[Amps] Noisy relay

[MU 4CX250B]

Steve, you might be hearing the induced voltage kick caused by the
inductance of the coil. Try putting a clamping diode. A small signal
diode like a 1n914 will work fine,
73,
Jim w8zr


Sent from my iPhone

> On Dec 11, 2022, at 9:39 AM, Steve London <n2icarrl at gmail.com> wrote:
>
> Commander HF-2500..
>
> Every time the T/R relay goes back to receive, I'm getting a pretty big RF
> spike that I can hear in the receiver. This has nothing to do with the
> transceiver hot switching or RF stored in the tank circuit. I can reproduce
> it just by cycling the T/R relay in the amp with a separate cable, not
> connected to the transceiver, and not transmitting.
>
> Suggestions ?
>
> 73,
> Steve, N2IC
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