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----- Original Message -----
From: <JOSCALES@aol.com>


I presume you can duplicate the problem on the ground. Try this. Disconnect
the primary lines to the NAVCOM. In their place run  heavy gauge wire
directly from the transmitter to your battery. Now when you key the
transmitter the heavy current draw that occurs with transmission cannot pull
down the voltage or rob current from any of those various other instruments
that are being disturbed during transmission.
If you don't get the disturbance with this dedicated test wire in place,
restore the original connections and use a sensitive voltmeter to find where
the major drop is along the circuit from the battery to the transmitter. It
does not have to be in a component. It could be as simple as a wire in the
feed line that is adequate for all but the heavy loads demanded by the
transmitter.
As soon as you press the PTT the xmitter sends a carrier signal and draws
very heavy current. It is not necessary to activate the VOX circuit with mic
input to initiate the load.
I would run both ground and high side dedicated test lines for a
comprehensive test.
It may help during your experimenting to think of current as the amount of
electricity and voltage as the pressure with which the amount is being
delivered.

Good luck        Bob Barker



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