UHF1(400-470MHz)
Tuning Description
34
6. Click the “Save” button to save your settings.
Modulation Balance
1. Connect the antenna connector of the radio with the HP8921, and set the
HP8921 to TX test mode.
2. Set the HP8921 parameters as follows:
IF Filter: 230 kHz
Filter 1: <20 Hz HPF
Filter 2: <15 kHz LPF
De-Emphasis: OFF
3. Open the Tuner software, go to “TUNER_DATA -> TX” and double click
“Modulation Balance” from the navigation tree on the left. Then select an
appropriate channel.
4.
Click the “Transmit On” button.
5. Adjust the value in the dialog box until the frequency deviation displayed
on HP8921 is 5 k±50 Hz.
6. Press the Enter key on the keyboard to confirm your settings if the value
is input via the keyboard. If the value is adjusted via the vernier, skip this
step.
7. Click the “Transmit Off” button.
8. Click the “Save” button to save your settings.
Transmit Oscillator
Voltage
1. Connect the antenna connector of the radio with the HP8921, and set the
HP8921 to TX test mode.
2. Open the Tuner software, go to “TUNER_DATA -> TX” and double click
“Transmit Oscillator Voltage” from the navigation tree on the left.
3. Click the “Save” button to save the existing value to the radio.
RX Section
Front-end Filter
1. Connect the antenna connector of the radio with the HP8921.
2. Connect the Audio Out port of the radio with the Audio In port of the
HP8921, and set the HP8921 to RX test mode.
3. Set the HP8921 as follows:
Output RF signal: -118 dBm/Frequency (current channel frequency)
Modulation frequency: 1 kHz
Modulation deviation: 3 kHz
De-Emphasis: 750 us
4. Observe the value displayed on the HP8921 and adjust the vernier until
the SINAD value is more than 14 dB.
5. Set the HP8921 as follows:
Output RF signal: -25 dBm/Frequency (current channel frequency:
-36.675 MHz)
6. Observe the value displayed on the HP8921 and adjust the vernier until
the SINAD value is less than 14 dB.
7. Press the Enter key on the keyboard to confirm your settings if the value
is input via the keyboard. If the value is adjusted via the vernier, skip this
step.
8. Click the “Save” button to save your settings.
Front-end Gain
1.
Connect the antenna connector of the radio with the HP8921, and set the
HP8921 to RX test mode.
2. Set the HP8921 to output -70 dBm/Frequency (current channel
frequency) unmodulated RF signals.
3. Press the Enter key on the keyboard to confirm your settings if the value
is input via the keyboard. If the value is adjusted via the vernier, skip this
step.
4. Click the “Save” button to save your settings.
Receive Oscillator
Voltage
1. Connect the antenna connector of the radio with the HP8921, and set the
HP8921 to RX test mode.
2. Open the Tuner software, go to “TUNER_DATA -> RX” and double click
“Receive Oscillator Voltage” from the navigation tree on the left.
3. Click the “Save” button to save the existing value to the radio.
Summary of Contents for PD502
Page 1: ...PORTABLE...
Page 5: ...VHF 136 174 MHz...
Page 13: ...VHF 136 174 MHz Exploded View and Packaging Guide 7 3 2 Packaging Guide...
Page 18: ...VHF 136 174 MHz Circuit Description 12...
Page 43: ...PCB 3 9 PCB VHF 136 174 MHz...
Page 44: ...PCB 3 VHF 136 174 MHz...
Page 71: ...UHF1 400 470 MHz...
Page 79: ...UHF1 400 470MHz Exploded View and Packaging Guide 7 3 2 Packaging Guide...
Page 84: ...UHF1 400 470MHz Circuit Description 12...
Page 108: ...UHF1 400 470MHz PCB 36 9 PCB...
Page 109: ...UHF1 400 470MHz PCB 37...
Page 136: ...1616300000260 2014 03 17 L07157 4...
