[Heathkit] I Need information on SB-401 transmitters

[mparkinson1]

----- Original Message -----
From: "mparkinson1" <mparkinson1 at socal.rr.com>
To: <heathkit at mailman.qth.net>
Sent: Monday, August 30, 2004 6:20 PM
Subject: Re: [Heathkit] Need schematic for IP-2715
 This is a second posting because I forgot to clean up the subject line
sorry about that.

> OK who is the expert on the SB-401 transmitter.
> I have gotten several of  them and they all seem to have the same problem.
> If you load up on a dummy load and it puts out 100ws great.
> When I switch to the ALC mode the meter pegs over to the right and when I
> key the mic the meter moves all the way over and pegs to the left side.
> What is up with that?
> Also when checking for the modulated output I only have 10 watts.
> I see no movement with the grid on the meter when in the grid position.
> The plate has about 200 mils when keying the mic that is ok.
> Now I have another one that seem to work great no movement on the grid
> position plate is 200 mils and ALC position the meter doesn't move there
> either.
> Modulated out put is 50 watts peak 800 volts also showing like it should
on
> both transmitters.
> I am concerned about the ALC position can some one tell me what should be
> happening on a know good transmitter in all position rel-power and ALC and
> Plate and GRID position any help would be great.
> Thanks
> Matt
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