[Test-Equipment] Strange WWV device by Projects Unlimited

[Bill Fuqua]

    I can tell you probably how to use this item.
The magic eye tube should be sort of like an S meter.
If you have function switch in normal position it works as a WWV receiver 
for 5 or 10 MHz.
The fine tune control varies the crystal control local oscillator to get it 
dead on frequency.
In the 440 or 600 Hz mode audio band pass filters pick out these two 
standard tones and send them to the audio output.
There should be some fine adjustment pots on the back associated with the 
active audio filters.
In the beat carrier mode the front panel input is mixed with the input from 
antenna to produce a beat frequency.
   This allows you to set your 100kHz calibrator very precisely by using 
the magic eye tube to observe very low
beat frequencies.
   It function is similar to the LA800 that I have but it is not nearly as 
complex.
The LA800 has very narrow IF filters that allow you to compare input 
signals against a
WWV signal even though the WWV signal is very weak.  It also has a 
oscilloscope display that will produces
a beam that sweeps in a circular pattern. It rotates clock wise if your 
local reference is high in frequency and
CCW if it is low.
   It also reproduces the audio tones as well.
   Each cycle per second of the magic eye tube corresponds to 1 part in 10 
million at 10 MHz and 2 parts in 10 million when
receiving the 5MHz WWV signal.



At 07:03 PM 12/26/2012 -0600, you wrote:

>I've come across a strange receiver by Projects Unlimited, called a P-1375 
>Frequency Comparator.  I've found one hit from a ham in Europe with a 
>P-1376 and they look virtually identical.  If anyone has any data, 
>documentation, circuitry, etc. on this, please get in touch.  Picture on 
>request.
>73 to all & Happy Holidays,
>
>John W5JV
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