User's Manual

GMH Series VHF Radio Maintenance
BK RADIO Page 5-7
5.5 ALIGNMENT PROCEDURES
The GMH radio uses all electronic tuning with no manual adjustments. Use the GMH Editor computer
software when alignment or adjustment is required. You will need an IBM or compatible computer with a
disk drive, an RS-232 serial port, and DOS 3.3 or later. You will also need the GMH Editor software
diskette (LAA0737) and an RS-232 interface cable (LAA0725), available from BK Radio.
Refer to the GMH Editor Software Manual for details on using the program. When performing a complete
alignment with the GMH Editor program, follow these steps in order:
1. Radio Set-up
2. Read Radio
3. Tune Radio
4. Synthesizer Calibration
5. Crystal Color
6. Transmit Power Adjust
7. Freq Adjust
8. Deviation Adjust
9. Reference Mod
10. Tune Receiver
11. Discriminator Adjust
12. Squelch Adjust
5.5.1 RADIO SET-UP
Mount the radio in a suitable fixture supplied with 1 3.8VDC power from a negative ground external
power supply. Connect the interface cable to the radio's microphone connector and the computer's
serial port. Set the radio's manual controls as follows:
Channel Selector: Channel 1
On/Off Volume: On, Volume minimum
Scan: Off
Priority: Off
Start the GMH Editor computer program by typing EMEDIT and pressing Enter. After the title
screen appears, press any key on the computer keyboard to proceed to the Edit Screen.
5.5.2 READ RADIO
From the Edit Screen, press F9 (Read Radio) to upload the settings currently in the radio into the
GMH Editor program. The radio displays PROG during upload.
5.5.3 TUNE RADIO