Table of Contents
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Model
TR-7850
-
d
.
V H F F M TRANSCEIVER
USE T H I S SERVICE M A N U A L
1
TOGETHER W I T H T H A T OF TR-7800.
7
3
\
CONTENTS
A
product of
TRIO-KEN WOOD CORPORATION
17.5,
2-chorne. Shlbuya, Shlbuya-ku. Tokyo 150. Japan
TRIO-KENWO#) COMMUNICATIONS, INC.
1 1 1
I
We%! Walnul
s11e.1
Common
Cal#lorn#a
90220 U
5
A
TRImKENW000 COMMUNICATIQNS, QmbH
0
6374 Sle
nbacn
TS Indurrnsscrarse BA
West Gsrmanv
TR,I,%TE?w~~n~Y,",TF2kIA~PTY~
LTD-
....................
................... ........
BLOCK DIAGRAM
. .
. .
2
PC BOARD VIEW
....
FINAL UNIT (X45-1 180-10)
...................
. . . . .
. .
2
...................
..................................
PARTS LIST
.
.
3
SEMICONDUCTOR DATA
............................................
4
ADJUSTMENTS
............................................................ 5
.......................................
SCHEMATIC ABBREVIATION
6
................................
SCHEMATIC DIAGRAM (K)(M)
7
SCHEMATIC DIAGRAM (W)(T)
.................
BACK COVER
SPECIFICATIONS
[General]
Sem~conductors
. . . . . . . . . . . . . . . . .
MPU
1
ICs
18 1W)(T). 19 (K)(M)
Transistors 5 8 (W)(TI. 6 0 (K)(M)
FETs
9
Diodes
7 9 (K)(M)(T). 78 (W)
Frequency range..
...................
144.000 to 145.995 MHz (W)(T)
144.000 to 148.995 MHz (K)(M)
Freauencv svnthes~zer
. . . . . . . . . . . . . .
Diaital control. ~ h a s e locked VCO
.
. ,
Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antenna ~mpedance . . . . . . . . . . . . . . . .
Power requirement
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
Ground~ng
Operat~ng temperature . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
Current dram.
Weight
[Transmitter Section]
RF output power
(at 13.8V DC. 5 0 n load)
FM ( ~ 3 )
5 0 ohms
13.8V DC ?15%
Negatlve
-20°C to +50°C
0.4A in receive mode with no input
s~gnal 9A in HI transmtt mode (Approx.)
Less than 3 mA for memory back up
(from an external power supply
through the BACK UP terminal)
Less than 2 mA for memory back up
(from battery)
175 mm (6-7/8") wide
6 4 mm (2-1/2"J high
2 2 0 mm (8-5/8") deep
(projections excluded)
2.2 kg (4.84 Ibs) (approx.)
..................
Frequency tolerance
Less than
f
2 0
X
(-20°C-
+5OoCI
Spurlous radiat~on
....................
HI Less than
-
6 0 dB
LOW Less than
-
53 dB
Max~mum frequency
deviat~on (FM)
........................
+5 kHz
RPT. Tone burst frequency
.........
1.750 Hz
M~crophone
.............................
Dynamic microphone with PTT swltch.
5 0 0 2
[Receiver Sectionl
..................................
Circuitry
Double
conversion
superheterodyne
lntermed~ate frequency
.............
1 st IF
10.695 MHz
2nd IF
4 5 5 kHz
Rece~ver senstt~v~ty
...................
Better than 0.5 pV for 3 0 dB S/N
Better than 0.2 pV for 12 dB SINAD
Receiver selectlv~ty
...................
More than 12 kHz
(
- 6 dB)
Less than 2 4 kHz
( -
6 0 dB)
Spurlous response
....................
Better than 6 0 dB
Squelch sensltlvity
....................
0.1 6 fiV (threshold)
Auto scan stop level
..................
Less than 0.2 pV (threshold)
Audlo output
...................
. .
.... More than 2.0 watts across 8 ohm
load ( 1 0% dist.)
Note: Circu~t and ratings are subject to change without notice
due to developments in technology.
HI 4 0 Watts mln.
LOW 1 to 15 watts approx.
(According to FREQ.1 .
Var~able reactance dlrect shift
O
1 9 8 1 - 4 PRINTED I N JAPAN
8 5 1 - 0 9 3 6 - 0 0 (K)(M)(W)(TJ 1000
@
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