17. Signal ID Oscillator Adjustment
9.While observing the HP 8566A/B display, adjust A15C629 SIG ID for the highest obtainable frequency with less than 3 dB decrease in amplitude from maximum. Read this frequency from the frequency counter and record as Fs dB HIGH.
F3 dB HIGH = |
| Hz |
|
10.Observe the HP 8566A/B display as you adjust A15C629 SIG ID for the lowest obtainable frequency with less than 3 dB decrease in amplitude from maximum. Record the frequency counter reading as Fs dB LOW.
F3 dB L O W = |
| MHz |
|
11.Calculate the difference between Fs dB HIGH and Fs dB LOW, then divide results by four. Enter the result as FOFFSET.
FOFFSET =
kHz
12. Add FOFFSET to Fs dB LOW recorded in step 10 and record the result as FSIGID.
F SIGID = |
| MHz |
|
13.Adjust A15C629 for a frequency counter reading equaling FSIGID. The final adjusted frequency must equal 10.7 MHz f50 kHz.
Adjustment Procedures