120 20191-001
Paragon-III
Technical Manual
25
5.2 Series II Radio Tuning
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This section covers the basic Series II base station 700MHz radio modules radio tuning and
verification.
Note: Usually, this section is never done unless called for in section 5.1 “Series II - Radio Pro-
gramming” or in
Table 4 - Checklist B (General)
“Checklist B” (General).
5.2.1 Test Equipment
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Digital Multimeter & probes (e.g. Fluke 77)
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1 HP 34330A Shunt 30A (UHF only, used for transmitter current measurement)
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Digital or Analog calibrated Oscilloscope & scope probes (X1, X10 selectable)
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Calibrated COM-120B (.001ppm OCXO and 30kHz IF options)
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3-foot length of double-shielded N-M to BNC-M cable (RG-214 or RG-223)
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2x 'BNC' to 'N' type adapters (e.g. Amphenol, Greenpar).
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Bird RF power meter with 150W / 50 ohm dummy load (optional)
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3dB 150–watt attenuator
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1x Torx screwdriver #T-10 and #T-20
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Pozidriv screwdriver #1 & #2
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1x Six-inch adjustable wrench
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RF tuning/trimming tools.
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Extender Rail Kit for Series II chassis (T800-13-0000)
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1x 6" coax cable N-M to BNC-M (comes with the radio to connect the exciter to the PA)
5.2.2 Receiver module
Note 1: Refer to Figure 20 (T885)
Note 2: When the synthesizer is unlocked, the front panel green LED called "Supply" will flash
indicating that it needs re-tuning.
Warning,
The LED will also flash when the unit is in setup mode while connected to the
PGM800win program.
5.2.2.1 Initial Setup
This initial setup will be used during all receiver alignment procedures described below:
1.
Remove the receiver (T885) module from the Paragon-III rack frame
2.
Remove the receiver top cover (nearest the handle).
3.
Connect the Paragon-III Extender Rail Kit for Series II to the empty chassis receiver slot.
4.
Prepare the Multimeter to DC Volts.
5.
Apply power to the Paragon-III.
5.2.2.2 Synthesizer Alignment
Single channel: Connect the Multimeter to either side of L504 (T885) in the VCO (this measures
the synthesizer loop voltage).
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T885 (800/900 MHz) Tune VCO trimmer CV500 for a synthesizer loop voltage of 10VDC.
