[Heathkit] Need schematic for IP-2715

[wb8jkr at juno.com]

> 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?

 There is an adjustment pot inside to zero the ALC meter in
transmit with no modulation.

> 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 final is class AB1, there should be NO grid current
during SSB operation, and less than 1 ma (FS) during CW
 A non-peak responding wattmeter may very well only
show 10-20 watts output.

> 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.

 Showing 50 watts out during SSB with a non-peak reading meter
more than likely means your over driving it.

> 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

 The ALC meter will peg during receive, and if the zero pot
is properly adjusted, read zero with the rig keyed with
NO modulation. The REL output means little, it can be
adjusted to read any desired amount by the pot mounted
on the front of the final cage.

73,  Mark  WB8JKR




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