Ten-Tec PARAGON User manual

:
OW NINE S
MB NT 1 5418
PARAGON
MODEL 585
ALL BAND HF
. TRANSCEIVER

TABLE OF CONTENTS (continued)
PARAGRAPH
PAGE
3-5.3
АМТЕММА..........Л...41.2022.2.2.Ҙ0ҮТ0Т4(
186141111111.
4161016
енен
3-13
3-54
RECEIVE
АМТЕММА...................2..2.0.4.Ү.ТҮ3О44.44.4
8:46)
44400440.
0.505
тн
3-13
3-5.5
CW
SIDETONE
...............
eren
eere
ntt
Алы
нн
3-13
3-5.6
VOX
CONTROLS
.............
eret
ennt
нн
3-13
3-5.7
SSB
MONITOR
LEVEL
..................
eere
entente
ennt
кене
кеннен.
3-13
3-5.8
ВЕЕР/УОІСЕ..................2.1.1.2.2.
2.
ə
ntn
nnns
tnen
нинин
н
nti
nnne
nnne
tnt
itte
inen
енен
3-13
3-59
КЕҮ..............................
—
À
PP
3-13
3-5.10
XVRT
EN/XVRT
ОЧОТ...
nennen
nnnm
nn
ее
3-13
3-5.11
AF
OUT............
eere
eerte
һы
tnus
ыы
enean
thao
toto
не
не
е
ененнен
ннн
an
некен
3-14
3-5.12
TX
ЕМ/ТХ
OUT
E
——————
3-14
3-5.13
PTT
RR
ыы
ыы
лылы
ы
ылы
елка
нен
кен
келеке
кен
кеннен.
3-14
3-5.14
AUX
13.8
RR
3-14
3-5.15
AUDIO
ІМ.......
нення
3-14
3-5.16
EXT.
SPKR
....4.4......1...202гҺ1т.Үт
Һ.Т.Һ7ҺМ.410220222.2.21.28.(4
22.2.
0).
ненен
d
3-14
3-5.17
ЕБІ.АҮ................................1....
м5.
0...
B
TEE
3-14
3-5.18
RTTY
KEY
..........
ання
3-14
3-5.19
MARK/SPACE
...............0.2..4.
2.2...
алыл
нання
3-14
4. OPERATING HINTS
4-1
ІМТЕОООСТІОМ............02020Д24
әаааоңңң
қаба
.-ыШ.әмаеем.
4-1
4-11
CW
ARR
4-1
4-12
FM
RR
нини
4-1
4-13
FSK
(RTTY)
.............
reete
enhn
rnt
tns
898
4.өлхен
4-1
4-14
PROTECTIVE
CIRCUITRY
&
АІС...
ння
4-1
4-1.5
SOLID
STATE
POWER
AMPLIFIERS
.................
enne
4-2
4-16
BROADBAND
vs
RESONANT
TANKS
.............ӛ.0.0.20.2.
!0..
а
6а
рр
4-2.
4-7
5УК-ТуоКілб5.................2.2212і)
бі...
əл.
лене
еее
нен
енемнен
4-3
4-18
EFFICIENCY
..............4.....(.Т
əл
лə
netten
лылы
ы
ен
не
ннен
ннен
4-3
5. OPTIONS INSTALLATION
5-1
INTRODUCTION,
...............
eret
nn
nnne
totns
en
nene
нн
5-1
5-11
REMOVAL
OF
ТОР
&
BOTTOM
COVERS
................
entere
5-1
5-12
"MASS
TERM"
CONNECTORS
...............
eene
nennen
енен.
5-1
5-13
CRYSTAL
FILTERS
................
entente
ener
nnne
nnn
еке
ntn enn
кенен
те
кенен,
5-1
5-1.4
VOICE
ЕЕВАОООТ..............1.......2.2...1.4200.-0.7ф4.8.Ү.4Һ2-..1
06
кек
кент
екен
нн
нн,
5-1
5-15
ЕВ5232ТМТЕЕҒАСЕ.............2..2...
м...
nnne
nennen
ennt
nnne
ene
енен
севе
5-2
5.1.6
FM
АРАРТЕК..............әыөөөөөнөөөөөнөнөнөнөнөнө
нене
ннөннненө
5-3

TABLE
ОҒ
CONTENTS
ARAGRAP
PAGE
LIST
OF
ILLUSTRATIONS
.........
NIMM
LIST
OF
TABLES
..........................ь.қһккнемеемене
MENOR
ERE
INTRODUCTION
onm
—€—————————
áo:
UNPACKING
————
анна
ТРЕ
SPECIFICATIONS
.........
/——
ERREUR
Ema
ix
1. INSTALLATION
1-1
INTRODUCTION,..............
enero
ннн
tnt
tkt
еее
кек
нек
нн
кн
кк
кке
en
senta
errato
ato
1-1
1-2
FIXED
STATION
&
MOBILE
...................
nennen
nennen
nennen
nennen
nennen
nnn
1-1
1-3
POWER
SUPPLY
...............2.2.1..2.2т...Д..ə
nonne stato
tnt
nn
than
atn
tates
кек
00000000000
елене
ет
1-1
1-4
ANTENNAS
.................1МгҮ2МЛҮ1....2..
1.0.
əле
нынын
ннен
1-2
1-5
MICROPHONE
............4.4.4..4..2.21.
əл.
еб.
nnne
nnno
h
tht
енене
ненен
ткен
еее
ен
кеннен.
1-2
1-6
КЕҮ.........................
өк
көленке
EE
1-2
1-7
СЕООУМЫ............2..02020.421.2..).
.0.
ОО
нек
кемек
ннен
ннен
1-2
1-8
BATTERY
ВАСКОР.........2..2иәеееееееенееенееевеееееееевее
ненен
1-2
2.
CONDENSED
OPERATING
INSTRUCTIONS
2-1
ІМТВОРОСТІОМ......
«анна
2-1
2-2
SELECTING
FREQUENCY
................22222.
4.0.40
олы
нання
2-1
2-3
INITIAL
FRONT
PANEL
SETTINGS
......
ання
2-1
2-4
TRANSMIT
...........
ener
ent
м
tnn
tne
th
th
ah
saneta
tn
san
кн
некен
енен
ннен
немен,
2-2
3.
DETAILED
OPERATING
INSTRUCTIONS
3-1
KEYPAD
FUNCTIONS
..........1
entrent
nennen
nennen
nnn
tnn
ненен;
3-1
3-11
SELECTING
MODE
..........
еее
енен
неее
tn
nnn
ennt
нн
3-1
3-1.2
CRYSTAL
FILTER
SELECTION
..................
eren
3-1
3-13
TUNE
...............2.222..2...
neat
stata
кке
кене
нее
нен
sonata
sana
sh
seb
нн
ннен
еее
ннен
нн.
3-1
3-14
RECEIVE
&
TRANSMIT
OFFSET
................
nennen
nnns
3-1
3-1.5
ПІ8РІ,АҮ.......02Д42Л
ы
-а---әе---.......м...
3-2
3-16
ҮУСОІСЕ..................2221..
221.
л
алал
кекке
кенеттен
кенен
кен
еккен
өн
еее
3-2
3-17
5РОТ.............0..0..4М..22Г20.ҺӘЦ2Д2..0.222.100..51
4...
....1
анн
н
ы
кн
кин
енемен
мн
3-2
3-18
VFO
SELECTION
.........1.1...ə...
ыы
беле
еее
нек
nnt
кекете
етекте
ее
еее
кекке
ен
3-2
3-19
TUNING
КАТЕ8........................0....4422
бə
б.
ыы
Аллен
onte
tn
ененнен
3-2
3-1.10
TEN
Hz
ПІЗРІ.АҮ...................2.........
24
4
1.1.222.00С(<өө
е...
3-2

