[time-nuts] Looking for Tracor 599 VLF Receiver Manual
EWKehren at aol.com
EWKehren at aol.com
Thu Jan 6 20:49:03 UTC 2011
Arthur,
you mention that the 204 can select 60 KHz by thumbwheel. Do you have a
schematic of that synthesizer? I know they had a 60 KHz down converter I have
modified my unit and in my TI days modified quite a few for our cal labs
by setting the oscillator to 122 KHz dividing it by two and driving the
mixer. Still have one working and think it is still the best.
Bert
In a message dated 1/6/2011 11:05:25 A.M. Eastern Standard Time,
golgarfrincham at yahoo.com writes:
There were quite a few variations of the Tracor 599 receivers. Actually the
599K had the synthesizer built into the 599-204 receiver module and had
a thumbwheel switch that you could use to to select 60.0Khz for WWVB
reception plus a srtipchart recorder to plot the phase difference.
The 599-201 receiver schematic I've linked to may be like the 599-203
module you have except for the number of filters it can accept. There is a
broadband amplifier feeding the filter you select that sends that signal
to
the mixer where the L.O. of the received signal frequency +/- 1Khz is
combined to give the 1Khz I.F. frequency that is fed through a filter and
an amp to the other modules. If your synthesizer only goes to 30.9KHZ
you would have to modify that output to either 59.0Khz or 61.0Khz in order
to get the required 1Khz I.F. frequency. You would also need an
appropriate
60Khz xtal filter to place after the broadband amplifier. With all the old
germanium transistors used I'd question how reliable the receiver would
be.
For a receiver that was made about 1960 I really don't think it is worth
the
effort. Having said that, I do have an even older RMS Engineering VLF
comparator modified to receive WWVB that has been running for about
20 years.
http://farm6.static.flickr.com/5163/5330411094_743371545b_b.jpg
-Arthur
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