch7E/s1600/IMG_6303k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSKlFjsTb1F7GT6Jbx0ctuXTsZYf1-CGjUl4fBiqjLybvdGY0JOVtNPc4fLSKx0WMETCmjLxZZWruqHauthyphenhyphendmRm5vIAfuI6A8idUB2B65c8dgPQvEjz08dOD13YVCJJqQ0VroY_Pch7E/s640/IMG_6303k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Velcro strip for SDRplay</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifXW2h8-lD5xDvMGcKuf5DEFvNZixhgmVvgP2PAoJYRQUEjyg3bLSzyjJjt-UFKPFnKELgBD8HadkXNtVUxBTT3dfY05A2CKhyphenhyphenYYcFpwmX91K5FS4pNB4qgWApUi4xh86bd8y3NFI9t4o/s1600/IMG_6304k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifXW2h8-lD5xDvMGcKuf5DEFvNZixhgmVvgP2PAoJYRQUEjyg3bLSzyjJjt-UFKPFnKELgBD8HadkXNtVUxBTT3dfY05A2CKhyphenhyphenYYcFpwmX91K5FS4pNB4qgWApUi4xh86bd8y3NFI9t4o/s640/IMG_6304k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Provisional sticker</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiL27aAoVPw_MJdiTtq4gxZhhfqjY2MrfoPl53Ly4s5U1sjij70JXEFU5Rjz-SuIn7JzQolNV5v85qgOeuEgsne4YiEaPrI1jbDCfhNrmzayai4ACStWhjGa4xS77OTEjitDGg6RBa6QH4/s1600/IMG_6305k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiL27aAoVPw_MJdiTtq4gxZhhfqjY2MrfoPl53Ly4s5U1sjij70JXEFU5Rjz-SuIn7JzQolNV5v85qgOeuEgsne4YiEaPrI1jbDCfhNrmzayai4ACStWhjGa4xS77OTEjitDGg6RBa6QH4/s640/IMG_6305k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Serious nuts & bolts</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGYPDzlqEZ7VwgzzbxLgW9kkthvkLcchN1HGGuUbIGg9MoCcpX3MaLtK03XpeKAyECGLmm1GET2-CO66MO-kpW1oz9kypmrDHSYonXVhyTTIysMFY5NgtR_hndpA3dR06v9ExqzlJnnSU/s1600/IMG_6315k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGYPDzlqEZ7VwgzzbxLgW9kkthvkLcchN1HGGuUbIGg9MoCcpX3MaLtK03XpeKAyECGLmm1GET2-CO66MO-kpW1oz9kypmrDHSYonXVhyTTIysMFY5NgtR_hndpA3dR06v9ExqzlJnnSU/s640/IMG_6315k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">USB cable is led into case without connector</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKRPN5zsvf_IQWSvFPM1L3_l-dbVZ6hpb-00Di3pNy4e8YpicanTUF9UOGXmMQbVxboHMcMS6RjdbOYQKr52HHxJ47eoxTt1C134kPiF8rw918K3sWqfc9Nii1zj6XCDnFq4fBWEHi8as/s1600/IMG_6318k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKRPN5zsvf_IQWSvFPM1L3_l-dbVZ6hpb-00Di3pNy4e8YpicanTUF9UOGXmMQbVxboHMcMS6RjdbOYQKr52HHxJ47eoxTt1C134kPiF8rw918K3sWqfc9Nii1zj6XCDnFq4fBWEHi8as/s640/IMG_6318k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Back panel, one RF-connector still missing (for HF converter input)</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggKzJKt3Mv3PHz3LH_Exo-1oVwcNrEpf20if3ac2pzv13PitIyQsF0RL_4Q3-AvPmYJIitqevUlaofGO-MfsLerM08T2xmuA-TbAsyOwHqIdDJ1IL3sdev6BxV1v7X2Qnh1KaNm6Wr1Mo/s1600/IMG_6321k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggKzJKt3Mv3PHz3LH_Exo-1oVwcNrEpf20if3ac2pzv13PitIyQsF0RL_4Q3-AvPmYJIitqevUlaofGO-MfsLerM08T2xmuA-TbAsyOwHqIdDJ1IL3sdev6BxV1v7X2Qnh1KaNm6Wr1Mo/s640/IMG_6321k.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Paper template to check if things will fit</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigHMxuzC4OTTT7aT_mXlx3F5PaxDePuHBIa9UG6VHJXhW0ejSs1BRPjCgZ5fj6h1I3XvGGCjzqvQvd2cReUTgYhNOY1r1QGl0s857oicHzmzpWghFlVW52s5Di1YagC-SXz5hvkJjpJEk/s1600/IMG_6330k.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigHMxuzC4OTTT7aT_mXlx3F5PaxDePuHBIa9UG6VHJXhW0ejSs1BRPjCgZ5fj6h1I3XvGGCjzqvQvd2cReUTgYhNOY1r1QGl0s857oicHzmzpWghFlVW52s5Di1YagC-SXz5hvkJjpJEk/s640/IMG_6330k.jpg" width="640" /></a></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><i>I will summarize the concept of my project once again. I consider the SDRplay and the AirSpy as modules, not as devices. I want to have two SDR's under one hood, so I can employ either receiver in the appropriate situation. No module can be fed by the USB host at all. There is a separate 13,8V input (batteries, linear power supplies) and a separate 5V input (cheap power banks).