SDRplay Community Forum

Forgive me for wading in, no doubt Ian is very well intentioned and trying to be helpful, but as sdrom33 says the article is so problematic that it seems to be useful example of what not to do and anyway I love antennas so much I can't help myself. It seems (to me anyway) that the concept is flawed ...

Hi Gianfranco, enjoy that magnificent holiday!

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For anyone following the WSPR tests a software problem took down VK7JJ3 last night and there are other issues as well.

More later, Phil

The winner of the WSPR 30m first round shootout is the FT-857D Both radios achieved 88 total unique callsigns heard over a 24 hour UTC period. The win was thus decided on the basis of extra spots from the same stations being received by the 857 that the 991 missed rather than new stations being hear...

That's a pretty good question Gianfranco! A core i5 refurb with a decent screen where we live is closer to $400 and then you start thinking it's 5400rpm snaildrive needs replacing with an SSD, and a new Pi4 is $60 but that's not the real story. I've got two remote Pi running irrigation pump, waterin...

Hi Gianfranco, as you might guess I just crossed posts with you, will catch up a bit later!

Regards, Phil

Sorry about failing to respond to your crystal offer and thanks for mentioning it. As per earlier comments I have tried using a single crystal. Given that the WSPR sub bands are 200Hz wide a single crystal has exactly the right bandwidth at around 500Hz according to my tests on 40m and 10m crystals ...

Forgive me, badly expressed. I need to vary the inter-coil coupling using my first sliding coils and experiment with the trade off of insertion loss against selectivity. eg. in the last hour I've received 21 stations on 30m WSPR with the SNRs as below: -27, -26, -25, -25, -25, -24, -24, -24, -24, -2...

Well done and looking good Gianfranco. No further construction progress here, been setting up a Pi on WSPR (but it's only a 2B and groaning under the load) so as to free up the Windows VM for better testing, plus I'm on a short leash doing chores. The current preselector arrangement as posted using ...

Order is in and waiting on stock he said enviously.

A rural location? Great to use larger simple wire antennae and really benefit from your likely lower noise level. Given your original question went to the point of precise antenna geometry, my own approach is based on "perfect is the enemy of good", attributed to Voltaire among others though in my c...