Search found 206 matches
- Thu Jul 04, 2019 10:25 am
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
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 ...
- Tue Jul 02, 2019 11:54 pm
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
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
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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
- Mon Jul 01, 2019 10:17 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
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...
- Sun Jun 30, 2019 6:57 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
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...
- Sat Jun 29, 2019 7:00 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
Hi Gianfranco, as you might guess I just crossed posts with you, will catch up a bit later!
Regards, Phil
Regards, Phil
- Sat Jun 29, 2019 6:59 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
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 ...
- Fri Jun 28, 2019 9:51 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
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...
- Fri Jun 28, 2019 8:08 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498212
Re: Receive Antenna & Impedance "Matching"
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 ...
- Fri Jun 28, 2019 7:55 am
- Forum: General
- Topic: Raspberry Pi4B
- Replies: 6
- Views: 25164
Re: Raspberry Pi4B
Order is in and waiting on stock he said enviously.
- Mon Jun 24, 2019 12:38 am
- Forum: New Users' experiences
- Topic: Best antenna no good signals?
- Replies: 21
- Views: 150694
Re: Best antenna no good signals?
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...