TABLE ОҒ CONTENTS (continued)
PARAGRAPH PAGE
3-11 TUNING KNOB LOCK u. 3-3
1.32. DEWN/IUP APEE EEEE IEE нн майна ызаа ыа дында er Шааны 3-3
ссу MEMORIES нні A aneii So EaR ONANAN ENEA ESRAR 3-3
>41 MEMORY STORE ua 3-3
КЕ n s 9 od: 0 ———————— 3-3
Sub ТАМЫ SERT RM ae oem RTT Peete od ai id D SENDE REN RM 3-3
$24 MEMORY TUNE ы сынын наан otia samt айныйды 3-4
3-25 SCRATCH PAD MBMQR V... сс rennen 3-4
2-6 МЕМЮОЖТАСАМЫ5555 55-ы “ж..овввквныкыя 3-4
x soo чому итинник неран берери айай анмен нан рр ерак 3-5
ЖАЗ MEMORY LOCKOUT ee 3-5
ЖЫР MEMORY LOCK CLEAR see 3-5
>2.10 GLOBAL EOCKOUT- ————— 3-5
3-2.11 GLOBAL ОСК СТАВ. iniii SS 3-5
ЗОЛ МЕМО СТ ВАК... ———————————— 3-5
3-3 CLOCK-CALENDAR & SYSTEM ЕОМСТІОМ ............................................ 3-5
3:31 ЗВТ. RR: 3-5
$232 CUODUR SIDE, О нанні 3-5
333 DAIBSBELD. ntc ri нинин наннын ааыа EVERY ELA IRA VE 3-6
3-34 SYSTEM VERSION NUMBER —— 3-6
>33 SYSTEM RESET SWITCH. euer 3-6
34. FRONT PANEL FUNCTIONS. аннин наа A S A 3-7
3-4.1 DISPLAY AREA сонна 3-7
342 АЕСАШ/ТОМЕ;;..;»»».Ң““<ы-<<ыөс-сыссрысыыыы анкетаны 3-7
3-43 METER & ӚУУІТСН................................... еее еее тектен кекке кенен некен 3-7
3-46 NOISE BLANKER ———————— 3-7
3-4.5 ATTENUATOR V———————— 3-7
3-4.6 BPF/FADE — ———————— нын 3-7
3-47
РВТ/ЛЮТСН..................Ӛ.ӚӚ2-енменменкеск
нене
3-7
3-48
МІС/КЕРУЕ..............................4
чеснок
кке
кекке
кен
кене
»
3-8
3-4,9 PROC o ————— nee 3-8
3-4.10
RE/SQL
.....sssuenennssnsesnenssseonsnssssnsnaunssnusassnssnsssenessnasenenasensnnanasnnnusnssnenseseee
3-8
3-4.11
AGC
FAST/SLOW
&
ON/OFF
.......................ү....
«бл
меннен
кеннен
3-8
3-4.12
УОХ/РТТ..............ӛ.42.................024020.Ҙ.
.0442042...2.....С-С
ыы
ыы.
3-9
3-4.13
QSK
ЕА5Т/5І.ОУ/........................
Х92
4100
ен
не
енеке
кент
3-9
3-4.14
РҮҰЕ.......................................2....1...0<4
444.
өн
нн
ммен
3-9
3-4.15
PHONES
....................................
1.1.1
әкеме
мекеннен
некен
ннен,
3-9
3-4.16
MIC
..............1....1.1.
———————
——
3-9
3-5
REAR
PANEL
ЕОХСТІОМ8...................444З..4Ш.440.4..0Т.90.00000-”Ю”“.
ы...
3-13
3-5.1
POWER
SOCKET
...................
һо...
нан
ння
3-13
3-52
GROUND
POST
...............
erret
nenne
tnnt
2
Алы
нання
3-13

INTRODUCTION
The PARAGON is a microprocessor
controlled HF transceiver designed for the
active, serious amateur. Incorporating the
latest digital technology, the PARAGON fea-
tures direct keypad frequency entry, dual digi-
tal VFOs, 62 memories (which store fre-
quency, mode, VFO selection, I-F bandwidth,
and a seven digit alphanumeric tag), memory
scan (with channel lockout), memory tune vía
the main tuning knob, and all solid state design
including the broadband "no tune" final power
amplifier.
The PARAGON covers all amateur
bands using CW (with full or semi break-in),
SSB (with built-in speech processor), RTTY
(true FSK or AFSK), and optional FM.
The general coverage receiver tunes
from 100 kHz to 29.999 MHz and includes
AM reception.
Chapters 1 and 2 of this manual cover in-
stallation and basic operation of the trans-
ceiver in order to quickly place the PARA-
GON into operation. Chapters 3 and 4 provide
a more detailed description of the
PARAGON's features, controls, and
operation. Chapter 5 describes the options
available for the PARAGON and how they
should be installed. Chapter 6 is the technical
reference section and contains detailed circuit
descriptions, circuit board pictorials and sche-
matic diagrams.
UNPACKING
Examine your Model 585 PARAGON
for signs of shipping damage. Should any
damage be apparent, notify the delivering
carrier or dealer immediately, stating the full
extent of the damage. Retain all damaged
cartons. Liability for shipping damage rests
with the carrier.
It is recommended that you keep the
shipping carton and fillers in the event that
storage, moving or reshipment becomes nec-
essary. Ап accessory packet, warranty card,
and manual are packed with the PARAGON.
Make sure that you have not overlooked any-
thing.

