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Alignment Procedures
Low Current Base Tech 3.5
RECEIVER (RX MAIN UNIT)
1. Pre-selector and Post-selector Tuning
Both selectors have been pre-tuned at the factory, so no alignment is required.
2. FVR001 Tight Squelch Level
This potentiometer allows adjustment to the tight squelch level.
3. FVR002 De-mod out Bias Level
This potentiometer allows adjustment to the level of DC Bias on the De-Mod output.
4. L303
VCO
Alignment
The VCO has been aligned at the factory to cover full sub-band. However, if you need to re-adjust VCO
after a repair, set the VCO voltage to 10.5 V at the highest end of the sub band using L303. The VCO
cover must be removed for access.
Note that tuning slug may be glued and breakage could occur.
5. RX 0-dBm Level Adjustment
This is 600 ohm audio available on pins 20 and 21 of the EXT Option port. It is electronically adjusted.
Ground TP-2 on the Analog Logic Unit PCB, and power-up the radio.
See Figure 3 on page 6
. The
station is now in Adjust Mode. Release TP-2 from ground. The display should look as follows:
RXNS <Adjust>
TXN RX 0dbm Out
C0001 27 / 31 AA
Use the “A” and “B” keys on the front panel to adjust the level up or down. Pressing the “#” key will
change the mode you are adjusting. The “A” key will increase the level while the “B” key will decrease
the level. You will be able to monitor the output if the station is receiving a valid carrier and signaling.
Cycle power to the radio to return to normal operation.
NOTE: The other ADJUST Modes are in order of appearance:
RX 0 dbm
REPEAT DEVI
DIGITAL DEVI
ANALOG DEVI
TONE DEVI
CTC DEVI WID
CTC DEVI NRW
© 2012 Midland Radio Corporation
6
Содержание 91-1060-91-1110
Страница 22: ...Circuit Description Low Current Base Tech 3 5 Notes 2012 Midland Radio Corporation 18 ...
Страница 23: ...Block Diagram VHF 60 Watt Low Current Base Tech 3 5 19 2012 Midland Radio Corporation ...
Страница 24: ...Block Diagram VHF 110 Watt Low Current Base Tech 3 5 2012 Midland Radio Corporation 20 ...
Страница 25: ...Block Diagram UHF 50 Watt Low Current Base Tech 3 5 21 2012 Midland Radio Corporation ...
Страница 26: ...Block Diagram UHF 100 Watt Low Current Base Tech 3 5 2012 Midland Radio Corporation 22 ...
Страница 27: ...Front Panel Unit Schematic Low Current Base Tech 3 5 23 2012 Midland Radio Corporation ...
Страница 28: ...Analog Logic Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 24 ...
Страница 29: ...VHF RX Main Unit Schematic Low Current Base Tech 3 5 25 2012 Midland Radio Corporation ...
Страница 30: ...VHF RX VCO Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 26 ...
Страница 31: ...VHF TX Main Unit Schematic Low Current Base Tech 3 5 27 2012 Midland Radio Corporation ...
Страница 32: ...UHF RX Main Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 28 ...
Страница 33: ...UHF RX VCO Unit Schematic Low Current Base Tech 3 5 29 2012 Midland Radio Corporation ...
Страница 34: ...UHF TX Main Unit Schematic Low Current Base Tech 3 5 2012 Midland Radio Corporation 30 ...
Страница 35: ...Front Panel Unit Layouts Low Current Base Tech 3 5 31 2012 Midland Radio Corporation ...
Страница 36: ...Analog Logic Unit Layouts Low Current Base Tech 3 5 2012 Midland Radio Corporation 32 ...
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Страница 43: ...Palm Microphone Schematic Low Current Base Tech 3 5 39 2012 Midland Radio Corporation ...
Страница 62: ...5900 PARRETTA DRIVE KANSAS CITY MISSOURI 64120 PHONE 816 241 8500 FAX 816 241 5713 www midlandradio com ...