Gaz asked,
B> What puzzles me about these VHF modulators is why they drift off frequency
B> so much.
Jim answered,
C> The units need to be tunable so you can tune to an unused spot on the
C> dial. They are also of low power, and as such as you drive near
C> another radio station, interference casues the radio to drift to the
C> stronger signal. (FM capture and intermodulation products probably)
On top of that, try *finding* an open frequency in a large metropolitan area.
I tried two models and couldn't get either to work in my driveway, let alone
throughout a short in-town commute. Even parked I had to keep retuning the
receiver, so some of the drift has to be in the transmitter.
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