GENERAL
FREQUENCY RANGE
FREQUENCY CONTROL
FREQUENCY READOUT
FREQUENCY STABILITY
ANTENNA IMPEDANCE
POWER REQUIRED
SPECIFICATIONS
Receive: 100 kHz to 29.9999 MHz Transmit: Standard Ham Bands
160M — 10M (Note: For operation outside Ham Bands contact factory.)
Microprocessor controlled digital PLL synthesizer. 10 Hz resolution.
7 digit 10 Hz fluorescent readout.
Worst case, 1 PPM per degree C. at 29.999MHz.
500 unbalanced.
Receive = approx. 1.5A. Transmit = approx. 20 A. @ 13.8 VDC.
CONSTRUCTION Rigid aluminum chassis. Extruded aluminum front panel. Textured top and
bottom, snap up stainless steel bail.
DIMENSIONS HWD 5-3/4" x 14-3/4" x 17"—14.6 x 37.4 x 43.2 cm.
NET WEIGHT 16 Ibs.—7 25 kg.
TRANSMITTER
MODES USB, LSB, CW, RTTY (FSK or AFSK), (FM optional).
DC POWER INPUT
RF POWER OUTPUT
MICROPHONE INPUT
T/R SWITCHING
CW SIDETONE
SSB GENERATION
CARRIER
SUPPRESSION
UNWANTED SIDEBAND
SUPPRESSION
SPURIOUS OUTPUT
METER
CW OFFSET
FSK SHIFT
Maximum 200 watts @ 14 VDC СУУ, SSB, (FM). 100% duty cycle for up to 20
minutes. Continuous with auxiliary air cooling.
25 to 100 watts adjustable with front panel RF PWR control.
High/Low impedance. Four pin, front panel connector accepts microphones
with 5mV (-62 dB) output. Polarizing voltage is provided for electrets.
VOX or PTT on SSB. Switchable FAST or SLOW QSK on CW.
Internally generated, adjustable tone and volume independant of AF GAIN
control.
9 MHz, 8-pole crystal ladder filter. Balanced modulator.
60 dB typical.
60 dB typical at 1.5 kHz tone.
More than 45 dB below peak power output.
Switchable forward power, SWR, collector current, audio processing level.
750 Hz automatic.
170 H2.

RECEIVER
MODES
SENSITIVITY
SELECTIVITY
ATTENUATOR
I-F FREQUENCIES
RX ANTENNA INPUT
IMAGE REJECTION
I-F REJECTION
NOISE BLANKER
S- METER
DYNAMIC RANGE
3 rd ORDER ICP
SQUELCH
SENSITIVITY
PASS BAND TUNING
AUDIO OUTPUT
NOTCH FILTER
AUDIO BANDPASS
FILTER
TONE CONTROL
USB, LSB, CW, FSK/AFSK, AM, (FM optional).
1.6 - 29.999
am | з5ру| 10 pv |00 SN @ во кн |
|_ үн | лору | зору |12 ф snan @ 15 кы
6.00 kHz
| oPrioNAL | 180 kHz | 290 khz]
| OPTIONAL | 50 kHz | — 140 khz]
| OPTIONAL | 25 kHz | кш
ін) |5ш |9.
Approx. -20 dB tor 1.6 to 29.999 MHz, -10 dB for .1 to 1.6 MHz.
1st = 75 MHz, 2nd = 9.0 MHz, 3rd = 6.3 MHz (FM 3rd = 455 kHz).
Switchable 500 phono jack.
» B0 dB.
»70 dB.
Switchable on/off with adjustable width.
Automatically
switched
on
during
receive.
Calibrated
to
50
рУ
at
59.
100
dB typical.
+18 dBm
АМ,
CW,
SSB,
FSK
(1.6
-
29.999
MHz)
=
Less
than
1
uV.
Optional
FM
(1.6
-
29.999 MHz) = Less than .4 uV.
+ 1.2 kHz.
1.5 watts @ 80 with less than 2% distortion.
250 to 2.2 kHz, 50 dB notch typical.
4 pole, variable center frequency 220 to 1.7 kHz, 35% bandwidth @ -6 dB.
Variable fader control selects filtered or flat audio response.
Variable 15 dB rolloff @ 5 kHz.

СНАРТЕК 1
INSTALLATION
1-1 INTRODUCTION When setting up
the station, provide adequate ventilation for
the heat sinks on the transceiver and the power
supply. Do not confine the transceiver and
power supply to a small volume without
forced ventilation to circulate cool air around
the heatsinks. Also try to select a location that
allows comfortable access to the front panel
controls and adequate clearance for rear panel
connections.
When operating RTTY, SSTV, FM, or
other high-duty modes, it is recommended that
a small fan be directed on the heat sink. The
sink temperature may reach as high as 200"
Fahrenheit, which is still within the rating for
the transistors, but certainly hot enough to
cause a serious burn if touched.
1-2 FIXED STATION & MOBILE The
PARAGON, with conventional antennas, will
perform with distinction in any ham shack.
The PARAGON may be used for mobile
operation in a car, boat, plane, or other vehicle.
It operates directly from a 13.8 volt supply
source and is self-contained except for key,
microphone, and antenna. ІҒ desired, the
Model 1140 Circuit Breaker may be installed
in series with the +13.8 volt supply line. The
circuit breaker will function as both an exter-
nal on/off switch and an over-current protec-
tion device for the PARAGON.
NOTE: Ifthe battery voltage drops below
12 volts, the PARAGON will not operate prop-
erly.
The SWR meter is especially useful in
setting mobile whip antenna lengths to the
operating frequency.
WHEN USING AN ALTERNATOR
voltage transients, caused by momentarily
open regulator contacts, may cause serious
damage to the transceiver circuits.
1-3 POWER SUPPLY Usea12t014 VDC
negative ground power source capable of de-
livering 22 amperes, well regulated. When
powering from the Model 960 power supply,
interconnect units with the cable attached to
the power supply.
When other supplies or a battery are
used, pin connections to the power socket are
as shown in FIGURE 1-1.
FIGURE 1-1. POWER SUPPLY
CONNECTIONS
The front panel POWER switch controls
a relay inside the transceiver that switches the
high current 13.8 VDC to all circuits except
the logic circuits. When using a TEN-TEC