</i></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-1275486919586858046.post-88555923240582239922016-04-26T23:41:00.001-07:002016-04-27T08:20:01.605-07:00One Year Later: let's start building<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">After some "time consuming considerations" (one year!) about the logic around the RF modules, such as DC feed lines, switches, earthing, ground loops, common mode line chokes, decoupling C's, feed-throughs and much more, I finally started to assemble the enclosure that I designed earlier.</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW_GHLgT1hjfFG1nAz5_8iDiUvXd3nSY0bqPl9rnADTd90cMTOB7-u9Slx4YQip_CdhKXfRNnQs5bvICulG9skgqD4H_XQ5gM0BCVNig0BaDVfQDvt9Pw3419jN-_Em58P758fSq4qBFs/s1600/2016-04-26+16.18.02.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW_GHLgT1hjfFG1nAz5_8iDiUvXd3nSY0bqPl9rnADTd90cMTOB7-u9Slx4YQip_CdhKXfRNnQs5bvICulG9skgqD4H_XQ5gM0BCVNig0BaDVfQDvt9Pw3419jN-_Em58P758fSq4qBFs/s640/2016-04-26+16.18.02.jpg" width="640" /></span></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">The enclosure in a raw state - plastic protection, no panel holes yet. All </span><br />
<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Aluminium plates and profiles are 2 mm thick and all nuts and bolts are stainless steel.</span></td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">About logic: There will be one DC connector with 5 poles. Three different DC cords will be assembled. Of course, you can use one at a time, for different purposes. Cable 1 is for 12V DC sources. The 12 V DC will be lead to the internal linear 7805 converter. In this case, you can run either one of the receivers, or both simultaneously. Cable 2 is for 5 V DC sources which feed either one of the receivers - running two receivers is not enabled. Cable 3 is also for 5 V DC sources, but by short-cutting two poles of the chassis jack, running both receivers simultaneously is enabled. The latter is meant for using 5 V power supplies that are powerful enough to feed both receivers simultaneously.</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7123pcGAtLYPPa61PLHpclIBk9zN-nnBKd99UgDRFjCoUndnuIfwOfCCRUGgSkapCa-J1woexrmPV-edn9fXaqRphOZ4LMEpjDb6ya1D_Sf01T0BbDMEEsxKoyaHcBQeOS1OF1AjAksE/s1600/2016-04-27+08.30.04.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7123pcGAtLYPPa61PLHpclIBk9zN-nnBKd99UgDRFjCoUndnuIfwOfCCRUGgSkapCa-J1woexrmPV-edn9fXaqRphOZ4LMEpjDb6ya1D_Sf01T0BbDMEEsxKoyaHcBQeOS1OF1AjAksE/s640/2016-04-27+08.30.04.jpg" width="640" /></span></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Some switching and feeding logic</span></td></tr>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcbAd7OEu-OB5r2JiJpiXxRxX4Hu8zvfa4FdvM5uddoTa8HN1GJqMiomlQ12sAIiyUpdx4_kApEpcWgQH_K1vDXU7XA_m5a3slJc004y4XyIKMhbQNTFqV8pmdHwO5VoNreN3gh_q59_U/s1600/2016-04-27+08.30.12.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcbAd7OEu-OB5r2JiJpiXxRxX4Hu8zvfa4FdvM5uddoTa8HN1GJqMiomlQ12sAIiyUpdx4_kApEpcWgQH_K1vDXU7XA_m5a3slJc004y4XyIKMhbQNTFqV8pmdHwO5VoNreN3gh_q59_U/s640/2016-04-27+08.30.12.jpg" width="640" /></span></a></div>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">But as always: I may as well change everything while building the thing. And as long as it is a hobby project, everything is allowed!