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Re: [Amps] Closure on the Vacuum Relays, Plus...

Subject: Re: [Amps] Closure on the Vacuum Relays, Plus...
From: Larry Benko <>
Date: Fri, 12 Dec 2008 12:49:20 -0700
List-post: <">>

My Acom amp also will not drop the RF relay if RF is present.

73, Larry  W0QE

Jim Brown wrote:
> On Thu, 11 Dec 2008 18:25:10 -0600, Phil & Debbie Salas wrote:
>> I've found that there are several transceivers that disable the amplifier 
>> well before the RF output has decayed to zero, which causes hot-switching of 
>> the transceiver output.  
> The TenTec Titan 425 has circuitry that senses RF input and won't let T/R 
> relay drop until RF input has gone away. This prevents hot switching of the 
> T/R relay in the power amp in this situation. This works entirely within the 
> Titan, and is independent of how the amp is keyed. That is, you can try to 
> switch the Titan out of transmit with the front panel Standby/Transmit 
> switch, and it will keep on transmitting as long as there's RF drive. 
> I suspect that other Ten Tec amps do the same. 
> 73,
> Jim K9YC
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