looking at 651S-1 IF,
with WWV signal.
For sixty years
US television used the NTSC
digital television has replaced almost all analog transmission.
part of analog television transmission monitoring was a good waveform
(WFM). They started out life as a two hundred pounder with 50
later, some very nice WFMs were built which were small and
example would be the Tektronix 1710B.
These items are surplus at most video facilities. I bought a
unit in perfect
condition for a whole Dollar at a university surplus store!
WFMs are essentially a specialized
oscilloscope; they have horizontal scan at 60 Hz and 15734 kHz.
The vertical response will be from a few Hz
to around 4.5 MHz. This means they will work on receiver IF's in
the 450-500 kHz
range and also on 160 and 75 Meters. The input sensitivity is
Volt. The photo shown above is an example of a Tek
1710B looking at the IF of a 651S-1, the signal is WWV (more ticks-more
The disruption in the picture is a scan rate issue between the camera
These things are gnarly to repair so I would find a working
pay even $20 for a nice one.
find AM especially a fun experience with an incoming envelope
monitor. A word of caution: the
R-388 / 51J3 (4) had a very poor IF output signature; it is
crushed on one side (- going) due to the diode load of the
be too quick to be a modulation cop with your new instrumentation, but
otherwise.... Have fun!
Other examples of
small WFMs include
the Leader and Hitachi
units shown above.