Search found 290 matches
- Sun Jul 13, 2025 8:54 pm
- Forum: Questions & Advice
- Topic: WSPRSONDE
- Replies: 0
- Views: 525
WSPRSONDE
Wanna help with WSPR and propagation research ? If so, please, have a look here https://turnislandsystems.com/host-a-hamsci-wsprsonde-also-turn-island-systems-in-qst/ "The HamSCI package will include the WSPRSONDE, a 9-Band Filter-Combiner, a Bodnar GPSDO, an 80-10 meter end-fed halfwave antenn...
- Wed Jun 25, 2025 7:32 pm
- Forum: Questions & Advice
- Topic: Svalbaard islands activation
- Replies: 1
- Views: 42315
Re: Svalbaard islands activation
worth a try 

- Wed Jun 25, 2025 7:27 pm
- Forum: Questions & Advice
- Topic: Svalbaard islands activation
- Replies: 1
- Views: 42315
Svalbaard islands activation
next July
https://www.mdxc.support/jw0v/
Vlad OK2WX, will be active as jw0v from Svalbard from 14 to 23 july 2025, 160-6 m, CW/SSB/FT8. QSL via I8KHC
https://www.mdxc.support/jw0v/
Vlad OK2WX, will be active as jw0v from Svalbard from 14 to 23 july 2025, 160-6 m, CW/SSB/FT8. QSL via I8KHC
- Fri May 16, 2025 8:10 am
- Forum: Questions & Advice
- Topic: HOA antenna
- Replies: 0
- Views: 10530
HOA antenna
in practice it's invisible and. being a loop. it also helps taming the QRM https://www.kk5jy.net/porch-loop/ if one doesn' t feel comfortable in winding the voltage BalUn, the NooElec 9:1 v2 will fit, just ensure to use low loss coax (e.g. RG6, avoid the RG58 !) and add 10 or more snap on ferrite ri...
- Thu May 01, 2025 2:11 pm
- Forum: Questions & Advice
- Topic: RF building blocks
- Replies: 3
- Views: 36752
Re: RF building blocks
then one may add some filters https://gpio.com/collections/notch-filters between the antenna and the LNA in EU or at Least in Italy one may want this https://gpio.com/collections/notch-filters/products/fm-notch-filter-88-108mhz-excellent-rejection-85db to keep commercial FM from.saturating the LNA a...
- Sun Apr 27, 2025 4:23 pm
- Forum: General Discussion
- Topic: Another directional RX loop
- Replies: 17
- Views: 560561
- Wed Apr 23, 2025 8:28 pm
- Forum: Questions & Advice
- Topic: RF building blocks
- Replies: 3
- Views: 36752
Re: RF building blocks
an example
https://gpio.com/collections/low-noise- ... -30db-gain
the LNA above should fit pretty well the SULA loop
https://gpio.com/collections/low-noise- ... -30db-gain
the LNA above should fit pretty well the SULA loop
- Wed Apr 02, 2025 1:23 pm
- Forum: Questions & Advice
- Topic: RF building blocks
- Replies: 3
- Views: 36752
RF building blocks
Preamplifiers (LNAs), low/high/bandpass/notch filters, Bias-T units and other RF "building blocks"
https://gpio.com/
HTH
https://gpio.com/
HTH
- Fri Mar 21, 2025 10:08 pm
- Forum: Questions & Advice
- Topic: Maximize dipole performance
- Replies: 1
- Views: 36263
- Tue Mar 18, 2025 8:46 pm
- Forum: Questions & Advice
- Topic: Maximize dipole performance
- Replies: 1
- Views: 36263
Maximize dipole performance
Also applies to other horizontally polarized antennas
https://www.voacap.com/2023/antennas/sq ... of-dipole/
https://www.voacap.com/2023/antennas/sq ... of-dipole/