SECTION X
Appendix

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Tabel 10-1. Spectrum Analyzer Control Settings
ControlSetting
RF TEST OFF
INPUT ATTENUATORMaximum
CALL OSC LEVELOFF
IF ATTEN0 DB
SWEEP WIDTH SELECTORVAR (100 kHz)
AMPLITUDE SCALELOG
AFCOFF
CENTER FREQUENCYTo marker
GAINMaximum CW
OUTPUTAB
OUTPUT LEVEL DB BELOW METER READINGFor suitable modulation level of transmitter
FREQUENCY RANGEAs required
MAIN TUNINGAs required
OUTPUT LEVELRedline on meter

  2. Connect the transceiver PHONE PATCH connector to the spectrum analyzer two-tone generator front panel binding posts with test cable W7.

  3. Connect the transceiver ANT. RELAY and ALC jacks to the ANT. RELAY and ALC jacks on the RF amplifier with test cables W1 and W2.

  4. Connect the power supply 11-pin power plug direct to transceiver power connector.

  5. Connect the RF amplifier RF OUTPUT connector to one end of the coaxial T-connector; connect the oposite end of the T-connector to J2 on the directional coupler (mounted on rear of radio set control) with test cable W4 and W5.

  6. Connect J1 on the directional coupler to J1 on the Dummy load with test cable W6

  7. Connect the 6.3 VAC jack on the transceiver to J4 on the Dummy load with test cable W9

  8. Connect J3 on the dummy load to the 6.3 VAC jack on the radio set control with test cable W8

  9. Connect P4 of the test probe (supplied with spectrum analyzer) to the spectrum analyzer PROB POWER connector.

  10. Connect P3 of the test probe to the spectrum analyzer SIGNAL INPUT connector.

 

CAUTION

An input signal of less than 20 mv is sufficient for all normal measurements. To avoid damage to equipment, under no circumstances should a signal exceeding 3 volts be coupled to the SIGNAL INPUT connector.

l

Connect the 60-db attenuator head (supplied with spectrum analyzer) to the cathode-follower section of test probe. Connect the last probe tip (supplied with spectrum analyzer) to the 60-db attenuator head.

m

Connect the test probe tip to the junction of the T-connector. Connect the ground clip of the test probe to the ground side of the signal source

n

Connect the power input plugs on the RF amplifier, power supply, and spectrum analyzer to the 115-volt ac power source.

Tests on Amplifier, RF AM-3979/FRC-93

  1. Output Power Test in CW Mode.

    1. Connect the equipment as outlined in paragraph 10-4 and as shown in figure 10

    2. Adjust the amplifier and transceiver for 3.9-MHz operating frequency as outlined in paragraphs 2.1, 2.3, and 2.3,

    3. Set transceiver PLATE-GRID-ALC switch at ALC

    4. Set dummy load REMOTE-DUMMY-LOAD switch at DUMMY LOAD

    5. Set the radio set control WATT-METER switch at FORWARD 2000.

    6. Set spectrum analyze frequency output A for 1.0-kHz signal and frequency output B for 1.9 kHz signal. Set the output level for minimum.

CAUTION

Do not apply RF output to dummy load for more than 30 seconds at a time. To stop transmitting, remove ground from PTT jack.

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