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Re: [Amps] Alpha 77 start up

To: Jim W7RY <>,
Subject: Re: [Amps] Alpha 77 start up
From: Jan Ditzian <>
Date: Sun, 20 Mar 2011 15:03:58 -0400
List-post: <">>
I removed the old vacuum relay and put in a new (used) one.  Now the 
exciter sees the antenna or dummy load at the output.  That is the good 

I have an external swr/wattmeter, and it shows 1:1 on the dummy load 
with the exciter (Ten-Tec Omni VI) through the amp.  This holds when the 
amp is in Standby or Off.

When I look at the amp multimeter, the forward power is very low, and 
the reverse power is much higher, on the meter.  I then returned the 
exciter to zero power and switched the amp to CW position.  The CW light 
lit, so the delay seems to be working OK.  However, when I turned up the 
power, the grid and plate meters did not show anything.

I repeated this while looking at the external swr/wattmeter.  In Standby 
position, the meter shows exciter output, but in CW position there no 
longer seems to be any output.  If I look at the meters on the exciter, 
it looks like there is high swr at the exciter when the rig is in CW mode.

I watched the ALC light and it never lights, but I am not using ALC from 
the exciter.

I think that the above test indicates that I either did not successfully 
wire the relay, or there is a related problem.  Is there a way for me to 
verify whether or not the relay is working?

Thank you,

Jan, KX2A

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