TEX100
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User Manual
Rev. 4.0 - 18/07/03
Now measure the stereo separation with the Stereo Meas-Decoder, which, with a
400Hz signal, should be better than 45dB. Repeat the operation for the other channel.
To maximized the stereo separation, is possible acts on the compensator C41 (pilot
tone phase) and on RV6 (right channel separation) and RV7 (left channel separation)
trimmers.
10.1.2
VCO card adjustment (old version)
After having replaced the VCO Card and relevant connectors, carry out the following
procedure:
MONO VERSION
•
Connect an audio generator to the Mono input or MPX.
figure 10.2
•
Switch on TEX100, select a frequency at 98MHz and select 0dBm on the INPUT
LEVEL selector (pilot tone inserted).
•
Connect a 50 Ohm, 100 W dummy load to the RF output.
•
Connect the drawing of -40 dB to the input of the own modulation analyzer.
•
Inject a 400Hz, 0dBm (775mVrms = 2.2Vpp) tone into the Mono (or MPX) input.
•
Configure the FAM to measure deviation with the 30Hz-200KHz/FM/P+ filters
and check that it is 75KHz. If not, adjust trimmer R15 accordingly.
•
Verify correct value on TEX100's analog meter.
STEREO VERSION
•
Connect an audio generator to the Left and Right inputs (together)
•
Switch on TEX100, select a frequency at 98MHz and select 0dBm on the INPUT
LEVEL selector (pilot tone inserted).
•
Connect a 50 Ohm, 100 W dummy load to the RF output.
•
Connect the drawing of -40 dB to the input of the own modulation analyzer.
•
Inject a 400Hz, 0dBm (775Vrms=2.2Vpp) tone into Left and Right.
•
Configure the F.A.M. to measure deviation with the 30Hz-200KHz/FM/P+ filters
and check that it is 75KHz. If not, adjust trimmer R15 accordingly.
•
Verify correct value on TEX100's analog meter.
NOTE: The audio generator used in these tests must have a distortion figure better
than 0.01%. Perform this test at the operating frequency of the exciter.
Summary of Contents for TEX100
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