Squelch is a "dumb" device on cheap radios. It just looks
at the total RF signal level, from any source. You said
that the frequency was 122.7, which is a common frequency,
at 200-300 feet AGL, you're getting your mags [which
probably are not shielded on a NORDO aircraft], and all the
hundreds of transmitters within 200 miles line of sight.
Your hand held may also not be sensitive enough to reject
the adjacent frequencies.


"john smith" wrote in message
...
| In article
,
| Mark Morissette wrote:
|
| *Only* when you hit a few hundred feet...or anytime the
engine is running?
|
| Personally I'd venture to take a guess that it's picking
up electrical
| interference from an ignition component.
|
| I thought that too, but it doesn't make sense that it
would start
| 100-200 feet AGL. If it is ignition, it will be present
any time the
| engine is running.