I went a different route. I made a simple patch panel. It was
easy because I used bulkhead connectors for input, output, and relay so no
soldering, just cables on each side. Relays are RCA, inputs are BNC and
outputs are quick change SO-239. (available from Amazon and have handled
legal limit just fine for years. No way to make a dangerous connection and
takes less than 30 seconds to change. Picture on request. I use it to
switch my ALS-1306 and my legal limit Henry.
Dave W7VM
On Sat, Apr 3, 2021 at 10:59 AM Jim Thomson <jim.thom@telus.net> wrote:
> Date: Sat, 3 Apr 2021 12:54:29 +0000 (UTC)
> From: Dick NY1E <dick@ny1e.com>
> To: "amps@contesting.com" <amps@contesting.com>
> Subject: [Amps] Switching between two amplifiers
>
> <I want to? switch between using my homebrew amp or a TL-922A, I could use
> a pair of coax switches, but would like a single knob to eliminate operator
> error! What are others using to do this? de Dick NY1E
>
> ## I wire the amps nose to tail...in series. BUT that requires the
> TR relays in both amps to be able to handle full power..on bypass mode.
>
> ## I have wired as many as 4 x drake L4Bs in series. Key line from
> xcvr goes to the common of a small rotary switch. ...then a key line cable
> to each amp. Every 2nd position on the rotary switch is for an amp. The
> un used positions
> on the rotary switch are for bypass, aka standby positions. Its a
> simple mech interlock, that ensures only ONE amp can be keyed at one time.
> Then tune up the various amps for cw and ssb on same band, or 4 x
> different bands,
> or any combo u can think of.
>
> ## Same deal on the HB amps that use vac relays.
>
> Jim VE7RF
>
>
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