<br /><br />Next step will be: A copper plated epoxy carrier board will be placed onto the bottom plate of the enclosure; This will be the underlayment for all circuitry. This underlayment will be galvanically connected to the enclosure at one single earth point.</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEin6ErjxwCE9W9-Unart1AshDvjX6Y2PKv66vmPnzuoM_4zsj4Zwa94lPbpj4ealXg3mCLpqDEQwDgPz4WIN31Y3kljwZDfcWrFuW1M2iZmtTpQJHVadnjWLTeYMG99MqU44xvXlO2RAk0/s1600/IMG_6088.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEin6ErjxwCE9W9-Unart1AshDvjX6Y2PKv66vmPnzuoM_4zsj4Zwa94lPbpj4ealXg3mCLpqDEQwDgPz4WIN31Y3kljwZDfcWrFuW1M2iZmtTpQJHVadnjWLTeYMG99MqU44xvXlO2RAk0/s640/IMG_6088.JPG" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: Georgia, "Times New Roman", serif; font-size: large;">Some parts that I may need</span></td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizi2c-NMFYLBv6_VXyO1uOETLaM4D7U8KA6yVmehW7GHB9G-w8cR9ZOlOrK3BC4ivaLeagy832FZwDUVEpyEBaBb78FB5dRs9tGNH3icnLlcbJ4Mgz8eoq_ApKaAhgWX13AkAVIkbQykk/s1600/IMG_6085.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizi2c-NMFYLBv6_VXyO1uOETLaM4D7U8KA6yVmehW7GHB9G-w8cR9ZOlOrK3BC4ivaLeagy832FZwDUVEpyEBaBb78FB5dRs9tGNH3icnLlcbJ4Mgz8eoq_ApKaAhgWX13AkAVIkbQykk/s640/IMG_6085.JPG" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: Georgia, "Times New Roman", serif; font-size: large;">Waiting to be mounted...</span></td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg38FVXQdS328ob_cxtYXz3ejOLvRH5idWySxKtSpI_CILKv7uFSy66TcZQ6nRhIc81m8n35yRIohEG2IfrvQuGwHu93wbAtEr4iOpmYOROvTZCqhFRZ1NwACGYLq7c1kkccV9ziaYzw4k/s1600/2016-04-27+09.46.49.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg38FVXQdS328ob_cxtYXz3ejOLvRH5idWySxKtSpI_CILKv7uFSy66TcZQ6nRhIc81m8n35yRIohEG2IfrvQuGwHu93wbAtEr4iOpmYOROvTZCqhFRZ1NwACGYLq7c1kkccV9ziaYzw4k/s640/2016-04-27+09.46.49.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Panel cut-out sketches. Has changed a zillion times already.</span><br />
<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">And no boss who complains! Hobbies are a sanctuary.</span></td></tr>
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<br />Unknownnoreply@blogger.com4tag:blogger.com,1999:blog-1275486919586858046.post-54333198627688572612015-06-24T01:26:00.000-07:002015-06-25T04:12:54.882-07:00STAY 'TUNED'<span style="font-family: Georgia, Times New Roman, serif; font-size: large;">At this moment, various parts, kits and modules are on its way to me by mail. That will take some time. Furthermore, I don't have very much time for hobbies at the moment. So it will take some time before an update will appear here!</span><br />
<span style="font-size: large;"><span style="font-family: Georgia, Times New Roman, serif;"><br /></span>
<span style="font-family: Georgia, Times New Roman, serif;">As soon as there is something new to tell, I will let you know in the SDRplay FB group.</span></span><br />
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<br />Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-1275486919586858046.post-46919005734224758452015-06-22T09:46:00.003-07:002016-09-02T03:40:39.827-07:00INTRODUCTION AND GOALS<div class="MsoNormal">
<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><b>Building the Thing</b><br />This blog is entirely dedicated to one project: building both the Airspy SDR (and its future SpyVerter) and the SDRplay in one solid enclosure.</span><br />
