Yaesu FT-900 Operating Manual page 28

Operation
dial frequency (a g. o od way to confirm you are
usir~g
the reverse sideband).
0
To return the receiver to the default (upper) side·
band for CW reception, repeat the key sequence
(hold the FAST button while pressing CW).
~
Operating Hint - An additional benefit from this
feature is QRM rejection. If you have interference
on a CW station that the IF Shift control is ineffec-
tive on, try switching to the "reverse" sideband,
retuning the signal, and then try the IF Shift again.
AM Transmission
Transmitter output power in the AM mode is auto-
matically limited to 25 watts (carrier), and attempting
to adjust it fo r a higher level will have no effecl. After
setting the power level, you may you need to adjust the
MIC GAIN control to avoid overmodulating. This set·
ting will be lower than the optimum SSB setting.
0
The speech processor can be used in the AM
mode, bu t for now, make sure the PROC button is
off, so as not to confuse adjustments.
0 With the AM mode selected, press the PTT and
rotate the RF PWR control fo r the desired power
level (remember transmitter power o utput is limited
to 25 walls in the AM mode).
0
While speaking into the microphone adjust the MIC
GAI N control just to the point where the PO meter
indica tion begins to jump by 2 or 3 segments. Do
not set the MIC GAIN control further clockwise, o r
your signal will be distorted.
0
Reduce the RF PWR control, as necessary, for the
desired output leveL
See IF Processor Frequency Shift in the box on
p.2 1 to setting the speech processor for AM.
FM Transmission
Fo r FM transmission. the only control to be con-
cerned with is RF PWR. Microphone gain for FM is
preset internally and normally needs no adjustment
after leaving the factory. Adj ust the RF PWR control for
the desired output while transmitting. To avoid over-
heating, if you need full power, keep your transmis-
sions to tllree minutes or less, with the samE! time for
reception.
Repeater Operation
The FT-900 includes several features specifically
intended fo r repeater operation on 29-MHz FM.
To locate these repeaters, you can ask around the
calling channel (29.6 MHz) , or you may want to load a
block o f memory channels (page 27) with 20-kHz
Tuning Knob Torque Adjustment
II the tuning knob is too tight or too loose tor your
preference, and if you have a 2-mm hexagonal
d river, you can adjust the torque.
0
Pull the knurled rubber ring off of the tuning
knob.
0
Locate lhe hole in the edge of the tuning
knob, and use the 2· mm hexagonal driver to
loosen the setscrew accessible through the
hole, just enough to allow the knob to be
pulled olf the shalt.
0
Turn the exposed shaft tension spring counter-
clockwise to loosen the torque, or clockwise to
tighten.
0
Replace the knob, tighten the setscrew, and
replace the rubber
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