[Amps] Alpha 87A Mic Click Grid Current Spike

[David Cutter]

I've heard that some transceivers produce a high power leading edge which 
particularly Alphas with protection circuitry don't like.  IC706 comes to 
mind, I dare say others, too.

David
G3UNA


----- Original Message ----- 
From: "Paul Christensen" <w9ac at arrl.net>
To: "JOS Earthlink" <jsternmd at earthlink.net>; "Amps Amps" 
<amps at contesting.com>
Sent: Thursday, November 08, 2007 11:29 PM
Subject: Re: [Amps] Alpha 87A Mic Click Grid Current Spike


>> Just noticed that when I PTT on my mic that my Alpha 87A Grid current
>> always
>> shows a momentary spike of about 70ma.
>
> Start by taking the transceiver RF out of the equation.  Remove only the
> coaxial cable between the 87A and transceiver.and key the amp's PTT line
> with the transceiver.  Even better, bypass the transceiver altogether and
> key the amp's PTT line with a dry contact closure.  If the grid current no
> longer spikes, then the transceiver may be producing a short burst of high
> power even with negligible drive.
>
> Paul, W9AC
>
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