Adam- R10 controls the bias voltage to the first stage driver- this sets the power out of the amp. Turn this pot down (lower the PA output) peak out all tuning caps starting at the 1st stage, then the 2nd and on to the 4 driver boards. Once all tuning caps are adjusted for peak output, then adjust R10 for the amplifiers rated power out (100W in your case). R9 controls the foldback power in case of a high temp condition the power output is cut by 3dB- the thermal switch is located just below the control board. As per manual R9 is adjusted by removing power from the cooling fan, key the RF source, wait for the unit to reach 135deg F and adjust R9 for 3dB below rated amp output- this is per manual. Hope this helps, Alex
--- In [email protected], Adam Feuer <feu...@...> wrote: > > Hello All, > > I have a Milcom International UHF PA on the bench. Model number is > P12-O5HA1-C1 rated at 250mw in with 100w out. I'm trying to identify > what two pots (R9 & R10) do on a board that "seems" like a control > board. Both pots appear to vary the output power and current draw, > although one does it more dramatically than the other. > > Anyone have a manual or information for this PA? Any help would be > greatly appreciated. > > Thanks!! > > Adam N2ACF >
