Go over to your local car stereo shop - the place where they
sell those 500w amps and build the latest and greatest
boogie buggys or thump trucks - and get a pair of speaker
isolator transformers. They may not call them that, but
picture a 8 ohm in / 8 ohm out transformer about the size
of a can of Coke or Pepsi, or a little smaller.
Put one on each radio. Test by putting a speaker on the
secondary. It should work normally.
Unhook the speakers. Wire the secondaries and the
speaker all in parallel.
A friend has two of these setups in his vehicle, on two
Kenwood 742s... one radio is 10m / 6m / 2m and the
other is 220 / 440 / 1200mhz, and each radio has two
speaker outputs - the selected channel and the
nonselected channels. He has the selected channels
fed to one speaker (in the left door) and the non-selected
channels fed to a second speaker (in the right door).
Car stereo shops have a few things to offer the ham -
like decent multiple fuseblocks, good automotive
DC wire, and speaker transformers. It's worth
spending an hour perusing their offerings...
Mike WA6ILQ
>--- In Repeater-Builder@yahoogroups.com, DCFluX <[EMAIL PROTECTED]> wrote:
> > Anyone had experience with mixing the speaker output of 2 radios,
> > Say Motorola GM300's to one speaker?
> >
> > I originally tried a couple of resistors but I may have the wrong
> > values as they got hot as hell and one started smoking, I was
> > using 2 .82 ohm at 2 watt resistors for each radio, one resistor
> > in each speaker lead and at the center the speaker. My next
> > best guess is using a multiple winding transformer with three
> > windings of 4 ohms, but finding information on how to wind a
> > transformer to do that is impossible these days. Any Ideas?
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