Henry uses all fixed capacitors in their amps. Whether they change values for specific band portions, or adjust the coils, is unknown.
I bought a C100D10R amp from them and asked that it be tuned to 444.450 MHz and also wanted female N connectors on it. They gave me exactly what I asked for and it gives me 80 watts out with 7 watts in, and that's going into a duplexer then into an antenna. I also had a C80D3 amp on 460-something that I sent to them. They removed the pre-driver (turning it into a C80D10), tuned it to 444.450, Installed female N connectors, and sent it back with a manual and a new power cord, all for about $85. They seem to be very good answering e-mails, so I'd write to them and inquire, but only after verifying that the amp is not performing to specs on the bench with a good dummy load and adequate drive and power. Bob M. ====== --- n3dab <[EMAIL PROTECTED]> wrote: > Greetings to the group, > > Does any one have any specific info on retuning a > Henry C200D10R UHF > 450-470 rack mount PA into the 440 band ? The PA > requires 5-10w to > produce 100-200w out. I can see nothing inside that > is adjustable, > all the components are fixed value and securely > soldered in place. > The only thing that might be adjusted is the spacing > of the coils on > 4 wire wound chokes, 2 near the input and 2 near > the output. > > The PA belong to a friend who purchased it used from > a 3rd party, had > it shipped to Henry to put on 443.750, and return > for use. A simple > bench test into a 50 ohm dummy load shows that > (using a IC2400 mobile > on low power) 8-9w in at 443.750 yields about 45w > out but as I > increase the freq. to 462.750 the IC2400 pwr drops > to 5-6 w (which I > would expect from from the mobile being out of band) > but the PA > output pwr. jumps to over 100w. > > My suspicion is that Henry did nothing but make sure > it was working > in the deigned band range(450-470) and slap a new > label on it and > send it back. > > Will compressing the choke coils closer together > make any difference > in the freq. range, or do some of the fixed > components need > replacing. I know the choke compression worked in > retuning a ARR 450- > 470 preamp to move it to 440 (per ARR directions). > If so, how close > should the coils be spaced ?? > > TIA for any help > Doug N3DAB __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
