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Paragon-III User Manual
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6.2 Transmitter Radio Tuning
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This section covers the basic Series II base station 700MHz transmitter radio module and PA
radio tuning and verification.
Note:
Usually, this section is never done unless called for in section 6.1 “Series II - Radio Pro-
gramming” or in
Table 21 - Checklist B (General)
“Checklist B” (General).
6.2.1 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)
6.2.2 Transmitter Module (T881-10-02200)
Note 1: Refer to Figure 24 (T881).
Note 2: When the synthesizer is unlocked, the front panel green LED called "Supply" will flash indi-
cating that it needs re-tuning.
Warning:
The LED will also flash when the unit is in setup mode while connected to the PGM800win program.
6.2.2.1
Initial Setup
1.
Shut down power to the base station.
2.
Prepare the Multimeter to DC Volts.
3.
Remove the exciter (T881) module from the base station rack frame.
4.
Remove the exciter top cover (nearest the handle).
5.
Connect a 3 feet long double shielded cable (N-M to BNC-M) between the IFR T/R output and
the exciter antenna connector.
6.
Connect the Paragon-III Extender Rail Kit to the empty chassis exciter slot.
7.
Apply power to the base station.
6.2.2.2
Synthesizer Alignment
Single channel: Connect the Multimeter to either side of L309 (T881).
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T881 (700 MHz) Tune VCO trimmer CV300 for a synthesizer loop voltage of 10V DC.