power
supply,
a
wire
between
pins
2
and
3
enables
the
primary
AC
circuit
in
the
power
supply
when
using
the
supplied
cable.
The
PAR
is
turn
The
power
supply
should
be
left
on
at
all
times
and
the
trans-
ссіуег
turned
OFF
and
ON
via
the
POWER
switch
in
order
to
retain
memories.
If
making
your
own
power
cable,
use
number
12
or
14
gauge
wire
for
the
plus
and
minus
(GND)
leads,
with
the
cable
length
as
short
as
possible
for
minimum
cable
loss.
The
PARAGON
contains
an
internal
fuse,
located
in
the
Lowpass
Filter
area,
under
the
top
shield.
If
this
fuse
needs
replacing,
be
sure
to
use
a
25
Amp.
Fast
Blow.
If
additional
protection
is
desired,
a
Model
1140
Circuit
Breaker
may
be
installed
in
series
with
the
13.8
VDC
supply
line.
1-4
ANTENNAS
Апу
antenna
presenting
50
to
75
Q
impedance
will
load
satisfactorily.
Random
length
and
balanced
antennas
will
require
an
antenna
tuner.
Most
popular
mobile
antennas
will
operate
at
their
resonant
fre-
quency
without
special
matching.
When
they
are
used
as
portable
antennas,
a
good
ground
system
or
Counterpoise
should
be
provided.
The
PARAGON
is
designed
for
use
with
an
unbalanced
feed
system.
Although
improper
antennas
will
not
damage
the
final
output
transistors,
it
is
sug-
gestedthat
an
SWR
of2
to
1
orless
be
achieved
for
maximum
performance.
In
cases
where
the
antenna
cannot
be
matched
to
a
better
SWR,
the
PARAGON
can
be
operated
at
re-
duced
input
power
by
adjusting
the
RF
PWR
control.
Be
sure
to
readjust
the
MIC
control
after
reducing
the
RF
PWR
level.
1-5
MICROPHONE
For
SSB
operation,
plug
a
low
impedance
dynamic,
or
electret
microphone
into
this
jack.
Amplified
micro-
phones
can
be
used
if
the
output
level
is
ad-
justed
to
а
low
enough
value
to
prevent
the
microphone
circuit
from
overloading.
High
impedance
mics
(above
25КО)
will
not
work.
1-6
KEY
For
СУУ
operation,
connect
a
straight
key,
bug,
or
electronic
keyer
to
this
jack.
When
using
electronic
keyers,
they
should
be
configured
for
positive
keying,
not
"grid
block"
or
negative.
If
configured
for
negative
keying,
no
damage
will
occur,
but
the
keying
circuit
will
not
operate.
1-7
GROUND
In
the
interest
of
personal
safety
and
to
reduce
the
possibility
of
stray
RF
pickup
on
interconnecting
cables
which
may
cause
parasitic
oscillations,
all
station
equip-
ment
should
be
well
grounded
to
earth.
It
is
also
important
to
strap
all
equipment
chassis
together
with
short,
heavy
leads.
The
strap
between
the
power
supply
and
the
transceiver
also
serves
to
reduce
the
voltage
drop
on
the
negative
lead
caused
by
wire
and
connector
resistance.
In
mobile
installations,
connect
a
ground
strap
between
the
rear
panel
ground
lug
and
the
automobile
chassis.
1-8
BATTERY
BACKUP
As
long
as
the
PARAGON
is
connected
to
a
source
of
13.8
VDC,
the
microprocessor
and
memory
RAM
circuits
will
retain
all
memories,
last
fre-
quency
used,
and
date
&
clock
information.
The
front
panel
POWER
switch
does
not
re-
move
power
to
the
logic
circuits.
To
prevent
loss
of
memory
during
power
failures
or
while
transporting
the
PARAGON,
a
backup
battery
(9
volt
alkaline
or
Ni-Cad)
can
be
installed
in
the
PARAGON.
Refer
to
PARAGRAPH
5-1.1
for
infor-
mation
on
removing
the
top
cover.
Located
in
the
center
of
the
chassis
is
the
battery
holder.
A
battery
clip
is
included
in
the
packing
kit
shipped
with
the
PARAGON.
With
the
POWER switch in the ON position, and the
PARAGON operating, install the battery in the
holder
and
plug
the
battery
cable
into
the
49V
connector
located
on
the
left
rear
corner
of
the

large Logic Board. То verify correct installa-
tion, turn off the POWER switch and remove
the power supply cable. After waiting a min-
ute or two, reconnect the power supply and
turn the POWER switch back on. The PARA-
GON should power up on the same frequency
that it was on when you removed power and
the clock should not have lost any time. If eve-
rything is correct, replace the top cover.
An alkaline battery will provide approxi-
mately 150 hours of backup if power is re-
moved, otherwise the battery will last for it's
shelf life. If the transceiveris not to be used for
long periods of time, it is recommended that
the battery be removed to prevent possible cor-
ro sion. When using a 9 volt Ni-Cad battery,
the power supply should be turned on at least
three to four hours per week to keep the battery
trickle charged.
1-3/1-4 blank

CHAPTER 2
CONDENSED OPERATING INSTRUCTIONS
2-1 INTRODUCTION Тһе following in-
structions will enable the operator to quickly
place the PARAGON into operation. Refer to
CHAPTER 3 of this manual for more detailed
descriptions of the controls and unique func-
tions of the PARAGON,
Refer to CHAPTER 1 for information on
connecting power supply, microphone, an-
tenna, and other accessories.
2-2 SELECTING FREQUENCY There
are two ways to select frequency, via the
keypad and using the main tuning knob. With
the keypad, the MHz portion of the frequency
is entered first followed by the decimal point.
If the frequency is less than 1 MHz, the deci-
mal point is entered first.
After the decimal point, the remaining
kHz portion of the frequency is entered and the
transceiver will change to the new frequency
by pressing the key. Zeros at the
end of the frequency, if no more numerals are
to follow, do not need to be entered. For whole
MHz frequencies, you can simply enter the
first one or two digits and then press
(ENTER |. The following are examples of
different frequencies and how to enter them. If
an error is made during the entry procedure,
press the key, and repeat the
entry.
Examples:
14.275 MHz:
wH CZJEZ3 CS ENTER |
21.0 MHz:
[2 ][ 1 ][ ENTER ]
950 kHz:
[IS ILS 1L ENTER |
2-3 INITIAL FRONT PANEL SETTINGS
Set the front panel controls as follows:
KEYPAD:
Select Mode, press CW,USB or LSB.
Select VFO A, press A/B until
annunciator in display
indicates “VFO А".
Select 2.4 kHz Bandwidth, press[ 2.4] .
AF ------------- Adjust to suitable audio level
TONE --------- Midway
FADE --------- Max counter-clockwise
BP ------------- Max counter-clockwise
PBT ------------ Midway
NOTCH ------- Max counter-clockwise
MIC ------- Max counter-clockwise
RF PWR ------ Max counter-clockwise
RF ------------- Max clockwise
SQL --------- -- Max counter-clockwise
METER ------- FWD
NB —----------- OFF
VOX/PTT ----PTT
QSK ----------- FAST
AGC ----------- ОМ & SLOW
ATIN --------- OFF
PROC --------- OFF

