Thanks for the continued stupidity DERG, you seem to have adopted Charlie Sheen's approach to life ---> "Nutter".
I presume you are going to explain that these particular cockroaches have some kind of Adonis DNA and can sense when the radio is in-tune with a station and start generating 'white noise'.
Since not much useful has been added in 24 hours ('cept the electrical schematics perhaps) I will continue to remind all the folks that can't be bothered to read the ENTIRE thread, that much fault-finding has already been done and the single MOST IMPORTANT point discovered to date are these:
- No white noise with the engine RPM below about 2350 (was originally 2250, but went up a little following replacement of plugs and 'tune-up' bits in the engine
- ONLY NOISE when the tuned station is within +/-20 degrees of the nose, goes away otherwise
- ONLY NOISE when a station IS TUNED, opening the squelch on an open frequency does NOT produce the problem effect
- Noise is NOT heard on a hand-held in the cockpit, or the Nav receivers
- Noise is the SAME whether the station is the tower 200m away or many km distant, the receive volume of the noise is constant
- Noise is heard on BOTH VHF receivers (2 fitted), originally 2 antennas on topside rear of craft
- New antenna installed on the underside of the aircraft does NOT suffer noise
(There might be a couple of other pointers I'm forgetting but I think these are the key ones)
My dis-assembly of all this is:
a) Noise is not RF signal (otherwise hand-held and nav rx would 'hear' it too)
b) Noise is not RF signal (otherwise an open frequency would carry it too)
c) Directionality - prop is in front and effect is linked to RPM.... vibration effect???
d) ADF antenna is directly above topside location of original antennas... interaction?
What am I missing (DREG - again, if you mention cockroaches I have suggestions where to insert them....)
- GY
