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CHAPTER 4
OPERATING HINTS
4-1 INTRODUCTION
The following para-
graphs provide additional useful information
for getting the best performance out of your
PARAGON.
Also included is TABLE 4-1,
which provides trouble-shooting information
if you should ever have a problem.
4-11
СҰ
In the CW mode, the indicated
frequency is the received frequency. To accu-
rately read an incoming signal, therefore, it is
necessary to "zero-beat" the signal, not peak it
on the S meter.
This holds true no matter
where the OFFSET controls are set.
When transmitting cw, the actual trans-
mitted frequency is 750 Hz higher than the
displayed receive frequency. This is due to the
BFO shift necessary to bring the oscillator into
the filter passband. To accurately determine
the transmitted frequency, add 750 Hz to the
receive frequency, orif SPLIT VFO's are used,
add 750 Hz to the programmed transmit fre-
quency.
4-12
FM
The PARAGON
will operate
transceive + 5 kHz deviation FM with the
optional Model 256 FM Adaptor.
The PBT, Crystal Filter selection keys,
Noise Blanker, QSK and AGC switches do not
function in this mode.
If split Rx / Tx is desired when operating
thru repeaters, program the transmit and re-
ceive frequencies in VFO A and VFO B.
used has an output of 5 mV or less.
4.1.3 FSK (RTTY)
[ cw ]
Toenable the FSK mode, press the SHIFT key,
then the CW key. All mode LED indicators
will go out indicating this mode selection.
Required external equipment are a. tele-
typewriter or keyboard and a demodulator
(terminal unit) designed for 170 Hz shift with
2125/2295 Hz tones. Audio for the demodula-
tor may be taken from the AF OUT jack on the
rear panel.
The FSK keying should be connected to
the MARK / SPACE jack
(MARK:
0 to
-15Vdc, SPACE: +2.5 to +15 Vdc) and a sep-
erate T/R function is provided on the RTTY
KEY jack (ground to transmit).
AFSK operation is also possible by using
the AUDIO IN jack on the rear panel or the
MIC connector on the front panel.
4-14
PROTECTIVE
CIRCUITRY
4:
ALC
ALC serves three major functions: as-
sures maximum power from the transmitter
without critical adjustment of the input drive,
prevents the amplifier from being overdriven
into the non-linear, distortion-producing area,
and serves as a power limiting device which
protects the output transistors. It does the first
two very well, but the third only partially. To
protect the system, the PARAGON uses cur-
rent limiting circuitry which automatically
reduces the drive level if the current demand is
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