2-4 TRANSMIT
CW ---Press TUNE key on keypad and
adjust RF PWR control for desired output
power às observed on meter. Press TUNE key
again to return to transceive mode.
SSB --- Adjust RF PWR control as de-
scribed above, then, using PTT, adjust MIC
control until ALC LED just lights on voice
peaks.

СНАРТЕК 3
DETAILED
OPERATING
INSTRUCTIONS
3-1 KEYPAD FUNCTIONS The keypad
is used to enter frequency, to select VFO's,
Mode, Bandwidth, alphanumeric tag, and to
access microprocessor controlled functions.
When a key is pressed, a “beep” will be heard
from the speaker, indicating key closure. The
beep level can be adjusted with the rear panel
BEEP/VOICE control.
Some of the keys have two functions
with the top functions accessed via the SHIFT
key. After completing a multi-key function a
double beep will be heard.
3-L1 SELECTING MODE
(| ам ][ FM )
Mode selection on the PARAGON is accom-
plished by pressing the desired mode key on
the keypad. The corresponding LED will light
indicating the chosen mode. When selecting
AM, LSB, or USB modes, a typical crystal
filter selection of either 6.0 or 2.4 kHz will
automatically be chosen. This can be changed
by pressing a different Filter key. See PARA-
GRAPH 4-1.3 for RTTY operation.
3-12 CRYSTAL FILTER SELECTION
tara eame
These keys select the desired IF bandwidth. In
the standard configuration, the 6.0 and 2.4 kHz
filters are installed. Optional filters may be
installed for 1.8, .5, and .25 kHz. LEDs above
the keys indicate the selected bandwidth.
Bandwidth selection is independant of
the mode selected except in the optional FM
mode. The IF bandwidth is automatically 15
kHz when this mode is selected.
3-1.3 TUNE
[ TUNE ]
This key is used to place the transceiver in the
transmit mode, or “key down". Itis used when
adjusting power output, and for system checks
and SWR measurements. Pressing this kev a
T | > и
ceive mode. NOTE: If TUNE is pressed when
the transmit frequency is outside the ham
bands, nothing will happen.
3-1.4 RECEIVE & TRANSMIT OFFSET
This function allows independent control of
the receive and/or transmit frequencies with a
range of + 99.9 kHz. LEDs above the keys
indicate the selected function, the OFF. an-
nunciator lights, and the fluorescent display
shows the frequency deviation + in kHz.
In the RX OFFset mode, received sta-
tions may be "zeroed in" without affecting the
transmit frequency. TX OFFset may be used,
for example, to answer a station calling CQ
and "listening 2 kHz up".
Only one OFFset function can be used at
atime. Pressing the key a second time disables
the selected offset function.

3-L5 DISPLAY
This
key
selects
the
time,
date,or
tag
shown
on
the
fluorescent
display.
Each
time
the
key
is
pressed
the
display
will
toggle
from
DATE
to
TIME
to
TAG
and
the
annunciators
above
the
display
will
show
the
selection.
3-1.6 VOICE
This
key
is
used
to
activate
the
optional
Model
257
Voice
Readout.
3-1.7 SPOT
[-sPoT )
This
function,
which
is
designed
primarily
for
use
in
CW
mode,
allows
the
operator
to
listen
to
the
frequency
that
he
is
transmitting
on.
Using
this
function,
the
transmitter
frequency
can
be
tuned
to
the
incoming
received
signal
by
zero-beating
with
that
signal.
This
is
a
mo-
mentary
function
and
the
transceiver
will
re-
turn
to
the
previous
receive
frequency
when
the
key
is
released.
For
best
results,
select
a
wide
bandwidth
filter
when
using
this
func-
tion.
3-1.8 VFO SELECTION
These
keys
control
the
operation
of
the
two
VFOs.
The
A/B
key
toggles
between
VFO
A
&
VFO
B
with
the
annunciators
above
the
display
indicating
the
selected
VFO.
When
the
A-B
key
is
pressed,
the
frequency
of
the
selected
(and
displayed)
VFO
is
placed
in
the
other
undisplayed
VFO.
The
SPLIT
key
allows
the
receive
and
transmit
frequencies
to
be
assigned
to
each
VFO.
Anannunciator
above
the
display
indi-
cates
that
this
function
is
enabled.
To
receive
on
VFO
A
and
transmit
on
VFO
B,
sclect
VFO
B
with
the
A
/
B
key
and
select
the
desired
transmit
frequency,
then
select
VFO
A
and
select
the
desired
receive
frequency.
Then
press
the
Г
SPUT
|
кеу.
To
transmit
on
VFO
A
and
receive
on
VFO
B,
select
VFO
A
and
select
the
transmit
frequency.
Select
VFO
B
and
select
the
re-
ceive
frequency,
then
press
the
key.
Pressing
the
SPLIT
key
a
second
time
disables
this
function.
NOTE:
When
tuning
with
the
SPLTT
mode
on,
only
the
displayed
VFO
is
changed!
3-19 TUNING RATES
ӨС rasr |
Тһе
FAST
key,with
LED
indicator,
selects
the
tuning
rate
and
resolution
of
the
main
tuning
knob
according
to
the
following
table.
CW/USB/LSB/FSK
A
TABLE
3-1.
TUNING
RATES
In
addition,
the
tuning
knob
has
a
speed
shift
feature
which
increases
the
tuning
rate
automatically
when
the
knob
is
spun
at
а
fast
rate.
3-1.10 TEN Hz DISPLAY
12 Hz
(SHIFT) [MT]
To
display
the
10
Hz
digit
of
the
frequency,
press
the
SHIFT
key
followed
by
the
MT
key.
Pressing
theSHIFT
and
MT
keys
again
will
extinguish
the
10
Hz
digit.

