Hi Chris I dont think the relay type is too significant at these frequencies. The important thing is its contacts should be able to carry the current. It is at a low impedance point so the voltages s
Alan - You're forgetting the loading coil has to be switched out when using the loop at HF, so the relay has to withstand the full RF voltage when using it as a vertical at LF/MF. So you'll need
Hi Andy Surely the voltage will not appear across the contacts, though I agree contacts to activating coil might be a problem. Yes reeds area problem because I think of the reed material. I only used
Hi Andy Surely the voltage will not appear across the contacts, though I agree contacts to activating coil might be a problem. Yes reeds area problem because I think of the reed material. I only u
Chris, Yes, HV relays for DC or 50 Hz may not work properly: https://www.youtube.com/watch?v=hIkNY5xjy5k 73, Stefan Am 19.11.2015 13:44, schrieb Andy Talbot: Alan - You're forgetting the loading coi
Hey LFers, what's about a russian Antenna-Switch (former used in R140 Stations)? 73 Vinny DL6II Am 19.11.2015 15:17, schrieb DK7FC: Chris, Yes, HV relays for DC or 50 Hz may not work properly: https:
Hello Vincent, Thursday, November 19, 2015 That looks a hefty beast, never seen one though. I do have a R140 amp in the loft, awaiting power supply and control board completion. I might e-mail the Po
Hi Chris, I would assume such a large HV switch and the whole construction adds a few 10 pF to your system. This C has of course no radiation resistance. So this lowers your antenna efficiency a bit!
Hello Stefan, I am not sure a (lossless) capacitor in parallel with the coil will lower the antenna efficiency. I would assume that it will affect the antenna impedance as seen from the TX, but will
Hello Rik, Thursday, November 19, 2015 Whilst you experts argue the technical niceties of the challenge, let me ask what might be a simple question to you guys. What is the minimum number of two cont
Hello Andy, Thursday, November 19, 2015 Thanks Andy, I have just put my coat and boots by the door <LOL> -- Best regards, Chris 2E0ILY mailto:[email protected]
Hello Graham, Thursday, November 19, 2015 Probably, but my loop works very well on HF, would be sad to lose it to just LF usage. If I had to run dual antennas I would probably keep the loop as HF and
This one is quite handy but not suitable for several kV. They do seem to be expensive but I have 3. Hugh M0DSZ Hi Andy and Genossen LFers! The hi-voltage relays problem will be solved by serially
Hello Hugh, Saturday, November 21, 2015 Thanks for the details of the small relay. I think, in view of the number of relays i would need, the voltages involved, and the price of the things I may have
