Re: Marker Generator


From: James R. Duffey (
Date: Wed Dec 05 2001 - 21:48:18 CST

Tom - I am one of those who pushed the marker generator kit. You don't need
it for building the Tuna Tin 2, but it is so useful that as long you are
mailing a check to Jay, you may as well include the extra $12 for a marker
generator kit.

The VE3DNL marker generator generates signals every 5 kHz, 10 kHz, 20 kHz,
or 40 kHz. You select them. They are good up to 30 MHz. I can still hear
mine at 50 MHz. Your markers may vary.

What do you do with it? If the band seems particulary dead, fire up the
marker generator, and see if you can hear it. That will tell you if the band
is dead or if your receiver is dead. Of course you should do this when the
band is open and receiver is working, just so you know what level to expect.

It is ideal for building recievers. If you finish your 20 M
receiver/transceiver at 3 AM and the band is dead you can still align it
with the marker generator. Just fire up the generator and align the rig. You
can use it to set your BFO offset as well.

You can also use it to calibrate your dial. Say you are on 40 M. Tune in
W1AW on you receiver. You know that this is 7047 or so. Switch the marker
generator on to 40 kHz. Tune down from W1AW until you hear the marker. Mark
40 kHz on your dial. Switch the marker generator to 5kHz and calibrate the
rest of the dial.

Set the crystal trimmer to zero beat with WWV and you have a secondary
transfer standard for frequency. Just like the big labs.

You can also use the marker generator to tell how wide your VFO coverage is.
Set to 5 kHz and see how many markers you hear.

It is a simple kit to build and serves as a good "warm up" for the Tuna Tin
2 if you have not built a kit before. It also impresses those old geezers
(like me) at your local club meeting when you take it to show and tell.

Mine isn't in a box. - Dr. Megacycle KK6MC/5 "Radio Green Chile"

James R. Duffey KK6MC/5
Cedar Crest, NM   DM65

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