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Re: [Amps] How to Bypass TR circuitry in Alpha 86

Subject: Re: [Amps] How to Bypass TR circuitry in Alpha 86
From: Mark - N5OT <>
Date: Thu, 13 Feb 2020 06:03:59 -0600
List-post: <>
An Icom 746 PRO.  Conventional transceiver.  Same radio, same amp, since 2005.

Mark N5OT

On 2/11/2020 5:26 PM, Jim wrote:
What are you driving it with?

Jim W7RY

On 2/11/2020 12:02 PM, Mark - N5OT wrote:
Hello Power People,

I have an Alpha 86 where something has failed resulting in a fault.  Since this failure mode began very shortly after the amp received the newer and stouter PIN diodes, and the amp was not subjected to excessive abuse, I believe the control circuitry itself may be wonky. I would like to take my chances, bypass the internal TR circuitry and also the control circuitry, and use an external TR switch I have on the shelf (Ameritron QSK-5).

Unfortunately 100% of the time at the first dit the control circuitry bounces the amp out of transmit mode rendering it unusable.  I would like it to stop doing that.  I fully understand the risks and am willing to take them.


73 - Mark N5OT

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