--- "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> I'm looking for a MICOR UHF Repeater/Base Station
> 12-Watt 450-470 MHz PA
> Deck, Motorola # TLE1683A. I have one of the 2-watt
> versions of this PA,
> which is just about identical except that there is
> an attenuator that drops
> the output power from 12W to 2W (what a waste!), but
> there are some other
> undocumented parts like the thermistor that I
> understand would need to be
> changed, as well. So far, no one that I've talked to
> has come up with the
> correct modifications to change it from a 2W to 12W
> amp except for the part
> of removing the attenuator assembly.
>
> I'm looking for one of the 12W PA Decks to use in a
> HF Remote Base project,
> and don't want to use the 75-Watt PA Deck - I've
> seen way too many of them
> on service benches at Motorola Service Shops over
> the years that have
> smoked. This one will be running key-down for hours
> at a time, sometimes.
>
> I would also be interested in one of the UHF MICOR
> Station 20-Watt model #
> TLE1693A or the 45-watt model # TLE1703A PA decks -
> they look like the 75-
> watt TLE1713A PA outside with the big rear heat
> sink, but they have fewer
> circuit boards and parts inside.
>
> Thanks,
> Larry
>
You might consider bypassing the final stage in the
UHF micor, the stage that drives it is good for 25
watts or so continuous duty. On that big heatsink the
thing probably won't even get warm. You might have to
modify the power control board slightly by changing a
couple of resistors. It might not allow good power
control down in the 25 watt range without the mod.
With proper mods, the power control board is good down
to 2 watts or so.
The 25 watt portion can be adjusted down to 10 watts
or so. The stage that drives the 25 watt section will
put out 10+ watts, and the controlled stage will
usually put out 4-7 watts. All of the stages couple at
50 ohms, so just determine what you want power wise,
and use the stage that fits your needs.
Joe
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