Does this group have a FAQ? If so, is it posted here on occasion or is there
a URL that I can access to read it?

As for my questions:

First of all, here's the technical info. I'm using a Grundig S350 with a 75'
longwire antennae oriented (out of sheer luck) east to west, (does that
matter?) and I'm in Seattle, WA, USA.

I'm receiving WWVH at 910 KHz below their listed frequency of 10000 KHz.
After a bit of research on the net, I've discovered that this is a "harmonic
image" that isn't being filtered out by my single I.F. design radio. What
does that mean in plain English?

Is this 910 KHz harmonic only going to show up -below- the actual broadcast
frequency, or will it sometimes appear 910 KHz above as well? (I imagine
that depends on what causes the harmonic, which obviously I don't
understand. Musically, harmonics appear at equal "distances" above and below
the node. Are these harmonics similar to radio harmonics?) And why is this
"image" so strong? My reception at 9090 KHz seems to be as good as that at
10000 KHz. (Which admittedly isn't great.)

Are there other harmonics of any given frequency that I haven't stumbled
across? For example, if I'm receiving WWVH at 910 KHz below their
broadcasting frequency, will I ever get them at say, 1820 KHz (910 X 2)
below?

How common are these images? I like to sit and spin the dial, looking for no
station in particular. When I find one, I look in my "Passport to World Band
Radio" book to see who it is. Am I going to have to check the displayed
frequency, -plus- the one 910 KHz above what my radio display says in order
to tell who it is I'm listening to, and what frequency they're -really-
broadcasting on? That's a hobby-killer right there.

Are certain bands more susceptible to these images than others? Why is it
that I get an image from a station broadcasting on 10000 KHz, but when I
checked for one for a station broadcasting on 10855 KHz I didn't get one?
Again, I'll probably have the answer to that one when I find out what causes
the images in the first place. g

I realize I've asked quite a few questions...if anyone knows of a decent
site that will help clear all of this up for me and wants to save themselves
some typing, I'd appreciate the URL. I don't mind doing my own homework, but
I've looked, and I haven't had much luck.

Another thing...has anyone ever come across a site that has audio files of
what heterodynes, birdies, etc. sound like? I hear long whistles that change
in pitch as I tweak the dial slightly above and below a given frequency, but
I never hear any chirping sounds. For that matter, are heterodynes and
birdies the same thing? I recall reading at one site that they were. Or was
it one of Yoder's books? sigh Too much input in too short a time...there's
a lot to learn!

P.S. Please don't tell me to go out an buy a more expensive radio, as I have
two kids and a boat. (That should sufficiently explain my financial
situation.) Also, please make your responses to the group. To avoid the
plague of spam, I'm using an address that dumps any email it receives right
into a virtual round-file. Responses to my personal mail box won't make it,
and thanks in advance for any help you folks give me!