3-111 TUNING KNOB ОСК
This key and its associated LED is used to lock
out the main tuning knob to prevent accidental
frequency change. All keyboard functions re-
main active.
3-1.12 DOWN / UP
mo
Car Cy fa)
These keys are used to quickly move up or
down in either 100 kHz or 1 MHz steps. When
the FAST tuning function is Off, the step size
is 100 kHz. When the FAST tuning is On, the
step size is 1 MHz.
When used with the SHIFT key, these
keys are used to move up or down to the next
amateur band. When the HBD or HBU key is
held in there will be a short pause after which
the ham bands will rapidly increment or decre-
ment until the key is released.
3-2 MEMORIES
The PARAGON has 62 memory channels (00
to 61) which may be used to store favorite or
often used frequencies. Each memory stores
frequency, VFO in use, mode, filter selected,
and the alphanumeric tag. Memory 00 also
supplies the default tag (for example, your
call) whenever the TAG is displayed but no
memory has been selected.
Whenever a memory function is se-
lected, the MEM annunciator will light.
3-2.1 MEMORY STORE
Example: OIC)
To store information in a memory channel,
first make sure that the frequency, mode,
VFO, and filter selection are correct. Then
press the STO key and the desired 2 digit
memory channel number. The fluorescent
display will show the memory channel se-
lected. The STO function will NOT save the
diplayed tag but instead will fill the TAG with
blanks. To change the TAG see following in-
structions for TAG.
(CENTER)
A quick way of storing a memory with-
out having to specify a channel number is to
use the STO/ENTER method. The transceiver
will automatically choose the next available
memory channel. To use this function, press
the STO key and then the ENTER key. The
display will show the memory number used or
if all the memory channels are full, the display
will show “FULL”,
3-2.2 MEMORY RECALL
(Ret)
To recall а memory channel,press the RCL
key and then the desired 2 digit memory chan-
nel number. The display will show the re-
called memory. If the tuning knob is adjusted
or a frequency entered via the keypad, the
transceiver will return to the non-memory
mode.
To recall the last memory channel stored
using STO/ENTER, press the RCL key and
then the ENTER key.
3-2.3 TAG
Example: KAFW
(until TAG is displayed)
ша жата
The alphanumeric tag can store up to 7 charac-
ters of letters and/or numerals. To enter a tag
into the display, select the TAG display using

the
DISPlay
key.
Then
press
ENTER
and
the
display
will
prompt
you
with
underscores
for
each
character
position
(___
|
).
Enter
Ше
numbers
or
letters
located
beneath
the
other
keys
on
the
keypad.
If
7
characters
are
entered,
the
keypad
returns
to
normal
upon
completion
of
the
last
digit.
If
less
than
7
characters
are
entered,
press
theENTER
key
to
complete
the
process.
If
a
memory
has
been
recalled
and
the
MEM
indicator
is
on,
the
tag
just
entered
will
be
stored
automatically
in
the
displayed
memory
channel.
If
the
MEM
indicator
is
initially
off,
it
will
be
turned
on
and
you
will
be
prompted
to
enter
the
memory
channel
that
the
new
tag
should
be
stored
in.
If
you
enter
a
memory
channel
that
is
empty,
the
current
Frequency,
Mode,
VFO
and
Filter
informa-
tion
will
also
be
automatically
stored
in
that
memory
along
with
the
tag.
To
exit
the
TAG
entry
mode
at
any
time
press
the
CLEAR
key.
If
the
tuning
knob
is
adjusted,
this
part
of
the
display
automatically
returns
to
the
De-
fault
TAG
(filled
with
blanks)
or
the
tag
which
has
been
stored
in
memory
channel
00.
Using
this
technique,
you
can
set
the
Default
TAG
to
be
anything
you
want
(your
call
sign,
name,
etc.).
3-24
MEMORY
TUNE
[MT]
When
this
function
is
used,
the
main
tuning
knob
will
no
longer
tune
the
VFO
but
will
tune
through
all
of
the
programmed
memories,
including
those
that
are
locked
out.
The
dis-
play
will
show
a
“T”
to
the
right
of
the
channel
number
indicating
Memory
Tune
mode.
A
locked
location
will
display
an
"L"
(Locked)
in
front
of
the
memory
number.
Thus
the
Memory
Tune
function
also
provides
a
means
of
determining
which
memory
loca-
tions
are
locked
out
when
using
memory
scan.
3-2.5
SCRATCH
PAD
MEMORY
The
scratch
pad
memory
can
be
used
to
tempo-
rarily
store
and
recall
a
single
frequency
with-
out
affecting
the
main
memory
locations.
All
of
the
information
thatis
stored
using
the
STO
method
is
also
stored
in
the
Scratch
Pad
Memory.
With
the
desired
information
se-
lected,
press
the
STO
key
twice.
The
display
will
show
“SP”
indicating
that
the
displayed
frequency
is
in
scratch
pad
memory,
The
scratch
pad
memory
may
be
recalled
at
any
time
by
pressing
the
RCL
key
twice.
Each
time
anew
frequency
is
entered
into
the
scratch
pad
memory,
the
previous
memo-
rized
frequency
is
erased.
3-2.6 MEMORY SCAN
To
use
the
memory
scan
mode
press
the
MS
key.
The
microprocessor
will
then
scan
through
all
of
the
programmed
memories
(except
those
that
are
locked
out)
stopping
at
each
location
for
a
period
of
time.
The
scan
rate
will
be
determined
by
the
value
selected
using
the
RATE
function
(explained
in
PARAGRAPH
3-27).
To
temporarily
stop
the
scan
function,
press
and
HOLD
the
key
until
scanning
stops,
then
to
resume
scan
press
CT]
or
ГА)
.
The
receiver
will
then
resume
scanning
in
the
direction
chosen
by
the
keys.
To
exit
the
scan
mode
press
the
CLEAR
key.
NOTE:
In
order
to
use
Memory
Scan,
there
must
be
more
than
1
memory
channel
programmed
and/or
unlocked.
If
memory
scan
is
attempted
under
these
conditions
the
transceiver
will
appear
to
be
malfunctioning
as
the
keypad
and
main
tuning
knob
will
not
respond.
Pressing
the
CLEAR
key
will
return
the
transceiver
to
normal.

