For example, to work the UO-22 satellite:
From Table 2, note that Memory Channel 00 selects UO-
22 data frequencies.
1. Enter the SETUP menu and select SETUP #15 = ‘3’. This
action will configure the TR270 for separate transceiver
‘A’ and receiver ‘B’ antennas. Also, if using an in-line
70 cm preamplifier, select SETUP #01 = ‘1’ to enable DC
power to the ‘ANTENNA 2’ rear panel connector. Press
the
SETUP
D
button to exit the SETUP menu.
If the optional TNC270 is installed,
- Select SETUP #06 = ‘2’ (assigns the internal TNC270 to
receiver ‘B’).
- Select SETUP #07 = ‘0’ (no external TNC).
- OR -
If a properly wired external TNC is installed,
- Select SETUP #06 = ‘0’ (no internal TNC).
- Select SETUP #07 = ‘2’ (assigns external TNC to receiver
‘B’).
- Select SETUP #08 = ‘9600’ (9600 Baud data).
With the TNC properly installed and assigned,
2. Press the
6
SAT
button to enter the satellite mode. The
TR270 will display the factory programmed satellite
memories. Press the
/
buttons to select memory
‘00’. Refer to Figure 13.
3. Press the
P. OUT
C
button to select the required transmit
power level: Low, Medium, or High.
In the Satellite mode, transceiver ‘A’ displays the
transmit frequency, and receiver ‘B’ displays the receive
frequency. To alter the contents of a particular memory
channel, if desired, rotate the tuning wheel or press
NUM
*
followed by numeric frequency entry to tune either
transceiver ‘A’ or receiver ‘B’, as selected. Press the
A / B
A
button to select transceiver ‘A’ or receiver ‘B’, as
required. To store these new frequencies, if desired,
press the
STORE
#
button followed by the
3
MEM
button and
enter the desired 2-digit memory number using the
numeric buttons (this operation automatically shifts to
the NUM mode).
Additionally, the currently displayed frequencies may be
copied to the main VFOs in transceiver ‘A’ and receiver
‘B’ for use after exiting the SAT mode. With the frequen-
cies displayed in the ‘SAT’ mode, press the
STORE
#
button
followed by the
2
VFO
button.
To exit the SAT mode, at any time, press the
2
VFO
button.
Satellite Operation, continued 35
In SAT mode:
Lights to indicate
that scanning is
enabled.
Flashes prior to
receiver
acquiring lock.
Lights continu-
ously after lock
is achieved.
In SAT mode:
Indicates a relative
discriminatior
voltage. A count
of '50' indicates
that the receiver is
tuned exactly to
the satellite signal.
SAT mode permits
(00-99) SATELLITE
mode memory
channels.
Typical display in SAT mode
FIGURE 13
H
SCAN
SAT
DATA
N
XMT DCD CON
TX
STA
RX
MEM
A
B
Using the desired tracking software (Traksat, Wisp,
Instatrak, etc.), a determination of the satellite’s position
can be calculated. Some programs also indicate the
Doppler offset. If the tracking software that is being
used has this feature, tune receiver ‘B’ to the proper
frequency using the main tuning wheel.
At this point, note that the upper right MEM indicator has
changed to a relative tuning indication. Maintain this
number at a count of ‘50’ to keep the receiver cen-
tered on the actual downlink frequency of the satellite.
As the satellite passes, continue to tune the main tuning
wheel to maintain a count of ‘50’. If the count goes
above ‘50’ tune up in frequency. If the count goes
below ‘50’, tune down in frequency.