TriStar 797 User manual

Operation Manual
Tristar 797
200 Channel Mobile
5-Mode Transceiver

General Description
The TRISTAR 797 is acombination transmitter-receiver designed primarily for
mobile use. It employs the very latest technology to provide 200 channels of
operation by means of digital frequency synthesis with PLL (phase-locked-loop)
circuitry. The use of PLL assures a precise on-frequency operation on every channel
in both transmit and receive mode. The TRISTAR 797 also includes many other
features which will provide greater operating convenience and assure optimum
communications under a wide range of conditions.
Operable on 200 channels divided into five groups of 40 channels.
3-way RF Gain switch.
Full noise reduction features -ANL and noise blanker.
5 modes of operation - CW, LSB, USB, AM, or FM - selectable with arotary
switch.
Provision of PA.
Concentrically mounted Fine and Coarse controls to fine tune to any transmis-
sions or operate in inter-channel frequencies.
Tone switch to select receive tonal quality in 2-way.
RF power output switchable in 3-way for required communication range.
TX lamp that indicates you are on-the-air.
External speaker jack for an extra sound source.
Electrically floating chassis for negative or positive ground operation without
switching,
Ahigh-sensitivity dynamic microphone equipped.
CAUTION
FOR REPLACEMENT OF THE FUSE
IN DC POWER CABLE, PLEASE BE SURE
TO USE 3,5A FUSE.
2

Channels.
Frequency space.
Emission.
Power source.
Receiver
Specifications
General
Frequency composition. PLL synthesizer
Frequency range. A - 26.065 to 26.505 MHz
B - 26.515 to 26.955 MHz
C- 26.965 to 27.405 MHz
D- 27.415 to 27.855 MHz
E- 27.865 to 28.305 MHz
200
10 kHz
AM/FM/USB/LSB/CW
13.8 V DC
Sensitivity.
Selectivity.
Audio Output.
Fine Tune range.
Coarse Tune range.
Squelch range.
I ntermed iate
frequency.
Transmitter
AM - 1 micro-V @ 10 dB SIN
FM - 1 micro-V @ 20 dB SIN
SSB/CW - 0.5 micro-V @ 20 dB SIN
60 dB
2W@80hm
± 800 Hz
±5 kHz
0.5 to 300 micro-V
AM/FM - 10.695 MHz/455 kHz
SSB/CW - 10.695 MHz
RF power output. High Mid Low
SSB/CW 12 W8W 2W
AM ~5W 4W 1W
FM lOW 7W 2W
SSB generation. Double-balanced modulator with crystal
latice filter
Coarse Tune range. ±5 kHz
3

r---------
Operating Controls and Features
(1) OffNolume Control
Varies the sound output from the speaker. Also incorporates an on-off switch at
the extremely counterclockwise position.
(2) Band Selector
Selects a group of 40 channels in five positions - A, B, C, 0, or E (200 in alll.
(3) Squelch Control
Used to eliminate any annoying background noise when no signals are present. The
degree of sensitivity to incoming signals is adjustable. When the Squelch control is
rotated to the fully clockwise position, it provides maximum squelch; in the fully
counterclockwise position, it provides minimum squelch.
(4) Mode Selector
Selects the mode of reception and transmission - CW (continuant wave), LSB
(lower side band), USB (upper side band), AM (amplitude modulation), or FM
(frequency modulation).
4

