Yaesu FT-227RB Instruction Manual page 22

counter
clockwise clockwise
Front View
counter
clockwise clockwise
Rear View
Figure 7
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(5
tit
(5
(SI
1-- I- I- I-
TP,
T201
Q102
L104
T101
VR202
Q103 -
Q215
Q216
VR201 1
VR209
VR207
VR208
VR205
VR203
L101
VR102
VR103
T102
VR1
01
Front View
Microphone
Receptacle
PERFORMANCE CHECKS
Make all performance checks at 13.5 Volts DC
(under load).
Check the transmitter output as follows:
(a)
Connect a suitable 50 ohm dummy load/RF
wattmeter to the ANT receptacle.
(b)
Set the channel selector to any channel and
key the transmitter while observing the power
output. The power should be approximately
10 watts, and the S-meter should read be-
tween 6 and 8 relative power output.
Check the receiver sensitivity as follows:
(a) Connect an AC VTVM to the SP receptacle,
and set the SQUELCH control fully counter-
clockwise.
(b) Connect the RF output of a precision VHF
signal generator to the ANT receptacle and
with no signal input note the VTVM reading.
Adjust the VOLUME control and VTVM
range, as required, to obtain an approximate
full scale reading. (DO NOT change the
VOLUME control setting after this adjust-
ment is made).
(c)
Set the signal generator to the receiving fre-
quency of the transceiver and adjust the
output amplitude of the signal generator until
the VTVM reads 20dB (1/10th voltage) lower
than the reading in step (b). The signal gene-
rator output voltage at this point is the
20 dB quieting sensitivity, and should be
approximately 0.3
µV.
ALIGNMENT POINT
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