Hi Dave, thanks for the suggestion. I tried doing a quick measure using a cross-needle SWR meter today, using the lowest setting. On 40m the power appears to just deflect the needle, well below the 0.5W mark. Probably I could say less than 250mW, maybe 100mW. I usually have an external relay in a box to disconnect the RX antennas while transmitting, but not today. I was thinking why the RX antennas remain connected when transmitting if there's not another use in a typical single-op station.
Thanks, Ciao Fabio IZ4AFW / IO4W / NZ1W Il 04.03.2017 13:12, David Olean ha scritto: > Hello Fabio > > I have two beverages that are somewhat close to my TX antenna. One > had about 75 mw on it during TX while beverage #2 had about 1 watt! This > is enough power to cause damage to preamps, so I made two power limiters > and now the inputs are clipped at about 0 dBm. All it took was two > transformers and two diodes in a box. Do you know what the power level > is on your beverage during transmit periods? Really high power levels > could burn up the transformers. Disconnecting the antenna is a good > idea too. > > Dave K1WHS > > > On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote: >> Hi guys, >> I was thinking of a possible firmware improvement related to the >> carrier operated relay. >> I use my radio on a small lot and recently I added a short beverage >> antenna for low-bands receiving. My main activity is single-op >> contesting. >> Because of the interaction between the tx antennas and the beverage, on >> some bands I have the COR (carrier operated relay) activating when I use >> high power. >> I know the good solutions, but my point is different. >> As I have the COR activating only when the RX Ant input is selected, why >> doesn't the K3 firmware disable it when pushing the ptt? >> >> In fact, when I push the ptt I don't need the RX-ant part to be active, >> as I'm transmitting, and -at least in my setup- I have no other >> rigs/devices that need that input (I mean, no in-band receivers and so >> on). >> Instead of using external relays (ptt-activated) that cut out the rx >> input when I am transmitting, why the K3 firmware just doesn't disable >> the RX ant input on its own (and re-enables it if needed when releasing >> the ptt)? >> Maybe I'm missing something here, or that could be a nice improvement >> for a next firmware release. >> >> Thanks for any comment, >> Ciao 73 >> Fabio >> IZ4AFW / IO4W / NZ1W >> >> >> --- >> Questa e-mail è stata controllata per individuare virus con Avast >> antivirus. >> https://www.avast.com/antivirus >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to k1...@metrocast.net >> > --- Questa e-mail è stata controllata per individuare virus con Avast antivirus. https://www.avast.com/antivirus ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