• (5) Fine/Coarse Control
T his is concentrically located contra I that perm its ind ividual adj ustment of receiv-
ing and/or transmitting frequencies.
rA!'/ Fine (inner knob). Provides fine tuning of the receiver section. On regular AM and
FM reception, this will permit adjustment to off-frequency transmissions. In the
SSB (either upper side band or lower side band) mode, this is used as a voice clarifi-
er to adjust for clearer voice reception. This control will not affect the transmitter
frequency.
( '/ l Coarse Tune (outer knob). This control operates in the same manner as the Fine
knob except it provides adjustment of both receive and transmit frequencies.
(6) Channel selector.
A 50·detent rotary switch to select any of 200 channels in conjunction with the
Band Selector switch.
Window above this switch indicates the channel selected using an LED (Light-
emitting-diode) digital readout.
(7) TX indicator
Lights up when transmitting.
(8) Channel indicator
A digital LED display to show channel selected.
Turned off when operating PA.
(9) Power Selector
Enables you to select the RF power output of the transceiver in 3 ways:
High. In this position the transceiver produces full rated RF power for maximum
communication range.
!'.t1iddle. In this position, the RF power is medium level.
low. In this position, the minimum RF power output is obtained, may be used for
short range communication.
Note. The RF power output level (W) which each position provides is dependent on
the mode of operation. See Specifications section for specific RF power output.
(10) Tone Switch
Changes tonal quality in receiving in 2 ways:
High. High tones in the sound output are emphasized.
Low. Low tones in the sound output are emphasized.
(11) CB·PA switch
When set to PA (lever down) position, the transceiver acts as a public address
amplifier. Before operating PA, you must first connect an external PA speaker
(8 Ohm, more than 2 W) to the PA Speaker jack on the unit rear panel.
(12) NB switch
Activates the noise blanker circuit which is effective in reduction of impulse type
noises (ignition noise, etc.).
5

(13) AN L switch
Activates the automatic noise limiter in the audio. The ANL will be effective
in reduction of atmospheric (discharge) interference.
(14) RF Gain switch
Selects RF Gain (receiver sensitivity) of the transceiver in 3 ways:
OX. In this position, the receiver section provides maximum sensitivity so that it
can pick up even weak signals.
Normally this switch should be placed in this position.
Mid. In this position, the receiver sensitivity is medium, and may be used when you
desire to pick only strong or fairly strong signals.
Local. In this position, the receiver sensitivity is minimum, and the receiver will
pick up only the strong signals. May be used when receiving strong (close) signals
which are causing overload in receiving sound.
(15) Meter
Serves to dual purpose
When receiving, this meter gives the relative strength of incoming signals in'S'
units. When transmitting, this gives RF power output in lower scale.
(16) Microphone jack
Accepts plug from the microphone supplied. The jack has a locating key inside and
allows the plug inserted in only one way. Do not force the plug but align key way
properly onto the Jack.
(17) Microphone
Supplied. With transmit pushbar (PTT) mounted at the left side.
®®@
@ @
6

Rear Panel Connection
(1) Antenna
Accepts a PL-259 type coaxial connector from the antenna lead-in cable.
(2) CW Key jack
Accepts a 3.5 mm 2-conductor phone plug to connect a CW key.
(3) External Speaker jack
Used to connect an external speaker (8 Ohm 4 W) as an extra sound source. Inser-
tion of the plug from a speaker will silence the internal speaker automatically.
(4) PA Speaker jack
Used to connect a PA speaker (8 Ohm 4 W) for PA operation.
Before operating PA you must first connect a PA speaker to this jack.
(5) 13.8VDCjack
13.8 V DC power for the transceiver supplied through this socket (using DC power
cable supplied).
7

Fine Control Opeation
This control provides fine tuning of the receiver by ± 0.8 kHz. On regular AM or
FM reception, this will permit slight adjustment of your tuning in cases where the
received signal is slightly off-frequency. For SSB reception, this control is used as
a voice clarifier by turning it for clearest, most intelligible voice.
Coarse Tune Ca.ntrol Operation
This control acts like a VFO (variable frequency oscillator) allowing inter-channel
reception and transmission. This shifts the assigned center frequency of the channel
5 kHz up (when rotated clockwise fully) or down (when rotated counterclockwise
fully). In the center position, the receiving and transmitting frequency is normal
(as listed in the Frequency/Channel Chart).
CW Operation
(1) Set the Mode selector to CW position.
(2) Connect a CW key to the CW Key jack on the rear panel.
(3) To transmit with Morse codes, simply operate the key.
Note. To transmit CW, you may not depress the transmit switch (PTT) on the
microphone.
Morse Codes
A
B
C
o
E
F
G
H
I
J
K
L
M
N
o
P
Q
R
S
T
U
V
W
x
y
z
10
1·-)
1-' ·1
1- -,)
(-, )
( ·1
(. -)
(-_. )
()
I,)
I· ---)
(- -)
(- ,)
1--)
1- )
1---1
1 -- 1
1-- -I
1- 1
( ,)
(-)
I·· -)
I, .-'-)
I· --I
(- -)
1- --I
(-_. )
1
2
3
4
5
6
7
8
9
o
(. ----I
(. ---)
(. --I
( _)
()
(_. )
(-- .. I
1---· )
1----· )
(-----)

