[TenTec] OmniVI Plus Over Drive Amp

[Ken Brown]

Hi Jim,


That 300 watt mark on the bar-graph indicator means nothing if the 
circuit is not calibrated to a known standard.

On the CONTROL BOARD there are three potentiometers that are fed by the 
forward power sensing circuit. One controls the FWD meter calibration, 
one controls the bar-graph RF OUTPUT indicator and the other controls 
the level to the fault (overdrive) comparator. On the same board there 
are two potentiometers that are fed by the collector current sensing and 
summing circuit, one controls the IC meter calibration and the other 
controls the level to the fault comparator.

Most likely one of the pots that feeds the comparator is not adjusted 
correctly. You need to have the pots that control the meter calibration 
adjusted correctly before you attempt to adjust the ones that feed the 
comparators. If you start making adjustments, without some kind of 
separate measuring devices, such as a Bird 43 RF watt meter and a 20 Amp 
full scale DC Ammeter, you will end up with the settings even further 
into the unknown zone, which could be disastrous for your nice amplifier.

DE N6KB

Jim WA9YSD wrote:
> I am just using the RF Output LEDs on The Hercules II.  Does not really matter, it is not MAX output thats for sure.  Instantaneous spikes are being cut off at the 300 watt mark and no OVERDRIVE.
>
>  Keep The Faith, Jim K9TF/WA9YSD
>
>
>
>       
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