EFJohnson 764X - Manual (Page 62)

ADJUSTMENT PROCEDURE
6-7
November 1998
Part No. 001-7600-001
3. Connect an RF signal generator to the antenna jack.
Set it to the channel frequency with an output mod-
ulated with 1 kHz at the following deviation:
Wideband (30 kHz) Models - 3.5 kHz
Narrowband (12.5 kHz) Models - 1.75 kHz
4. Scroll to “SQL” on the computer screen and press
the adjust keys to lower the displayed number so
that the receiver unsquelches (the 1 kHz tone is
heard). Also adjust the volume if necessary.
5. Adjust the signal generator output to obtain 8 dB
SINAD.
6. Press the computer adjust keys to increase the dis-
played number to the point where the receiver
squelches. Then slowly adjust the number down-
ward again until the receiver just unsquelches.
6.5.3 BEEP TONE LEVEL
This adjustment sets the volume of the beep tone
that is heard when keys are pressed and at other times
(if it is enabled). The computer setup used in the pre-
ceding steps is not required for this adjustment.
Proceed as follows:
1. Unplug any cable that may be plugged into the
microphone jack and locate R60 inside this jack.
(see Figure 6-5).
2. Repeatedly press a front panel switch to enable the
beep tone and adjust R60 for the desired level.
Figure 6-5 Beep Tone Level Adjustment
Level Adj
Beep Tone
R60
VHF ADJUSTMENTS (CONT’D)