Richard -
Do you have ANY receiver aside from your TR-4? It doesn't have to have
a BFO or be particularly stable or sensitive.
If all you have is a Broadcast Band table radio, see if you have a
commercial station on an even 100 kHz frequency such as 700, 800, 1200,
etc. It doesn't have to be local, in fact best if it isn't too strong,
and the higher the better. Get it close to the TR-4, and possibly wrap
a turn or two of wire around the calibrator tube, bringing the other end
near the broadcast receiver antenna. Turn on the calibrator and adjust
your wire until the calibrator signal is about the same strength as the
BC station, then adjust the calibrator until the signal is at zero
beat. Adjust as carefully as you can, if the signals are near the same
strength you'll actually be able to hear a slow variation in amplitude
when you're within a few Hz of zero.
This is far from ideal, but BC stations are very accurate. When you
calibrate at 10 MHz, you are comparing the 100th harmonic of the
calibrator to a known frequency, whereas with a broadcast station you're
only at the 10th harmonic on a 1 MHz BC station. But plenty close
enough for our purposes.
Better still is if you can borrow a receiver that covers 10 or 15 MHz,
and if you can resist adjusting the calibrator, they stay correct for a
LONG time. In fact, unless someone has been "adjusting" it, it's
probably close enough!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Richard Palmer wrote:
The manual says to tune to WWV ect.ect. I'm assuming this is 10Mc. .
Can I use a signal generator set to 10Mc. and accomplish the same
desired result? I have neither of these and must buy what I need to
skin this cat. Any suggestions? One caveat... it must be inexpensive.
Thanks in advance,
Richard Palmer
KB8NXO
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