TM 11-6625-2837-14&P-7 TECHNICAL MANUAL OPERATOR'S ...

Section 4 TM 11-6625-2837-14&P-7
4-9. FREQUENCY RANGE
PERFORMANCE TESTS
SPECIFICATION:
1 to 1299.999999 MHz selectable in 1 Hz steps. Frequencies from 200 to kHz to 1 MHz may also be selected with some
degradation in specifications.
DESCRIPTION:
The Synthesized Signal Generator System RF OUTPUT is monitored by a frequency counter which supplies a common
time base reference signal. The frequencies are checked at the extremes. Any specified frequency may be checked.
EQUIPMENT:
Figure 4-1. Frequency Range Test Setup
Frequency Counter... .................................HP 5340A
10 dB Fixed Attenuator ..............................HP 8491A Opt 003
NOTE
In the following procedure, allow for accuracy of counter used. -Model
recommended is specified at +1 count.
1. Connect frequency counter 10 MHz output reference signal to mainframe EXT REF input as shown in Figure 4-1
and set mainframe rear panel REF switch to EXT.
2. Set the RF Section OUTPUT RANGE switch to 0 dBm; set the VERNIER control full CW.
3. Set mainframe center frequency to 1.000 000 MHz and check RF section output frequency with counter. Record
the frequency.
0.999999_______________________1.000001 MHz
4. Set mainframe center frequency to 1299.999 999 MHz (Option 004 mainframe set to 1299.,space 9999 MHz) and
check RF Section output frequency with counter. Record the frequency.
4-2
1299.999 998________________1300.000 000 MHz