3-27 КАТЕ
ВАТЕ
( SHIFT] [MS]
The scan RATE is used in the memory scan
mode and determines the speed or RATE at
which the memory locations are scanned. To
program the scan rate press the SHIFT and
then the RATE keys. The word RATE and a
number from 0 to 9 will appear in the display
indicating the scan rate with 9 being the fast-
est. Press the UP/DOWN keys to select the
desired rate and then press the ENTER key.
3-28 MEMORY LOCKOUT
[ME]
The Memory Lockout function causes se-
lected memory locations to be bypassed dur-
ing Memory Scan. The information in the
locked out channel is retained and may be
unlocked at any time. To lock out a location,
recall the location to be locked out using either
the RCL or the MT functions, and press the
ML key. If the location to be locked out is
already in the display, the recall procedure
may be omitted. Then the location may be
locked out by just pressing the ML key. If the
locked out location is recalled or tuned via
Memory Tune, the display will show "L" to the
left of the memory channel number indicating
that the location is locked out.
3-2.5 MEMORY LOCK CLEAR
(міс)
The Memory Lock Clear key is used to unlock
a selected memory location. This memory can
be selected by using either the MEMORY
RECALL function or by using the MEMORY
TUNE function.
3.2.10 GLOBAL LOCKOUT
GL
C SHIFT ][sro]
TheGlobal Lockout key is used to lock out all
of the memory locations. This is useful if you
have a lot of programmed memories but only
wish to listen tọ a few select memories by
using the Memory Lock Clear key described
above.
3-2.11 GLOBAL LOCK CLEAR
ос
( ШЕТ (вс
The Global Lock Clear key is used to unlock all
of the locked out memory locations.
3-2.12 MEMORY CLEAR
z
This key will clear the currently displayed
memory channel, returning it to an unpro-
grammed state. To select the desired memory
you must first use the MEMORY RECALL or
MEMORY TUNE functions. MEMORY
CLEAR will only clear a recalled memory
location. If you wish to clear all memories the
best way is to press the RESET switch on the
right side of the transceiver.
3-3 CLOCK-CALENDAR & SYSTEM
FUNCTIONS ThePARAGON has a built-in
24 hour, crystal controlled clock and calendar
circuit. As long as power is supplied by the
power supply or the internal 9 volt back-up
battery (if installed), the clock will keep accu-
rate time. The procedures for setting the clock
and date functions are descibed below.
3-3.1 SET
Сент]
The SET key is used to set the 24 hour clock
and date.
3.32 CLOCK SET
(until TIME is displayed)
SET
(SHIFT) (міс)
3-5

To
set
the
time
in
the
24
hour
clock,
first
press
the
DISP
key
until
TIME
is
displayed.
Next
press
the
SHIFT
key,
then
the
SET
key
and
you
will
be
prompted
by
four
underscores
for
the
time
entry.
Enter
the
hours
and
minutes
digits
as
desired.
If
youenter
less
than
four
digits
you
must
press
the
ENTER
key
again
to
exit
the
SET
routine.
When
you
exit
via the
ENTER
key,
all
unfilled
digits
will
be
cleared
to
zero.
The
clock
will
begin
running
again
upon
pressing
the
ENTER
key
or
entering
the
last
of
the
four
digits.
3-3.3 DATE SET
(until DATE is displayed)
ма
To
set
the
date,
first
press
the
DISP
key
until
DATE
isdisplayed.
Then
press
the
SHIFT
key
followed
by
the
SET
key
and
the
day
of
the
month
will
be
blanked,
leaving
only
the
month.
Use
the
UP
or
DOWN
arrow
keys
to
select
the
correct
month,
then
press
ENTER.
Now
only
the
day
of
the
month
will
be
dis-
played.
Again
use
the
UP
or
DOWN
arrow
keys
to
select
the
correct
day.
When
you
are
finished
press
the
ENTER
key.
Me ТАН
FREQUENCY
10 Hz DIGIT
(OA)
отот]
+000
PARAGON
OFFSET TAG
С
Јов]
Смс
СМЕС)
421580
257
CHANNEL MEMORY
NUMBER
WES
ГГ
RE]
Чо
1580
125
LOCKED CHANNEL
3-34
SYSTEM
VERSION
NUMBER
The
instructions
for
the
PARAGON
micro-
processor
are
contained
in
an
EPROM.
Be-
cause
of
this
design,
updates,
improvements
and
new
features
may
readily
be
implemented
by
simply
changing
the
software.
By
pressing
the
SHIFT
key
and
then
holding
down
the
ENTER
key,
the
TAG
display
will
show
the
version
number
for
the
software
in
your
sys-
tem.
(EXAMPLE:
VER
3-2)
3-3.5
SYSTEM
RESET
SWITCH
The
RESET
switch
is
accessible
through
a
hole
located
on
the
right
side
of
the
PARAGON.
This
switch
is
connected
to
the
microproces-
sor
and
will
cause
a
system
reset
when
pressed.
If
the
PARAGON
ever
malfunctions
and
the
keypad
and/or
tuning
knob
no
longer
operate
properly,
pressing
the
RESET
switch
will
usually correct the problem. NOTE; Pressing
the
RESET
switch
will
clear
ALL
MEMO-
RIES
and
will
also
clear
the
clock
and
date
infor
mation
p
230
ТІМЕ
ТОМЕ
UM
DATE
FIGURE 3-1. FRONT PANEL DISPLAY

