Hi Alex, Thanks for the reply! Your description of the pots was great but I don't see ANY tuning caps on any boards in this amp. There's a 10watt board that feeds a 65w board. Then, this 65w board gets split to feed two more 65w boards which get combined as the final output.
I can easily set R10 to 100 watts but I would like more info on the tuning caps if it's applicable to this amp. At 100 watts the amp is drawing about 28 to 29 amps. I may be incorrect but I thought some of my other 250mw in 100w out PA's only draw 22 amps. Thanks again! Adam N2ACF On 6/5/2010 6:04 PM, opelgtalex wrote: > 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 Repeater-Builder@yahoogroups.com, 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 >> >> > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > >
