cM=**-"*****dl
Page
261
TRANSMITTING
Transmitter
Duty
Cycle
Restrictions
2.
Connect Tranceiver as in "Initial Actions" (Page
259).
The power transistors used in the power amplifier stage of
3.
Depress the PWR, TUNE, and ON buttons (this
is
the
this Transceiver are not as forgiving of overloading and LOW power output position).
misadjustment as vacuum tubes. The principal source of
difficulty is overheating. If you observe the duty cycle
4.
Advance the LEVEL control until you
get
a
parameters carefully, the transistors will last a long time; if meaningful SWR meter indication of forward power.
you ignore or abuse these parameters, costly replacement
will be required. Consequently, it
is
important that you
5.
Adjust the antenna coupler for minimum VSWR.
carefully observe the duty cycle restrictions in the following
table when using high power.
6.
Release the TUNE button.
NEVER EXCEED 30 SECONDS
WITH BOTH THE HI AND
7.
Turn the LEVEL control fully counterclockwise.
TUNE BUTTONS DEPRESSED.
NOTE: Use the following high power
steponly if the meter
MAXIMUM
does not show an adequate reading when in low power. If
CONT~NUOUS
high power
is
used, carefully observe the 30 second,
RECEtVE
TR~~M,T
high-power, TUNE duty cycle restriction.
MODE
TIME TIME TIME
Th
Depress the HI and TUNE buttons. Then quickly
SSB
2
units
1
unit
1
hour
3o
,..,;%
repeat steps
4
through
7.
Advance the LEVEL control
CW
1
unit
1
unit
15
,i
,;.
only enough to get useful VSWR readings.
TUNE
1
unit
5
units 30 seconds
A
53
%.
9.
Record the antenna coupler dial readings for the
EXAMPLES:
amateur bands of interest to facilitate future
1.
In CW,
a
one minute transmission should be followed
adjustments.
by
a
one minute receive period. In TUNE and
HI,
a
ten-second tune-up requires
a
50-second ~ff (receive)
NOTE: If you are adjusting an antenna coupler with a
1
period. receiver only, adjust the coupler for greatest S-meter
deflection.
2.
The on/off times
can
be
averaged
over several
transmit-receive cycles, but the maximum transmit
times must always be
observed. For instance, in the
CW mode you should only transmit half the time
SSB
(average) and should never exceed
15
minutes of
continuous transmission.
1.
Check the connections in "Initial Actions" (Page
259).
ANTENNA
COUPLER
2.
Depress the ALC, USE (or LSB), and ON buttons.
1.
If
you use an antenna coupler which has an WR
3.
For PTT (push-to-talk), use the switch on the
!
meter, connect
it
between the ANT socket on the rear
microphone to operate the transmit-receive relay.
panel and your transmission line with
RG-58AlU
coaxial cable.
4.
Set the BAND switch.
I
b
,
I
*
-7
9
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