I am home brewing a coax switch for the shack. I want it to handle 1500 watts of power, but not to "hot" switch. I am looking at PCB relays and found many that handle 10 amps, but only a few that spe
1500 watts into 50 ohms = 274 volts rms if the line is flat. Current would be 5.5 amps, again if the line is flat. 73 Gary _______________________________________________ See: http://www.mscomputer.c
The type of amp has nothing to do with it. Just calculate the max peak voltage for 1500w in 50ohm coax with whatever the highest swr you expect to handle would be.... then add a safety factor. David
Keith: April QST show a remote ant switch, take a lot at the relays Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. __________________
to handle 1500 PCB relays and specify a high expected out of a Keith, Having been involved in this since the 80's, my advice would be to NOT use DC or LF amperes, and you actually can't use DC or LF
What impedance is your system? 2000Wrms (just to give a bit of margin) into 50 ohms is about 316Vrms, call it 450V peak. 2:1 voltage margin is typical as a design requirement. However, if you, for in
Tom has raised a number of important issues for relay selection .... I collected all the relay posts from a few years at http://home.earthlink.net/~w6rmk/relay.htm There's also the relays used inside
I have quite a few relays .. most are 24/26v dc, open-frame with heavy contacts. Let me know if I can help you. Don N8DE _______________________________________________ See: http://www.mscomputer.com
I built a remote antenna relay box 9 years ago using Radio Shack DPDT relays with contacts rated at 10 amps (I paralled the contacts). Works fine and running full power. Drove the 2KD-3 at 150 watts
Tom, Thanks for the tips. I particularly like the design of the RCS-8V box. Those are custom made relays from Relay Service Company. I called wanting them to make some for me but the small quantity c
Thanks to all who have offered advice. I just finished reading the QST article by Bill Smith KO4NR. Think I will purchase a few of his recommended Zettler relays and dismantle them for close inspecti
the RCS-8V box. I called wanting too high. Looks and VSWR through I actually made a prototype relay and sent it to RSC, and they copied it for Ameritron for production. That was about 1983 or 1984.
Although I have built my own antenna relays (I recently did a 4-way that's at the tower base), take a look at: http://www.qth.com/topten/sixway.htm I have two of these in the shack replacing the olde
Find out what relays are used in the WX0B (www.arraysolutions.com) stackmaster boxes that are used to switch various combinations of stacked HF beams. I don't think those relays are particularly exot
Except the RR8 by DXE has eight ports, handles power >3KW RTTY (on ten meters) , and has better SWR (better than 1.2:1 on six meters) and port isolation (64dB worse case on SIX meters). ;-) 73 Tom _
Aha! So you're the one who designed that monster. When I saw it I knew it had likely been designed by an RF engineer because the contacts are massive and located very close to the PCB solder point. A