<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dave,<div class=""><br class=""></div><div class="">300W is too much for SMA connectors on the relays, so I doubt the contacts can handle it either. Tech data I’ve seen on the SMA connectors themselves says 100W up to 18G. I don’t know the part number of your relay, but I think they could handle in the 50W range.</div><div class=""><br class=""></div><div class="">N connectors are rated up to 350W at 18G, I’m not sure how much at 900MHz. I’ll send you a document I have on this.</div><div class=""><div class="">
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<br class=""><div><blockquote type="cite" class=""><div class="">On Aug 30, 2016, at 11:54 PM, David Pruett <<a href="mailto:k8cc@comcast.net" class="">k8cc@comcast.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">MIVUSers:<br class=""><br class="">I am hoping that someone here on the reflector can offer some advice concerning the power ratings for SMA coaxial relays at 902 MHz.<br class=""><br class="">A couple of months ago I bought some 902 MHz gear from a guy out in New York who was part of a mountain topping group. I got a 10W DEMI transverter, one of the 300W Motorola 900 MHz cell phone amps, a DEMI LNA in a weatherproof box with switching relays, and a 900 MHz receive bandpass filter<br class=""><br class="">There are two SMA relays in the weatherproof box; one switches the antenna between the transmit and receive signal paths, while the other switches the LNA input to a dummy load when not receiving (e.g., when transmitting or when the power to the box is OFF).<br class=""><br class="">I'm concerned about the antenna relay, which would carry the output of the Motorola amp during transmit (somewhere between 200-300W depending on which conversion article you believe).<br class=""><br class="">I'd appreciate any advice as to whether I should to upgrade this relay. Meanwhile, I've also e-mailed the guy I purchased the gear from to confirm whether they ran the amp with the remote preamp box. I plan to run a sequencer, so the relay shouldn't experience "hot-switching".<br class=""><br class="">Thanks in advance for any advice. I hope to have this stuff running in time for the September VHF QSO Party.<br class=""><br class="">73, Dave/K8CC<br class="">EN82eh<br class=""><br class=""><br class="">_______________________________________________<br class="">MiVUS mailing list<br class=""><a href="mailto:MiVUS@mivus.org" class="">MiVUS@mivus.org</a><br class="">subscribe/unsubscribe http://mail.mivus.org/mailman/listinfo/mivus_mivus.org<br class=""></div></div></blockquote></div><br class=""></div></body></html>