Ten-Tec JUPITER - Page 18

PBT (Passband Tuning) shifts the
receiver's passband up or down with
respect to the tuned frequency when the
PBT button is on. JUPITER displays
the PBT setting just below the first two
digits of VFO A. Start with PBT off.
The MULTI knob provides a means to
adjust any of a number of settings
selected by pressing a particular button.
For example, pressing AF allows the
MULTI knob to adjust the audio
(speaker or headphones) volume, while
pressing PWR causes MULTI to adjust
the transmit power level. The selected
function appears in the lower left-hand
corner of the screen as reverse-video
(light letteríng on a dark background)
and a bar graph illustrates the setting as a
percentage of full-scale. Settings made
using the MULTI control persist after
switching to another function, and after
you switch off the transceiver. Start
with MULTI controlling AF.
2.4.3. Top Row
Along the top of the panel, above the
radio display, are four push-on push-off
buttons.
ATTN (attenuator) reduces the RF gain
of the receiver by 20 dB in case of
overload by very strong signals. Тһе
attenuator is normally off.
Pushing SWEEP paints a snapshot of the
activity either side of the tuned
frequency. JUPITER mutes the audio for
а few seconds while painting the screen.
The horizontal dimension signifies
relative frequency and the vertical
dimension signifies relative strength of
the signals. Тһе width of the frequency
scan is selectable as an item on the MNU
screen. А vertical cursor on the display
follows the main tuning frequency as a
74269 Second Printing
JUPITER Model 538
30 August, 2001
aid for tuning to signals or clear spots as
desired. SWEEP is an alternate-action
key. See chapter 3 for more details on
this function.
The VOX key switches the control of
receive and transmit states between
push-to-talk and Voice-Operated-Xmit.
Three adjustments to this function are
available on the MENU screen, discussed
in chapter 3. Its operation is
conventional.
The TUNE button keys the transmitter
steadily in CW mode, regardless of the
selected operating mode. This produces
a steady RF carrier, useful for observing
the output power setting or adjusting an
external antenna coupler, Because
JUPITER will automatically shut down
if a badly mismatched load causes
excessive power supply current, it is
prudent to reduce power before
activating TUNE.
Be certain that a proper antenna or
dummy load 15 connected before
pressing TUNE, and avoid causing
interference to others.
Push the TUNE button to activate or
deactivate. When activated, the TUNE
legend will change to reverse video, the
S-meter reading will change to РУМК, ог
SWR, and the red TX LED оп
JUPITER's front panel will light.
2.4.4. Middle Row
Immediately below the display is a row
of 7 buttons, starting with the yellow
lettered ALT (alternate) button. Each of
the next six buttons has a primary
function, marked in white letters on the
button, and an alternate function marked
in yellow on the panel below. Tapping
the ALT button (no need to hold it)
temporarily re-assigns a selected button
2-3