Michael Black wrote:

starman ) writes:
Mark Zenier wrote:

Here's a suggestion, hit a swap meet (or ebay) and get 1) rf signal
generator and 2) a (digital) frequency counter. When you're lost on
the SR-III, (turn on and) adjust the generator (with the counter hooked
up and working) until you get a heterodyne and then just read out the
frequency.

You can buy a digital frequency display which will work with most any
shortwave or MW (AM) receiver from the following website. Price is about
$60.

www.aade.com

I figured Mark was suggesting a roundabout method because he figured (or
knows from experience) that connecting a frequency counter to the radio
may cause garbage to appear. If I recall, he was replying to a comment
that the Superradio had an advantage in not having any digital circuitry.

I suspect adding a frequency counter may result in digital noise appearing
in the radio, especially since the Superradio is indeed a very cheap and
unshielded radio.

I was going to suggest a crystal calibrator (with digital dividers, one
can get down to 10KHz and count them, yet use a higher frequency to get
the 100KHz points), but then I remembered that it might be more difficult
counting the points without a BFO.

Michael

The digital displays like those from aade.com have buffered inputs to
isolate them from the receivers oscillator. If the display is connected
properly to the receiver, there shouldn't be any noise problems.


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