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, golgarfrinc...@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.