Dataradio Paragon, Техническое руководство

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120 20170-204a Paragon
PD
Technical Manual
38
6.2.3.4 Low Frequency Balance Adjustment
1. Apply the following settings to the IFR:
– Receiver mode and Oscilloscope display (Source: Demod Out Connector).
– IFR RX frequency to match the radio transmit frequency
– IF Filter set to 30KHz
– Zoom the Deviation window: select 10kHz Range and DC coupling.
2. Select the active or, the lowest (in the case of multi-channel base) frequency channel (via dip
switch)
3. Transmit a square wave by pressing the BDLC
PD
’s PF1 button and following the procedure out-
lined in section 3.2.1.1.2.2. Adjust RV-105 (REF MOD) close to the microphone connector, for
best wave shape; no damping, no overshoot. Record the deviation read.
4. If transmission has not ended by itself, press PF1 again to stop it. For single-channel unit, pro-
ceed to step 8.
5. For multi-channel unit, select the highest frequency channel. Transmit a square wave by pressing
the BDLC
PD
’s PF1 button and following the procedure outlined in section 3.2.1.1.2.2. Record
deviation again.
6. The difference in deviation between the two channels should be less than ±300 Hz. If not, re-
adjust RV105 to "average" the square wave shape on both channels until the spec is met.
7. To confirm the adjustment, select the active, or the lowest frequency channel. Compare the de-
viation produced between:
- 1000 Hz sine wave adjust tone and
- Random data
The difference should be lower than 300 Hz. For multi-channel unit, repeat this step on the high-
est frequency channel.
8. Select the active channel. Transmit a TX ON (Modulated) adjustment tone by pressing the
BDLC
PD
’s PF1 button and following the procedure outlined in section 3.2.1.1.2.2. Make sure that
deviation level read on the IFR correspond to model and bit rate in use (see Table 8 - Carrier de-
viations for Tone or Data Modulation). Re-adjust deviation as necessary referring to Checklist B
- page 28.
6.2.3.5 Exciter Power Output
1. Apply the following settings to the IFR:
-
Receiver mode, Output T/R
-
IFR RX frequency to match the main radio TX frequency
-
IF Filter set to 30KHz
-
Select auto range in the Power reading window
-
Connect the coaxial cable from the IFR T/R to the Exciter output connector
2. Key the Exciter by pressing the module PTT button. The output power must be:
- 800MHz (T881) = 4W ±300mW.
3. If 4Watts is not reached, adjust helical #L300 for maximum power output (which should be at
least 7W); adjust RV356 down to 4W.