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<b style="font-family: Georgia, 'Times New Roman', serif;"><span style="font-size: large;">Why two SDR's?</span></b><br />
<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">Every SDR has its idiosyncrasies. Building two in one case makes it a solid tool with enough hardware on board to fit different needs. And it offers an ultimate opportunity to compare the usability of both SDR's in the field.</span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><b>The main objectives are:</b></span></div>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">* <i>Powering the active devices from separate linear power supplies
and batteries, thus cutting the 5V USB lead; A 4 pole male XLR connector will be used as a DC receptacle;</i></span></div>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">* <i>Apply as much protection as possible against unwanted
signals such as USB noise and protecting against cables and leads that may work
as an antenna;</i><o:p></o:p></span><br />
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<span style="font-size: large;"><span style="font-family: "georgia" , "times new roman" , serif;">* </span><i style="font-family: Georgia, 'Times New Roman', serif;">Create a very solid and RF-tight enclosure that can
withstand intensive use in the field and leaves room for future hardware
extensions that need to be placed 'under the hood'.</i></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0pZgiRmCnWaA0EPZMIbNLDhYXieZDO9AJh0u-EKYt6Sh-mE3ZbY5lr2VkrUJjUzBB1t1pNgBb8fe4gGU4l2QWaOnQlyyBMFYJKMhaOLm_JRzg2JulKPIirj11TqLPA0FTsaW0VE3YpgA/s1600/IMG_1319.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0pZgiRmCnWaA0EPZMIbNLDhYXieZDO9AJh0u-EKYt6Sh-mE3ZbY5lr2VkrUJjUzBB1t1pNgBb8fe4gGU4l2QWaOnQlyyBMFYJKMhaOLm_JRzg2JulKPIirj11TqLPA0FTsaW0VE3YpgA/s400/IMG_1319.JPG" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">'Faraday Cupper Mesh' I picked up at the metal store. Destination still unknown.</td></tr>
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<b style="font-family: Georgia, 'Times New Roman', serif;"><span style="font-size: large;">The case</span></b><br />
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<span style="font-family: "georgia" , "times new roman" , serif;"><span style="font-size: large;">Earlier I crawled the whole internet for readily available commercial
enclosures but none of them fitted my
needs. So I decided to design my own.</span><o:p></o:p></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXnvKYyGjsGg2hhOWHbxXPMG5dG6_GxCln0qs5tb0qo75jkeizkUE7KIBEY3ClCrvMKX0YRk8BR1teEkId-CGPb6nlq_LWjSAuS2f18dAedfVAV5bC1UnoIZ9iPjLqtJ-vyGo9-1BUtpA/s1600/IMG_1304.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXnvKYyGjsGg2hhOWHbxXPMG5dG6_GxCln0qs5tb0qo75jkeizkUE7KIBEY3ClCrvMKX0YRk8BR1teEkId-CGPb6nlq_LWjSAuS2f18dAedfVAV5bC1UnoIZ9iPjLqtJ-vyGo9-1BUtpA/s400/IMG_1304.JPG" width="400" /></a></div>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><i>The design…</i><o:p></o:p></span></div>
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<i><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">…includes a lot of
room for the units, sidekick devices and possible future extensions;</span></i></div>
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<span style="font-size: large;"><i><span style="font-family: "georgia" , "times new roman" , serif;">…is made of aluminium plate, thickness 2mm and aluminium
