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Alignment Procedures
Low Current Base Tech 3.5
EXCITER (TX MAIN UNIT)
1) FVR201 Sub-Audible Modulation Balance
This potentiometer sets modulation balance below 300 Hz. Carefully align this potentiometer to obtain
flat deviation from the lowest to the highest frequency programmed in the transmitter.
2) FVR202 Sub-Audible Modulation Deviation
This potentiometer determines low frequency (below 300Hz) deviation. When POCSAG and DCS are
used, it may be necessary to readjust to have enough deviation and fidelity at lower frequencies.
FVR201 and FVR202 are used together to adjust amplitude and fidelity of square wave output of the
transmitter in Analog Mode.
3) FVR203 Carrier Frequency Trim
This potentiometer adjusts carrier frequency. Its range will allow for +/- 200 Hz adjustment from the
desired (programmed) frequency.
4) FVR204 Exciter Output Power
This potentiometer adjusts the exciter’s output power level. This is nominally 80 mW.
5) L303
VCO
Alignment
The VCO has already been aligned at the factory. However, if you need to re-adjust VCO after a repair,
set the VCO voltage to 10.5 V at TP301 at the highest end of the sub band using L303.. This part can be
found beneath the cover. See Figure 2.
Note that tuning slug may be glued and breakage could
occur.
FVR201
Sub-Audible
Balance
VCO L303
(under cover)
TP301)
FVR204
Output Power
FVR203
Frequency Trim
FVR202
Sub-Audible
Deviation
Figure 2: Exciter Module (TX Main Unit) Alignment Adjustments
© 2012 Midland Radio Corporation
8
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 ...
Страница 42: ...THIS PAGE INTENTIONALLY LEFT BLANK 2012 Midland Radio Corporation 38 ...
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 ...