A M-120 or GM-300 would be a better choice for your TX radio. Maxtrac
radios do not have any PA thermal feedback to the contol board, where the
newer radios do. The Maxtrac will have to be fooled into thinking it is a
136-162 MHz radio before the power control circuit will work below 146 MHz.
This requires blanking the logic board and re-initializing it as a
low-split radio.
Another other option is to use a LM-317 and build an adjustable regulator to
drive the power control line going to the PA.
One other nasty habit the Maxtrac radios have is that when continously
keyed for more than about 9 minutes, the controller will run the TX power
down, eventually cutting the PA completely off. This "feature" is built into
the radio firmware to "protect" the PA because there is no monitoring of
the PA deck temprature. Using the external regulator gets around this
problem also.
Hope this info helps. 73,
Kevin, K9HX
At 08:55 AM 2/4/2006, you wrote:
>I just bought 2 maxtracs with the intent of making a repeater.
>Model#D33MJA77A3CK. The radios work ok but they are 146-174Split. The
>problem I am having is that I have no control of the RF output. I dinked
>around inside of the RSS and I can set the power within the radios
>bandsplit but once I do the shift button trick and take it outside the
>spilt, it just goes into overdrive.. This is supposed to be a 25watt
>radio but outside the limit it ramps up to 35w.
>
>Is there a trick to reign this thing in?
>
>Or am I just going to have to look for a different radio that goes where
>I want it to?
>--
>Jay Urish W5GM
>DCARA President ARRL Life Member
>TXFCA President ERS Vice-Prez
>Denton County ARRL VEC
>N5ERS VP/Trustee
>
>Monitoring 1292.30Ghz PL-100.0 441.375 PL-88.5 and 444.850 PL-88.5
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
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