SWLing Post Message Board

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...

worth a try

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

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...

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...

13dka wrote: ↑Sun Apr 27, 2025 8:46 am Can't wait to make and try one of those! (Will take a while tho.)

tried it, works as described, less gain than the SULA but much easier to carry around and for permanent setups more resistant to winds

an example

https://gpio.com/collections/low-noise- ... -30db-gain

the LNA above should fit pretty well the SULA loop

Preamplifiers (LNAs), low/high/bandpass/notch filters, Bias-T units and other RF "building blocks"

https://gpio.com/

HTH

https://practicalantennas.com/designs/v ... s/5eights/

and the above deals with vertical antennas

Also applies to other horizontally polarized antennas

https://www.voacap.com/2023/antennas/sq ... of-dipole/