CALAMP WIRELESS NETWORKS INC. BDD4T83-2 ユーザーズマニュアル
120 20170-302
Paragon
PD
Technical Manual
33
Multiple channels (adjusting as shown for single channel above):
1. T881 (800/900 MHz) Adjust the VCO loop to 10V using the middle frequency channel.
2. T857 (UHF) Adjust the VCO loop to 10V using the middle frequency channel.
3. T837 (VHF) Adjust the VCO loop to 9V using the middle frequency channel.
All channels should lie within the upper and lower limits of 16V and 3V respectively for the
T881 and T857 or within 13V and 5V for the T837.
T881 and T857 or within 13V and 5V for the T837.
Note:
Normally, the fast TX key option is installed and the synthesizer is always ener-
gized. In the case where that option was not fitted, key the transmitter by pressing
the front panel Carrier button to make the above adjustment possible.
gized. In the case where that option was not fitted, key the transmitter by pressing
the front panel Carrier button to make the above adjustment possible.
5.2.3.3
TX Frequency Error Adjustment
1. Apply the following settings to the IFR:
-
Receiver mode
-
IFR RX frequency to match the main radio TX frequency
-
IF Filter set to 30KHz
-
Zoom the RF Error window: select 10Khz range
2. Key the transmitter by pressing the front panel TX-Key button and measure the carrier output
frequency. It should be within ±300 Hz. If it is not, adjust the TCXO (IC700) to trim to meet the
requirement, preferably within 100Hz.
requirement, preferably within 100Hz.
5.2.3.4
Low-Frequency Balance Adjustment
Note:
•
PGM800Win version 3.00 or later must be used for T881 adjustments and can also
be used to adjust T857 and T837 units. Electronic potentiometer (256 step) is used
to allow channel adjustment of two-point modulation (Low freq. balance).
be used to adjust T857 and T837 units. Electronic potentiometer (256 step) is used
to allow channel adjustment of two-point modulation (Low freq. balance).
•
PGM800Win version 3.00 or later must be used, if the unit serial number is longer
than 6 digits.
than 6 digits.
1. Apply the following settings to the IFR:
– Receiver mode and Oscilloscope display (Source Demod out connector, DC coupled).
– IFR RX frequency to match the radio transmit frequency
– IF Filter set to 30KHz
– Zoom the Deviation window: select 10kHz Range and DC coupling.
– 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 3.2.1.3 or run the Dataradio WinRIS program on the same computer if two serial
COM ports are available.
COM ports are available.
4. Press EPOTs button. Adjust IC220 via PGM800Win “reference modulation” to obtain the best
square wave, no damping, no overshoot. (You can use either the mouse or up and down arrow
keys). Record the deviation read.
keys). Record the deviation read.
5. If transmission has not ended by itself, press BDLC
PD
PF1 to stop it. For single-channel unit,
proceed to step 8.