General Dynamics C4 Systems URC-200 (V2)
143
Warp adjust procedure.
This procedure places the transceiver into the remote command mode until the user
releases it from that mode by cycling power. The front panel display will be locked to the
current value while in this state.
1. Type ?14.
The radio will enter the remote command mode and return a warp value in the form
Waaaa where aaaa is a four-digit number between 0000 and 1023.
2. Record this value. __________ This is W
a. Include leading zeros, if any.
3. Type Waaaa (Upper-case W followed by the four-digit value just recorded.) the
transceiver will enter the Warp Adjustment mode and the current frequency will
change to approximately 400 MHz but nothing on the display will change to
indicate this.
4. Key the transceiver and record the frequency. _______________ This is f
a
.
5. Type ?14 again to confirm the warp value.
6. Substitute the values for W
a
and f
a
in the following formula:
W
b
= [(400,000,000 – f
a
) * 0.11] + W
a
7. Solve for W
b
. Round to the nearest whole number and record. __________
8. Type the resultant value for W
b
using the terminal emulation application. Use the
form Wbbbb. Remember this is a four-digit number so use a leading zero if
required.
9. Key the transmitter and measure the frequency. It should be within 1ppm at 400
MHz.
10. If it isn’t, repeat the process using the new values for f
a
and W
a
.
11. When the transmit frequency is within specifications, cycle power to the
transceiver to return the radio to the normal operating mode.
12. Key the transceiver and measure the frequency. If it is within specifications, the
procedure is complete. If not, contact General Dynamics technical support.
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