Ten-Tec JUPITER - Page 22

| Еог example: а РХ station is
transmitting on 14.195 MHz and
listening for calls around 14.200. Tune
the main display frequency to the DX at
14.195. Tap Ше A=B key to set both
VFOs ағ 14.195. Select SPLIT
operation, then press and hold REV.
VFO A tunes the receiver on the split
(transmit) frequency while you hold the
button. Tune and listen around 14.200
to determine where to transmit. (You
might choose a relatively clear
frequency or you might choose to use
the same frequency as a successful
caller. When you release REV, the
receiver is back on the DX station's
frequency and the transmitter is ready on
the SPLIT frequency you chose by
monitoring in REV.
The optional Model 302J remote
encoder/keypad can also control REV.
RIT and XIT provide yet another way to
split frequencies in this versatile radio.
See paragraph 2.4.8.
2.5, RECEIVER OPERATION
JUPITER's receiver provides general
coverage reception from below 500 kHz
to 30.0 MHz. The BAND key cycles
through the amateur bands, but the
receiver will tune over its entire range
from any starting frequency,
automatically switching band filters as
necessary. All receiver features are
functional throughout the range.
2.5.1. Receive Filter Selection
JUPITER comes with 34 built-in receive
filters. To choose any filter, rotate the
BANDWIDTH knob (which is always
active). This updates the filter
bandwidth legend to the left of the
frequency display. Except for FM,
where JUPITER’s selectivity is fixed at
74269 Second Printing
JUPITER Model 538
30 August, 2001
15 KHz, all filter choices are independent
of mode.
2.5.2. Passband Tuning (PBT)
This is perhaps the most useful of all of
the receiver controls, especially in a
crowded band. Use the alternate action
PBT button to enable or reset passband
tuning. The PBT knob allows you to
move the receiver passband back and
forth across the desired signal. It can
“drop QRM off one side or the other” of
the passband. Adjusting it can often
improve the quality and intelligibility of
a signal. Note the PBT offset reading
below the first two digits of VFO A.
2.5.3. Audio and RF Gain Controls
Use the AF button and the MULTI
control to the left side of the graphic
display to adjust audio level. Push the
RF button to assign the MULTI control
to the RF gain function.
JUPITER's receiver design provides
good selectivity and dynamic range.
Under most conditions, leave RF gain at
100%. Should you experience receiver
overload, the RF gain control can limit
receiver distortion and/or overload
response in the presence of extremely
strong signals. There is also a
switchable 20 dB front-end attenuator
(see paragraph 2.4.3).
2.5.4. Automatic Gain Control (AGC)
The AGC button selects the decay time
constant of the AGC circuit. It steps
through FAST, MEDIUM, ог SLOW
settings by pushing the ALT+AGC
buttons. The current AGC setting
appears just above and to the right of the
VFO A readout.
2.5.5. DSP Noise Reduction
Pushing the NR (noise reduction) button
activates or deactivates JUPITER's DSP
noise reduction algorithm. This system
identifies desired signals mathematically
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