It's signal-to-noise ratio that's the culprit, Bob, not radial spread.
A degree at the ADF antenna on the airplane is always the same size.

Either low signals or high noise will reduce ADF performance.
Everybody knows they get squirrelly around thunderstorms.
---JRC---

"Bob Gardner" wrote in message =
news:0Zyub.182351$9E1.954218@attbi_s52...
It's a function of distance from the transmitting antenna...you have =
the
same "radial" spread situation that you have with a VOR in that one =
degree
spreads out 100 feet per mile from the antenna. The further you are =
away,
the slower the response. You should also know the class of the =
facility from
the A/FD...an H beacon is good for 50 miles, HH is good for 75 miles,
LMM/LOM good for 15 miles, MH good for 25 miles. I've had many a pilot =
try
to pick up an outer marker from 25 miles away and gripe because s/he =
wasn't
getting a good signal.
=20
Bob Gardner
=20
"Ben Jackson" wrote in message
news:4Iyub.178554$mZ5.1264586@attbi_s54...
My ADF (Narco 841) quit pointing shortly after I got the plane, so
I pulled it and found it was covered in swarf (metal shavings) so I
cleaned it off, cleaned the contacts (card edge connector) and put
it back in. Now it points again. What I'm wondering is: How fast
should it point? Let's say there's nothing on freq 200 (default)
and I tune a nearby NDB/marker on standby and hit swap. How fast
should the needle point? I realize that in flight it doesn't have
much call to move quickly, but until now I was never paying =
attention.

--
Ben Jackson

http://www.ben.com/
=20