<div>Seems hard to believe but I see them online advertised as being good at legal limit. <br/>
<br/>
Never used SMA here however. <br/>
<br/>
Good luck<br/>
<br/>
Ken - KU8Y<br/>
<font color="#888888"><font color="#888888">Sent from my android device.</font></font><br/><br/>-----Original Message-----<br/>From: David Pruett <k8cc@comcast.net><br/>To: MiVUS@mivus.org<br/>Sent: Tue, 30 Aug 2016 11:50 PM<br/>Subject: [Mich VHF UHF Society] Power rating for SMA relays?<br/><br/></div>MIVUSers:
<br/>
<br/>
I am hoping that someone here on the reflector can offer some advice
<br/>
concerning the power ratings for SMA coaxial relays at 902 MHz.
<br/>
<br/>
A couple of months ago I bought some 902 MHz gear from a guy out in New
<br/>
York who was part of a mountain topping group. I got a 10W DEMI
<br/>
transverter, one of the 300W Motorola 900 MHz cell phone amps, a DEMI
<br/>
LNA in a weatherproof box with switching relays, and a 900 MHz receive
<br/>
bandpass filter
<br/>
<br/>
There are two SMA relays in the weatherproof box; one switches the
<br/>
antenna between the transmit and receive signal paths, while the other
<br/>
switches the LNA input to a dummy load when not receiving (e.g., when
<br/>
transmitting or when the power to the box is OFF).
<br/>
<br/>
I'm concerned about the antenna relay, which would carry the output of
<br/>
the Motorola amp during transmit (somewhere between 200-300W depending
<br/>
on which conversion article you believe).
<br/>
<br/>
I'd appreciate any advice as to whether I should to upgrade this relay.
<br/>
Meanwhile, I've also e-mailed the guy I purchased the gear from to
<br/>
confirm whether they ran the amp with the remote preamp box. I plan to
<br/>
run a sequencer, so the relay shouldn't experience "hot-switching".
<br/>
<br/>
Thanks in advance for any advice. I hope to have this stuff running in
<br/>
time for the September VHF QSO Party.
<br/>
<br/>
73, Dave/K8CC
<br/>
EN82eh
<br/>
<br/>
<br/>
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