Frequency/Channel Chart
A·Band B·Band C-Band D-Band
E-Band
MHz MHz
MHz MHz MHz
Channel Frequency Channel Frequency Channel Frequency Channel Frequency Channel Frequency
1
26[)6~)
126S15 126.965 1
27~ 1 ft
I 27 865
226.075 226.525 226.975 2 27 AZ5 227.875
326.085 326.535 326.985 327A35 3
27.885
·••.27.905·
426.105 426.555 427.005 427A55 4
526115 526.565
~)
27.015 527A65 527.915
G26.125 626.57S 627.025 627A
75
6 27.925
7
26.m
726585 727.035 727.485 727.935
B 26.155
•B26.605 .827.055 r827.505 #8
27.955 '
926165 926615 927.065 927.515 9
27.965
10 26175
10
26.625 10 27.075
10 27.525
10
27.975
11 2G 185
11
26.635
11 27.085
11 27.535
11
27.985
••..
12
26.205 •
12 26655 12 27.105
12 27555
12
28.005
13
262E)
13 26.665
13 27.115
13 27565
13 28.015
14
26.225 14
26.675 14 27.125
14 27 575
14
28.025
15 26.235 15 26.685 15
27.135
15 27585
15
28.035
J26.705 •·.
28 055 •
16
26.255
16
16 27.155
16 27605
16
17
26.265
17 26.715 17 27.165
17
27.615 17 28.065
18
26.275
18 26.725
18 27.175
18 27625
18 28075
19 26.285 19 26.735 19
27.185 19
27.635 19 28085
·.•
..
•
20 26305 20
26.755 20
27.205 20 27655
20
28.105
21
26315
21 26.765 21
27215 21
27.665 21 28115
22 26325 22 26.775
22
27.225 22
27.675 22
,
28.125
23
26355?
23
26.805 \
23
27.255 ~
23
27.705 )
23 28.155
~.
24
26.335
24
26.785
24
27.235
24 27.685 24
28.135
25 26345
75 26.795
25
27.245 25 27.695
25 28.145
26 26.365 26
26.815
26 27265 26
27.715
26
28.165
27
26375
27 26.825 27 27.275
27 27.725 27
28.175
28 26385 28 26.835
28 27.285
28
27. 735 28
28.185
29
26395
29 26.845 29
27295 29 27.745
29 28.195
30 26405 30 26.855 30 27.305 30
27.755 30 28.205
31 26.415
31 26.865 31 27315
31 27.765
31 28.215
32 26425 32
26.875
32
27.325
32 27775 32 28.225
33 26.435 33
26885 33
27.335 33 27.785
33 28.235
34 26.445 34 26895 34 27.345
34
27.795
34 28.245
35 26.455 35 26.905 35
27355
35 27.805 35
28255
36 26.465 36
26915
36
27.365
36 27.815 36
28.265
37
2,6475
37 26.925 37
27375 37 27.825
37 28.275
38 2,6.485 38 26935
38
27.385 38
27.835 38 28.285
39
26.495
39 26.945 39
27.395 39
27.845 39 28295
40
2650"
40
26.955
40 27.405
40
27.855
40 28305
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