Actually, if there is an *easy* way, I'd sure like to know!

I started my DF'ing in the Navy in the late 60's, so I'm no slouch.
This is a very sticky problem; few ways to do this. All phase systems
(Doppler, TDOA) require the signal to be well centered in the IF and a well
behaved IF to boot. The amplitude systems (beam, single / dual cardioid)
are better for this, but the sweep-width of this signal makes the beam less
effective due to the change in gain as you get off the design freq.

If I had the time, I'd modify a wide band FM receiver (like a broadcast
receiver 88-108) with a *really* aggressive AFC so it would follow the bogie
along. Then a TDOA should work. Actually any would be better with this
receiver, but I would have to do a little characterization across the
expected freq range first.

I think *any antenna* and a spectrum analyzer watching signal strength is
the best bet...already done some of that. The biggest problem is that it
is most active when we have the least time to hunt.
Steve





"Crazy George" wrote in message
...
Ed:

I think Steve would be interested in hearing a methodology for DFing a
non-stationary signal, as would I. I have tried to track one of these
spurs
with a receiver while simultaneously attempting to get a bearing, and gave
up. The Doppler DF systems need it in the passband and frequency stable
for
at least one "revolution" of the virtual antenna, which doesn't happen, so
let's hear what works.

--
Crazy George
Remove N O and S P A M imbedded in return address

"Ed Price" wrote in message
news:mXnYb.502$C21.147@fed1read07...

"Steve Nosko" wrote in message
...

"Ed Price" wrote in message
news:jaoXb.72863$fD.59039@fed1read02...
THAT
"Steve Nosko" wrote in message
...
Diathermy was mentioned in the longwire exposure thread and made
me
think
of
this long standing problem here in northern IL..

For some years now, there has been interference on the local 2M
repeater
(145.41) which sounds just like the diathermy I used to hear on
10M
long
ago. [snip]
Steve N, K,9;d, c. i My email has no u's.

[snip] If the RF source is quite close to the repeater, maybe you
are
seeing an image response to the 5th harmonic.
wb6wsn

Not an image. Spec analizer and many other receivers hear it, as
well
as other repeaters.

Steve


Well, if you have that much time to observe the offending signal, start
DF'ing it.

Ed
wb6wsn