Sailor RE2100, Technical Manual

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3 SERVICE RE2100
3.6.3.1 CHECK OF TCXO
The TCXO signal is used as reference frequency in both PLL1 and PLL2, and it is also used as carrier
injection signal for both transmitter and receiver.
1. Turn the RE2100 on.
NOTE! The RE2100 must be on for at least 15 minutes before the check is carried out.
2. Connect the counter to TP4-3 through passive probe.
3. Check the frequency on TP4-3 to be 10.731520 MHz +/-1 Hz.
3.6.3.2 CHECK OF PLL1
The PLL1 consists of four independent VCO’s, which together cover the whole frequency band from 70
MHz to 100 MHz.
1. Turn the RE2100 on.
2. Connect the voltmeter to TP1-3.
3. Connect the counter to TP3-3.
4. Key-in the RX frequency and check the DC-voltage on TP1-3 and the frequency on TP3-3 to be
in accordance with table in point 5.
5.
6. Key in the RX-frequency and check the DC-voltage on TP1-3 and the frequency on TP3-3 to be
in accordance with point 7.
7.
8. Select RX-frequency 2225.4 kHz and measure the frequency on TP3-3.
9. Select RX-frequency 2075.3 kHz and measure the frequency on TP3-3, then subtract it from the
frequency measured in check point 8. The result must be 150.100 kHz +/-2 Hz.
10. Connect the voltmeter to TP3-3 through diode probe.
11. Select RX-frequency and check the voltage on TP3-3 to be in accordance with point 12.
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