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@arrl.net>
To: "JOS Earthlink" <jsternmd@earthlink.net>; "Amps Amps"
<amps@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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