Actually without being as smart as some of you I can still disagree with
this.
Most radios do get out of alignment. I have been on the receiving end
of splatter. A tuneup couldn't hurt.
Receivers do emit RF. An ESL member has come up with a way of tracking a
receiver based on its emission. He started with duplicating the Walston
receiver using a Yasu and other Scanners. Then by playing around he
noticed he didn't need a walston transmitter in the plane, that with
many RX's he could actually see their output on scanners. While true
not all receivers emit, most emit enough that he was able to pick them up.
I received a couple of bumps at the nats, but I remember 2 guys being
out of shift enough that they caused I think it was Daryl to go in..
about 6-7 years ago. When the scanners looked at their frequencies they
were obviously off of their channel... enough to be a problem.
Gotta run... my 2 cents.. probably all it is worth...
Martin Usher wrote:
What a novel and smart suggestion. Makes one wonder how many TX's out
there have never experienced a tune-up...
They don't have any moving parts. Older radios may have parts like
descrete coils (sometimes with slugs) that can can change their size
slightly over time (mechanical, maybe due to just moving the radio
around) so its possible that the output spectrum could get misshapen
(i.e. "splash over to adjacent channels"). Its even possible for
crystals to age or get damaged. But in general what you buy should be
what you'll use until the mechanical parts wear out.
That's not to say that it wouldn't help to look at the output spectrum
from time to time, but (IMO) suggesting to people that radios somehow
require regular servicing like a car is an application of FUD.
Martin Usher (........time for the flameproof suit........)
PS. Receivers don't emit R/F -- actually they could but they shouldn't
-- but if the transmitter is prone to drifting around then the receiver
would be as well, they've got the same kinds of internals as the Tx.
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Jeff Steifel
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