Thanks for the input.
--- In Repeater-Builder@yahoogroups.com, "Bob M." <[EMAIL PROTECTED]>
> 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
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