Load Control Help Please!!!

[John Croft, Jr., K3NJ]

Hi Dan-

Sounds like you are *over-LOAD-ing* the amp . . . seriously tho . . . try
two things: (1) put a thru-line SWR between the Heath output and Amp input
. . . this will show whether you have a match problem between the two
units (as suggested by "zero" loading) . . . and (2) try to reduce the
Heath (hence "exciter") output to 70 Watts or less . . . if the
manufacturer says "70 W" try to keep it in that area by reducing the
carrier level when tuning . . .

AND when you get to modulating carefully set your ALC so you don't cause
spurs (splatter) . . . good luck


73,

John, K3NJ

--
**************************************************************
*   The Maryland Crofts are John (K3NJ) and  Kathy (KB3BPN)  *
*        Monitoring K3VOA/R on 147.045 + Washington, DC      *
*                 http://patriot.net/~croft                  *
**************************************************************

On Sat, 31 Jul 1999, Dan Pividal N4VET wrote:

> Load control help.
> I need help with the load control on my Dentron GLA 1000.
> I know this is not a Heath but it is hooked up to one.
> When I try to tune the amp. the tune control works on the money.
> However, when I try to advance the load control I blow the fuse on the amp.
> Example, on 14 meters the load control is to be preset at 5 and the tune
> control at 14 meters.
> To get maximum power out of the amp I have to turn the load down. I get
> maximum power with load control at 0. If I then try to raise the load control
> power output drops and I blow the fuse. This happens on all bands. The best
> power output takes place with load control set at no more than 1. What gives
> guys?
> The amp. is looking at an SWR of 1:1. but blows fuse even on dummy load.
> I have 4 new 6LQ6 tubes and the power supply is putting out 1200 volts,
> factory spec.
> I have checked amp for shorts and bad caps. Also, other HAMS who have used
> this amp say I should be getting at least 550 output with 70 watts input. I
> only get 380 at best with 100 watts input.
> Seems all this is related.
> If anyone can help I will be very grateful and I will have something to play
> with this weekend.
> Thanks,
> Dan N4VET
>
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