Many amps used open frame relays with 10-13A contacts and they worked well
at 1500W. The one issue with them is high VSWR in the thru position on 10M
which can fold back the power in a SS rig. The cure is simple, add a
capacitor from the thru loop to ground to tune out the Xl.
You can use an adjustable mica trimmer and leave it or measure the value and
replace with a 1KV disc ceramic or 500V mica. Typical values are 25-35 pf.
Any one will handle 100W with ease.
----- Original Message -----
From: "Steve Flood" <email@example.com>
Sent: Saturday, March 29, 2008 11:54 AM
Subject: [Amps] open frame relay rating
>I have several open-frame relays. If I use one for the T/R relay, what
>should the contact rating be for a 1500w amp? Is it as simple as 1500w /
>50 ohms = SQRT of 30A or 5.5 Amps?
> Steve, KK7UV
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