REPLACE FUSE AS
- RISK OF FIRE -
MARKED AFTER
DISCONNECTING UNIT
- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU SECTEUR.
CAUTION:
ATTENTION:
A N T E N N A 2
R E C E I V E O N L Y
V H F / U H F
I N T E R F A C E
R S - 2 3 2 C
F A X /
I N P U T
E X T E R N A L
T N C
D C I N P U T
1 3 . 6 V D C 6 A
+
5 0 / 6 0 H z
7 5 W A T T S
115 OR 230 VAC
SET INTERNALLY
FACTORY SET : 115 V
L I N E
F U S E
1 1 5 V
2 3 0 V
3 A , 2 5 0 V
S L O - B L O
T 1 . 6 A , 2 5 0 V
+ 13.6VDC
@
100 mA
F R O M A C L I N E .
+
G N D
S W I T C H E D
+ 13.6 V
5 0
@
FUSE
A N T E N N A 1
R E C E I V E : V H F / U H F
5 0
T R A N S M I T : 1 4 4 - 1 4 8 M H z
2 5 W A T T S
M A D E I N U . S . A .
BY
R
8
E X T S P K R
D E M O D
INTRODUCTION TO SATELLITE OPERATION
The TR270 supports both full duplex, packet data and
voice operation through the orbiting amateur satellites.
While most of these satellites travel in polar, low-earth
orbits, particular attention must be paid to the antenna
system for successful operation. In a polar orbit, as the
satellite traverses pole to pole, the earth will rotate
below. See Figure 8.
FIGURE 8
This will result in a particular satellite having two “good”
passes in a given 24 hour period over a given location.
For these “good” passes, simple ground plane type
antennas may suffice, although spotty operation due to
“nulls” in the antenna’s vertical can be expected. See
Figure 9.
Equator
Polar Orbit
(Approximately 100
miles altitude)
North Pole
Pass Z Pass Y Pass X
TR270
FIGURE 9
Turnstyle 2m
Antenna for Uplink
Receive Transmit
Turnstyle 70cm Antenna
for Downlink
Coaxial Cables
Coax carries
signal and
+13.6 VDC
power to
preamplifier
Preamplifier
Mast
FIGURE 10
Mast
SETUP #01 -
set to '1' (turns
+13.6 VDC
power on to
ANTENNA 2)
Earth's
Rotation
Satellite Operation 31