BK Radio GPH-CMD, Service Manual

Page: 59 / 128

Maintenance GPH-CMD VHF Radio
Page 5-6
BK RADIO
5.5 ALIGNMENT PROCEDURES
The GPH-CMD radio uses manual alignment for receiver front end tuning, receiver IF alignment
and VCO adjustment. Electronic tuning is provided for all other adjustments. You will need the
GPH-CMD Editor Software and programming cable, available from BK Radio. Refer to the GPH-
CMD Editor Help file for more complete details on using the program.
5.5.1 TEST SETUP
Mount the radio in a suitable fixture containing an adapter for supplying 10 VDC from a negative
ground power supply. Turn off any radio features assigned to the keypad function menu and set
the manual controls as follows:
Channel Selector: Channel 1
Channel Group: Group 1
On/Off Volume: On, volume minimum
Monitor / Squelch Unsquelched, fully clockwise
Radio Top Switches Off (Toward front of radio)
Refer to Figures 5-1 and 5-3 for Transmitter and Receiver Test Setup. These figures show the
interface between test equipment and the radio. See Figures 5-2 and 5-4 for location of the
various adjustment components.
5.5.2 ALIGNMENT ORDER
When more than one adjustment is necessary, follow the order listed:
A. VCO Adjustment
B. Transmit Power
C. Reference Oscillator Frequency
D. VCO Modulation Sensitivity
E. Receiver IF Alignment
F. Receiver Front End Tuning
G. Receiver Front End Slope
H. Squelch