34 FRONT PANEL FUNCTIONS Тһе
following sections describe the front panel
displays and the controls which are not located
on the keypad. Refer to FIGURE 3-3 to help
locate each control,
3-4.1 DISPLAY AREA As shown in FIG-
URE 3-1, the vacuum fluorescent display
shows the frequency, Rx/Tx Offset, memory
status, the date, time, or tag, and other micro-
processor controlled functions. The eight an-
nunciators above show the VFO selection,
OFFset or MEMory selection, and the DATE,
TIME, or TAG selection.
3-4.2 AF GAIN/TONE The AFGAIN con-
trol varies the audio output of the transceiver.
The TONE control is a low pass type with a
rolloff of approximately 15 dB at 5 kHz.
3-43 METER Є SWITCH In receive
mode the meter will automatically read 5 units
when the meter switch is in any position. The
S meter will be accurate only when the RE
control is fully clockwise. The meter is factory
calibrated for a reading of S9 at 50 ЦУ when
operating at 15 MHz.
When transmitting, the meter indicates
the following:
IC position measures the current drawn
by the final amplifier module. Use the scale
marked 0 to 20 amperes.
SWR position provides a reading of
power reflected from the antenna, When the
forward power is 100 watts, the standing wave
ratio can be read from the scale marked SWR.
FWD position measures forward power
tothe antenna. Use the FWD scale marked 0
to 100 watts.
To determine SWR, place meter switch
in FWD position, press TUNE and adjust RF
PWR control fora reading of 100 watts. Then
switch the meter switch to REF and use the
scale marked SWR. Press the TUNE key
again to return to transceive mode.
PROCESS position displays the level
of compression applied to the MIC input when
the PROCess control is turned on.
3-44 NOISE BLANKER Те М.В. switch
turns on the blanker circuit. The WIDTH con-
trol varies the blanking pulse width.
3-455 ATTENUATOR Toreduce suscepta-
bility to receiver overload in the presence of
extremely strong signals, the ATTN switch
removes the front end RF amplifier from the
receiver circuitry. The effectis a 20 dB reduc-
tion in signal level to the first mixer but with
more dynamic range and greater sensitivity
than would be the case with a simple attenu-
ator. The LED below the switch indicates that
the attenuator has been selected.
3-4.6 BPF/FADE This control fades from
normally flat audio response to a bandpass
filter variable from 220 to 1700 Hz with the
BPF control. Various amounts of bandpass
effect can be chosen by the degree of clock-
wise rotation. The filter width is 3596 of the
selected center frequency at the -6 dB points.
3-4.7 PBT / NOTCH The PBT control ad-
justs the position of the PBT IF crystal filter in
relation to the fixed second IF filter. When the
selected filter is wide, i.e. 2.4 or 1.8 kHz, the
PBT control essentially becomes a variable
bandwidth control. Counter-clockwise rota-
tion shifts the passband towards the low side
of the signal when in USB mode, clockwise ro-
tation shifts the passband toward the high side
of the signal. When in LSB mode, the above
directions are reversed.
The PBT circuit in the PARAGON pro-
duces the effect of varying the frequency re-
sponse of signals passing through the narrow
filter, which enables you to separate signals
which are close together. On RTTY it can
place the narrow filter to pass only the 2295
and 2125 Hz tones for superior rejection of

adjacent
signals.
The
PBT
has
no
effect
on
the
transmitter
frequency
or
bandwidth.
The
NOTCH
control
adjusts
the
center
frequency
of
the
audio
notch
across
the
pass-
band.
The
notch
depth
is
at
least
40
dB
and
will
reduce
carrier
interference
by
this
amount
or
more.
To
use
the
NOTCH,
rotate
the
control
slowly
until
the
unwanted
signal
is
reduced.
The
notch
circuit
is
effectively
removed
by
turning
the
control
fully
counter-clockwise.
3-4.8
MIC/RFPWR
The
RFPWR
control
varies
the
amount
of
power
output
for
all
modes.
This
allows
you
to
set
your
output
power
to
any
value
from
25
to
100
Watts.
The
MIC
control
varies
the
amount
of
audio
ap-
plied
to
the
transmit
balanced
modulator.
To
set
these
controls,
place
the
METER
switch
in
the
FWD
power
position
and
place
the
transceiver
in
transmit
using
the
TUNE
function.
Advance
the
RF
PWR
control
to
the
desired
power
level.
The
CW
level
is
now
set.
For
SSB
operation,
continue
by
placing
the
transceiver
in
either
the
USB
or
LSB
mode
and
while
speaking
into
the
microphone
in
a
nor-
mal
voice,
advance
the
MIC
control
until
the
ALC
LED
lights
on
voice
peaks.
NOTE:
The
ALC
LED
will
light
at
all
RF
PWR
settings
when
operating
in
CW
or
TUNE
modes.
Increasing the MIC setting over that
required to just light the ALC LED will not
result
in
any
appreciable
increase
in
power
out.
However,
overdrive
will
produce
SSB,
AFSK, or SSTV distortion products.
The PARAGON uses a “current-limit”
protection system where the drive level is
automatically
reduced
to
prevent
the
final
transistors from drawing more than 20 am-
peres.
If
full
power
output
сап
not
be
obtained,
it
is
an
indication
that
the
antenna
is
not
pre-
senting a 50 Q impedance. Refer to PARA-
GRAPH 4-1.4 for more information.
3-4.9
PROC
The
PROCess
switch
and
control
activates
the
speech
processor
and
de-
termines
the
processing
level.
The
processor
increases
the
average
speech
power
and
al-
lows
a
greater
range
of
voice
levels
to
attain
peak
ALC
level.
An
LED
below
the
switch
indicates
when
the
processor
has
been
se-
lected.
The processing level will affect the MIC
control
to
some
extent.
To
set
the
processor,
turn
it
off
and
adjust
the
RF
PWR
and
MIC
as
described above. Turn the PROCess switch on
and
advance
the
control
until
the
meter
needle
moves
into
the
center
of
the
black
band
(on
the
PROC
scale)
on
voice
peaks.
More
processing
is
available
by
further
clockwise
rotation
of
the
control,
but
the
MIC
control
must
be
re-
duced
to
keep
the
ALC
action
constant.
Severe distortion, objectionable back-
ground noise, and transmitted splatter will
occur
if
the
MIC
control
is
not
adjusted
so
that
the
ALC
LED
just
lights
on
voice
peaks.
The
processed audio may be monitored to prevent
this
distortion
by
using
the
MONITOR
control
on
the
rear
pancl.
The
use
of
headphones
is
recommended to prevent feedback from the
speaker. See PARAGRAPH 3-5.7.
3-4.10 RF/SQL The RF gain control varies
the gain ofthe I-F stages. The АССіз depend-
ent on the setting of this control and therefore
the S meteris calibrated only when the RF gain
control is fully clockwise.
The
SQL
control
sets
the
squelch
thresh-
old
level.
The
squelch
level
is
determined
by
Ше
AGC
circuits.
To
adjust
the
squelch,
rotate
the
control
clockwise
until
the
received
audio
becomes
quiet.
To
turn
the
squelch
function
off,
rotate
the
control
fully
counter-clockwise.
3-4.11
AGC
FAST
/
SLOW
&
ON/
OFF
These
switches
control
the
automatic
gain
control
(AGC)
system.
In
the
FAST
position,
the
recovery
time
of
the
AGC
system
is
ap-
proximately
.2
seconds
and
in
the
SLOW
position
approximately
2
seconds.
The ON/OFF switch defeats the AGC