do I have an ADF problem ?

Hey... have been flying instrument practice in the Bay
Area for the past couple of months and have been flying
NDB approaches without any trouble, but yesterday I
was setup for the OAK NDB 27R and could not get the
station. Needle didn't point and could not get the
identifier.

Tuning the ADF to other stations, like KGO AM or
REIGA compass locator works fine. Every station I
tried except RORAY (OAK compass locator) worked.

Still, we requested and were granted the NDB
approach at OAK and that seems like it would have
been a good time to tell me that that RORAY compass
locator was OTS. Nobody said anything.

Later, on the ground, I looked over NOTAMS to see
if there had been a frequency change or other problem
with RORAY, but I couldn't find anything.

Any ideas? Do I need to investigate this further?

My instructor figures that it's something screwy
about the OAK NDB transmitter, not the ADF in my
rental aircraft. But what kind of screwy could
it be? It either works or not, right? I guess I
can imaging frequency drift from 341 kHz to 340.5
kHz or something, but is the front end of an ADF
that selective?

It'll be embarassing on my very soon upcoming
checkride if I take a plane up with an supposedly
working ADF and then can't fly approaches with it.
I would think the DE would want to know why it
was not placarded if it was known to be flakey.

Any advice welcome.

sincerely,
-- Dave
jacobowitz73 -at- yahoo -dot- com