Technical Manual

Table Of Contents

120 20170-201 Paragon

Technical Manual

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

’s PF1 button and following the proce-

dure outlined 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, proceed to step 8.

5. For multi-channel unit, select the highest frequency channel. Transmit a square wave by

pressing the BDLC

’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 deviation 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 highest frequency channel.

8. Select the active channel. Transmit a TX ON (Modulated) adjustment tone by pressing

the BDLC

’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 deviations for Tone or Data Modulation). Re-adjust deviation as

necessary referring to Checklist B - page 27.

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.