[BC] Listeners Loading down the Transmitter: WAS Listening in thecar

[Thomas G. Osenkowsky]

> That reminds me of "The Negative Frequency Effect"  If you reverse the TX
crystal in its holder you generate negative frequency.

Remember when the FCC clarified the definition of "Carrier Shift" to
"Carrier Amplitude Regulation"? "The Negative Frequency Effect"  is
defined as "Carrier Frequency Regulation". One of the primary
causes of negative frequency shift is poor oscillator power supply
regulation. It is recommended to use Monster brand deoxygenated
cabling in the RF oscillator power supply. This is also true for the
19 kHz pilot oscillator in stereo generators. Poor pilot frequency
regulation results in poor stereo imaging, and center channel buildup.
As the transmitter draws more current under modulation, the supply
voltage can sag and cause the above ill effects. Low loss cabling reduces
the I2R losses and promotes improved supply voltage stability and
ripple frequency regulation.

You can also place an 8 ohm to 1 to 10k ohm transformer across a
speaker (low-Z towards speaker) and use the speaker as a microphone.

Tom Osenkowsky, CPBE