Motorola Solutions Inc. 92FT4843 用户手册

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December 1, 2000

68P81093C75-O

Required Test 
Equipment

The following test equipment is required to properly tune the 
preselector assembly:

RF Signal Generator: Motorola R2600 
Communications Analyzer, R2001 
Communications Analyzer (see note), or 
HP8656A signal generator (or equivalent)

Dip/Peak Monitor: HP435B Power Meter (or 
equivalent) with HP8484A sensitive power head, 
Boonton Model 92E with BNC input, or R2001/
R2600, using the spectrum analyzer function.

Torque Driver, capable of delivering 12 in. – lb. of 
torque, and 10 mm deep well socket.

Tuning probe: Motorola Part number 
0180763D22, part of TRN7799A tuning kit.

Flat-blade screwdriver

NOTE: The R2600 Communications Analyzer can both 

generate and measure simultaneously. The R2001 
may be used for either the generator or monitor 
function, but not both simultaneously. When using 
the R2001 as a signal generator, RF signal must be 
taken from the antenna port.

VHF Tuning Procedure 

Use one of the following two methods to calculate the alignment 
frequency to be generated by the signal generator.

For stations with a single receive frequency, calculate the frequency 
of the alignment signal as follows:

Step 1.  From the site documentation or the RSS, determine 

the station receive frequency.

Step 2.  If the frequency is 

≤

 148 MHz (Range 1) or 

≤

 156 

MHz (Range 2), subtract 250 kHz. Otherwise, note the 
actual frequency.

Example: If the station receive frequency is 134.575 
MHz (Range 2), subtract 250 kHz, since the frequency 
is less than 143 MHz.

134.575 MHz - 250 MHz = 134.325 MHz