General Dynamics C4 Systems URC-200 (V2)
111
NOTE
When measuring AM transmitter output power on the R2600 or on
any power meter that has a peak detector, which includes virtually all
of the portable inline or direct power meters, the carrier power that is
read on the wattmeter will need to be converted to average power to
verify compliance as indicated above. To convert carrier power to
average power use the following formula:
P
AVG
= P
C
[1 + (m
2
/ 2)]
where:
P
AVG
= Average Power
P
C
= Carrier Power
m = modulation as a decimal; i.e., 80% = .8
It should be noted, that in order to obtain the modulation value for the
above formula, the next step (c) will need to be completed.
c. Read the AM % modulation on the R2600 screen. Verify compliance with Table 1.
d. Depress the DISP key on the R2600 front panel. Move the cursor to the Meter position and
press the "EXT DIST" soft key.
NOTE
The “more” soft key may have to be depressed for the “EXT DIST” soft
key to be displayed.
e. Read the % of distortion on the R2600 screen. Verify compliance with Table 1.
f. Unkey the URC-200 (V2) and adjust it for HI POWER. Depress the DISP key on the R2600
front panel. Move the cursor to the Meter position and press the "RF DISPLAY" soft key.
NOTE
The “more” soft key may have to be depressed for the “RF DISPLAY” soft
key to be displayed.
g. Rekey the URC-200 (V2) and verify compliance with Table 1.
NOTE
When measuring AM transmitter output power on the R2600 or on
any power meter that has a peak detector, which includes virtually all
of the portable inline or direct power meters, the carrier power that is
read on the wattmeter will need to be converted to average power to
verify compliance as indicated above. To convert carrier power to
average power use the following formula:
P
AVG
= P
C
[1 + (m
2
/ 2)]
where:
P
AVG
= Average Power
P
C
= Carrier Power
m = modulation as a decimal; i.e., 80% = .8
It should be noted, that the modulation has to be measured in order to
obtain the modulation value for the above formula.
To Next Page
Loading...