If they are very strong, perhaps you can use a relatively poor antenna so it
only picks up strong signals and try putting it into scan

It helps to know:
1- How did you determined the "..around 20MHz..." number.
It could actually be 1/2, 1/3, 1/4 that freq.
2- Were you able to hear the true, exact oscillator signal with the
receiver.
3- the IF of the receiver used and
4- what frequencies you had the reveiver tuned to when you heard these
signals.

The front end of these wide coverage handhelds are pretty broad with almost
no filtering. The oscillator can easily act as an L.O.


Where F1 and F2 are the oscillator and the receiver L.O.:
The result can be F1 +/- F2 +/- the IF frequency.

Then it can be N * F1 and N * F2 that can be the culprets where N = 1, 2,
3. Chances are pretty good that the signals are not much above 20MHz.

Use a spreadsheet to do the math and it is easier to cover all these cases
when you have some frequencies to enter.


73, Steve, K.9'D;C,i



"Ben Jackson" wrote in message
...
I got a bunch of identically (but cryptically) marked crystals that I
wanted a ballpark idea about so I built the oscillator part of the Pixie
II (up to Q1) and put a scope on it. It was around 20MHz, so I grabbed
my HT and tuned around 20MHz to see if I could find it (this, by the
way, is why you should not borrow the lcd display from your frequency
counter for another project...). What I discovered was several signals
above 20MHz (eg 21.040) that only existed when the oscillator was on.
I assumed it was picking up something else and mixing it with 20MHz so
I tried to find the original signals at 1040kHz but I couldn't. The
"mixed" signals were very clear and strong. It was some kind of news
(shortwave?) in an Asian language.

Where else should I have looked for the base signal? ~41MHz would be
in the middle of a government band.

--
Ben Jackson

http://www.ben.com/