[Mich VHF UHF Society] Power rating for SMA relays?
David DeVos
kf8ql at yahoo.com
Wed Aug 31 06:04:10 CDT 2016
Dave,
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.
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.
David DeVos - KF8QL
www.davedevos.com <http://www.davedevos.com/>
www.mythinplace.com <http://www.mythinplace.com/>
616-706-8736
> On Aug 30, 2016, at 11:54 PM, David Pruett <k8cc at comcast.net> wrote:
>
> MIVUSers:
>
> I am hoping that someone here on the reflector can offer some advice concerning the power ratings for SMA coaxial relays at 902 MHz.
>
> 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
>
> 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).
>
> 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).
>
> 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".
>
> Thanks in advance for any advice. I hope to have this stuff running in time for the September VHF QSO Party.
>
> 73, Dave/K8CC
> EN82eh
>
>
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