Bill,
The TKR-750 is factory-set for 50W on high power and 25W on low power.
There is one pot to set the power level, and the control microprocessor
simply adjusts the gain of the feedback loop to select high or low
power. The final PA is a 2SK3478 MOSFET transistor which, like most
PAs, gets very unstable when driven below specified levels.
The above information came from the TKR-750 Service Manual B51-8556-10.
I don't have my TKR-850 Service manual handy, but I believe that the
high and low power levels are achieved in a similar manner.
Be aware that the helical resonators in the receiver's front end must be
adjusted for your operating frequency, before placing the repeater in
service. There are also soldered jumpers to install when you have the
covers removed, for fan control and battery backup options. You really
should have the Service Manual in hand before attempting any adjustments
or option selection.
73, Eric Lemmon WB6FLY
valleyforge2002 wrote:
>
> Hi all, thanks for the help given so far. This is starting to become
> very interesting.
> When setting up the repeaters the power in the software (KPG-66D) is
> either "High" or "Low", anyone know what are the actual levels that
> this defaults to when uploaded to the TKR's ?
>
> I have a VHF and UHF (Brand New) TKR-750 & 850 just waiting to be
> programmed once I get the lead which has been ordered so I am setting
> up the files making them ready for upload.
>
> Regards
> Bill G0DEO / 9H1IA
>
>
> Yahoo! Groups Links
>
>
>
>
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