Reference Oscillator Warp - Motorola CDM Series Basic Service Manual

Radio Programming and Tuning Procedures
RF Band
UHF (403-470 MHz)
UHF (403-470 MHz)
UHF (450-512 MHz)
UHF (450-512 MHz)
(VMOS)
UHF (450-512 MHz)
(LDMOS)
VHF (136-174 MHz)
VHF (136-174 MHz)
LowBand (29.7-36
MHz)
LowBand (36-42 MHz)
LowBand (42-50 MHz)
*These values are up-to-date as of the print date. For the latest values and procedures, refer to the
Tuner online help.

4.4.2 Reference Oscillator Warp

This procedure affects all deviation values such as DTMF and MDC1200 signaling as the frequency
will drift if not warped properly.
Note: 1. Tuning of the PA BIAS must be performed first.
2. This operation should be performed prior to all other transmit tuning operations
to minimize heating and the impact of warp on signaling operations.
3. If the output power level is too low to measure the frequency, tune the transmit
power for the highest frequency first. However, if this is done, a wait period is
required to allow the radio chassis to cool down to approximately 25 °C before
setting the Reference Oscillator Warp.
Perform the oscillator warp procedure as follows:
1. Under the Tx Align menu, select Reference Oscillator Warp.
2. There is only one frequency point shown. This is always the last frequency point (F7).
3. Click on the slider thumb. Press PTT Toggle to key up the radio at the corresponding frequency
point.
4. Monitor the transmit frequency.
5. Adjust the slider, spin, or edit control until the frequency is as close as possible to the indicated
transmit frequency. Refer to values listed in Table 4-4. Press ENTER to confirm the selection.
6. Dekey the radio by pressing PTT Toggle.
7. Program the warp value into the radio by pressing the Program button.
8. Exit the reference oscillator warp function.
Table 4-3: PA Bias Specifications*
Voltage
PA Type
Value
25-40W 95
1-25W 95
25-40W 95
1-25W 95
1-25W 22
25-45W 85
1-25W 55
40-60W 63
40-60W 63
40-60W 63
Bias 1 Bias 2
Current Current
100-150mA 130-170mA
Not Used 130-170mA
100-150mA 130-170mA
100-150mA 130-170mA
Not Used 370-430mA
100-150mA 100-150mA
Not Used 80-120mA
100-150mA 100-150mA
100-150mA 100-150mA
100-150mA 100-150mA
4-5
Bias 3
Current
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
100-150mA
100-150mA
100-150mA