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(1)
Set the Receiver controls as follows:
Power
Gain Mode
Detection Mode
BW
BFO
(2)
Disconnect W6P2 from J5 on the A4 module.
(3)
Using the 50 ohm adapter, connect the digital frequency counter to W6P2 to
monitor the BFO frequency.
(4)
Using the Receiver front panel controls, select each BFO indication listed in
BFO indicator column of Table 3-2 and verify the frequencies listed in BFO
frequency column are obtained.
(5)
Select USB and LSB modes and observe the BFO frequency is 455.000 kHz.
(SSB/ISB Receivers fitted with 08409 and 08410 option filters only.)
(6)
Disconnect digital frequency counter and reconnect W6P2 to J5 on the A4
module.
BFO
INDICATOR BFO FREQUENCY
0.00 kHz
+1.11
2.22
3.33
4.44
5.55
6.66
7.77
7.88
7.99
g.
Audio Output Power.
This test requires the digital frequency counter and the RF signal generator listed
in Table 1 -2.
(1)
Disconnect distortion analyzer and connect digital frequency
counter to AF LINE output.
(2)
Set Receiver controls as follows:
Power
Gain Mode
BW
Detection Mode
Receiver Tuned Frequency 1.5 MHz
BFO
(3)
Set the RF signal generator for an output of 1.5 MHz at –97 dBm, CW.
(4)
Tune the RF signal generator (or Receiver) to produce an AF outp ut of 1.0
Racal RA6790/GM Alignment & Tuning Manual
ON
AGC-SHORT
CW
3 kHz (or closest bandwidth available)
ON (word BFO displayed in Mode LCD)
TABLE 3-2.
BFO
-1.11
-2.22
-3.33
-4.44
-5.55
-6.66
-7.77
-7.88
-7.99
ON
AGC-SHORT
3 kHz (or closest BW available)
CW
+1.00 kHz
TEST RESULTS
455.000 kHz
453.890
452.780
451.670
450.560
449.450
448.340
447.120
447.010
456.110
457.220
458.330
459.440
460.550
461.660
462.770
462.880
462.990
Page 16 of 20
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