profiles, angled ½</span></i><b style="background-color: white; color: #252525; font-family: sans-serif; line-height: 22.39px;"><span class="polytonic" lang="grc" style="font-family: "athena" , "gentium" , "gentium plus" , "gentium alt" , "palatino linotype" , "dejavu sans" , "arial unicode ms" , "lucida sans unicode" , "lucida grande" , "code2000";" xml:lang="grc">π</span></b><i><span style="font-family: "georgia" , "times new roman" , serif;">, sides of 20mm, thickness 2mm;</span></i></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj24KhOHeIk8RzyVA7_9RLT17Vil_zkP1eEicpT4IF9sMnUmCRglPWKjCge6F2IFa6PAr_9T-tdo05pANwRzwrAyXSjhRHUlV7OZUoacotw7FKAPTQgKC9InZnG98qW29YMM_CIJNm7L5M/s1600/IMG_1311.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj24KhOHeIk8RzyVA7_9RLT17Vil_zkP1eEicpT4IF9sMnUmCRglPWKjCge6F2IFa6PAr_9T-tdo05pANwRzwrAyXSjhRHUlV7OZUoacotw7FKAPTQgKC9InZnG98qW29YMM_CIJNm7L5M/s400/IMG_1311.JPG" width="400" /></a></div>
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<i style="font-family: Georgia, 'Times New Roman', serif;"><span style="font-size: large;">…will be kept together by stainless steel hexagonal screws and NOT by pegs;</span></i></div>
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<i style="font-family: Georgia, 'Times New Roman', serif;"><span style="font-size: large;">…provides easy access to all areas in the case;</span></i></div>
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<span style="font-family: "georgia" , "times new roman" , serif;"><i><br /></i></span><span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><i>...includes an inside area of which the dimensions form a golden rectangle.</i></span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;"><b>Fake branding</b></span></div>
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">In my country, the frequency domain for wireless microphones is rapidly shrinking because these domains are conquered by 4G networks. Soon I will offer on-location RF surveys and advice production companies (TV and live entertainment) which frequencies are vacant for solid wireless connections.</span><br />
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<span style="font-family: "georgia" , "times new roman" , serif; font-size: large;">But I don't want them to look over my shoulder and steal the trick. So I will provide the case with a Russian brand name and model designator, such as 'Vasyljev XTR-320'. Googling this will end up in nothing and nowhere. Or <em>herewhere</em>.</span></div>
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<span style="font-size: large;"><span style="font-family: "georgia" , "times new roman" , serif;"><b>[Update:] More secret whys</b></span></span><br />
<span style="font-size: large;"><span style="font-family: "georgia" , "times new roman" , serif;">There are actually a few more reasons than the ones mentioned above. I love craftmanship. I love ruggedized equipment, as I often see in rude environments such as oil and gas production sites and platforms. I love the fun of fake branding. I love to have choices: either switch on SDRplay or AirSpy mini.</span></span><br />
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<span style="font-size: large;"><span style="font-family: "georgia" , "times new roman" , serif;"><i><br /></i></span><span style="font-family: "times" , "times new roman" , serif;"><i><b>WILL BE CONTINUED HERE!</b></i></span></span></div>
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