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because of a difference in their strengths, adjust the CW
sidetone level with the CW MONI
control, also located
under the access cover, until the strengths are the same.
WHEN
ALIGNING
THE
FREQUENCY,
DO NOT PUT
THE
UNIT
IN THE
TRANSMIT
MODE.
Be sure the T/R switch is in the Receive position, the VOX
switch is OFF, and that you do n&t touch the PTT switch
on the microphone.
5-7-5
SATELLITE
COMMUNICATION
At present Тћеге-аге two active satellites for amatuer radio
ІС-251А/Е
ог
ІС-260А/Е
5-7-6
ІОУ/ ВАМО
АМТЕММА
А single wire сап be used for receiving ВС signals, connect-
ing it to the LOW BAND ANT terminal.
However, this may
not be efficient for good reception.
So, make an antenna as
long as and as high as possible, and use an antenna tuner to
convert its impedance to 50ohms.
The connection is shown
below.
LONG WIRE
ANTENNA
Coax. Cable
ANTENNA COUPLER
use, though more are being planned.
AMSAT
OSCAR
7
was launched
in November,
1974, and AMSAT
OSCAR
8
was
launched
in March, 1978.
Satellite communications
can
be made by using ап ІС-251А/Е
or IC-260A/E
for
transmitting and the 1С-720А for receiving.
For operation,
and
frequency
information,
refer to the chart below.
Since
communication
satellites
are moving
at very
high
speeds,
the down-link
signals can
be heard
on a higher
frequency than the real frequency as a satellite approaches,
and on a lower frequency as it travels further away.
Further
information
on communicating
through satellites can be
found in various amateur radio books and periodicals.
АО-7 - АО-8 FREQUENCY
CHART
MODE A
UP LINK
DOWN
LINK
FREQUENCY
FREQUENCY
145.85MHz
29.4MHz
!
!
145.95MHz
29.5MHz
BEACON
FREQUENCY
АО-7
29.502MHz
АО-8
29.402MHz
5-7-7
RECEIVE
ANTENNA
TERMINALS
The
RECEIVE
ANT
IN jack is connected
to the input
terminal
of the receiving section, and the RECEIVE
ANT
OUT jack is connected
to the antenna connector through
the internal T/R antenna switching circuit.
These two jacks are normally jumpered
with a cable, but
can be used for:
TRANS
MITTER
Fig. 1
Connection of a pre-amplifier
ANTENNA
eos}
БЕЗ)
ФІМРОТ
TERMINAL
В OUTPUT
TERMINAL
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