Hi John: yes, easily on the lower freq. I have used power relays for antenna switching on 80 and 40 meters, that said, it is a low impedance(50 and 75 Ohms) and power in excess of 1200 watts carrier. the relays I used are the standard guys about 1.5 x 1.5 x 2.25 or so with a clear plastic case. 3 PDT. do not switch under power. do not use for hi z as the voltage could be practically anything. if you compare the contact size with the old dedicated antenna relays you will find contacts are larger, silver coated contacts are desirable for receive use and it would not hurt to use a set of contacts to ground the rx antenna term on transmit. I think all of these guys are silver plated. The only problem I have had is in winter, outside, they tend to get moisture in them and frost occures causing them to be a little sluggish. a small resister in a box with them would probably stop that. I also have some open frame relays that I use for plate xformer primary power switching. they are double pole single throw and have a large gap when open, they would be satisfactory for open wire feeder. I do not think there would be an issue up to 10 meters, above that there might be a impedance bump that could be an issue... all of these are available on ebay rather cheap. I tend to go with the DC relays as it becomes so easy to add a delay with just a fat cap across them. you should have seen what happined to a Dow Key relay when the AC power quivered one time. another nice aspect of DC is that you can switch two different relays with only two wires and two diodes + for one and - for the other relay. you can even use the coax and feed DC into and out with chokes. They are not going to work with break in but if you are here, I do not think that is an issue, Bernie W8RPW ----- Original Message ----- From: "John King" <k5...@yahoo.com> To: <amradio@mailman.qth.net> Sent: Monday, December 14, 2009 10:45 PM Subject: [AMRadio] Relay rating
> Will 10 amp rated contacts on a relay handle 300 watts of carrier from an > AM transmitter? Your opinion based upon your experience will be > appreciated. Thanks and 73, John, K5PGW > > > > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
