[Mich VHF UHF Society] Power rating for SMA relays?

[David DeVos]

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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