Sir Sinewave . . . . .
Is if you have powered up the unit and received a signal from the generator unit to a nearby or connected receiver in the
G thru J bands of the signal generator.
If so, then how about your having connected a low z set of headphones to the unit in order to connect to the internal RF mixer and af amp circuit within the unit ? This will then let you hear the two frequencies zero beat . . . .
*** . . . . . the variable one of the signal generator and the fixed reference one of the 2 quartz crystal references being used.
If so, then you would want to switch to the first band which would accomodate reception of the 400Khz internal xtal calibraton frequency . . .which would be the Sig gens G band which can be tuned to a 400 khz crystal frequencys 3 rd upper harmonic of 1.2 mhz. and its fourth at 1.6 Mhz and the final capable range of the 5th . . . . at 2 Mhz.
Then you flip to band H where you note that H band range will let you tune in to 2 Mhz as a 5th harmonic again, then 2.4 Mhz, 2.8 Mhz, 3.2 Mhz,3.6 Mhz and a final 4 mhz
Then, when you finally get up to I band range the reference crystal used, gets swapped upwards to a 2 Mhz unit and its 2nd harmonic
will be used to get your first 4 Mhz reference beat note.
The same referencing method to a 4 Mhz xtal holds for all of the 2 mhz freq check spreads of the I band and all of the J thru L bands.
***
ZERO BEAT ? ? ? as you tune near the crystal reference frequency used with the frequency adjust knob of the generator and you approach that frequency, one typically hears a high pitch tone at ~ 5 Khz from the xtal frequency ( 22Khz for cats and dogs, 40khz for any bats in the attic- over hearers) and it then incrementally slides down the audio scale to progressively lower frequencies to a zero beat and then a backward transition to higher frequencies, as you tune past the xtal reference.
So if you hear that tonal transition at all of the multiples of either 400 Khz or 2 Mhz meg multiples harmonics . . . . all is well with your calibrator and BOTH of its reference xtals.
Finally . . . .
Should you want UBER accuracy, you can use C192 and C144 to set your corresponding reference xtal to a zero beat against WWV , National Bureau of Standards . . . time and frequency references . ( Or the foreign equivalencies )
Manual Sub Referencing Markups . . . .
Thaaaaaaassssssssit . . . . .
73's de Edd . . . .
Now, I am proofreading this, ever so carefully, to see if I have any words out.
.
