Kenwood R 5000 Service Manual

Page 1

R-5000 KENWQOD

SERVICE MANU L

986-10/87-2 PRINTED IN JAPAN

51-3073-00 (O) 150
,1682
Lfia-Ifsm-QHr
CIRCUIT DESCRIPTION .................... 2 M3430 (MOBILE MOUNT) .................. SS
SEMICONDUCTOR DATA .................. 24 sP-430 (SPEAKER) ....................... 33
DESCRIPTION OF COMPONENTS . . . . . . . 33 vs-1 (VOICE SYNTHESIZER) ................ 88
PARTS LIST ............................ 41 vc-2o [VHF CONVERTER)
DISASSEMBLY .......................... 64 SPECIFICATIONS ...................... 89
PACKING .............................. 68 CIRCUIT DESCRIPTION ................. 89
,I ADJUSTMENT .......................... 69 BLOCK DIAGRAM ..................... 90
LEVEL DIAGRAM ........................ 76 TERMINAL FUNCTION .................. 91
BLOCK DIAGRAM ....................... 76 PARTS LIST .......................... 91
PC BOARD VIEWS/CIRCUIT DIAGRAMS ADJUSTMENT ,
RF UNIT (X4473OIOFOOI .................. 76 PC BOARD VIEWS .............. .100
IF UNIT (x4873000-00) .................. 78 CIRCUIT DIAGRAM .................... 101
- PLL UNIT Ix5073030-00I ................. so INSTALLATION OF OPTIONS
CONTROL UNIT 06373020000 ............ 82 CRVSTAL FILTERS .................... 102
SWITCH UNIT 1X4173000700) .............. 84 V81 ............................... 102
AVR UNIT Ina-3000700) . 84
DISPLAY UNIT Ix54r3010.ooI ............. 84
SCHEMATIC DIAGRAM ........... S. ' ........ 85 VC-2o .............................. 105
TERMINAL FUNCTION ................... 86 SPECIFICATIONS ................ BACK COVER
OPTION FILTER ......................... 87
Caution :

Omional accessmv InstallatIon 7 The User shouId not anempt to Install the ODtIOna: accessory beyond that described in the
overating instructions, AH Installations sholfld be referred to quaII'erO serVIce personnel.

x468:

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R-5000

CIRCUIT DESCRIPTIBN

OVERVIEW

The H-ESUOU is a double-conversion general-coverage
receiver with a first lF (intermediate frequency) of 58.1725
MHZ and second IF of 8.83MHz. (In the FM mode triple
conversion is used with a third lF of 455kHz.) lt can re
ceive AM, LSB, USB, CW, FM, and RTTY signals from
30kHz to 3OMH2, with performance specifications guaran-
teed from 100kHz up. The V020 VHF converter option
extends the receiving range to 108MHz to 174MHz.

interference is removed by an IF filter switching circuit
and O-to-30dB RF attenuator. The receiver also has an
lF shift feature, AF notch filter (not used in the CW
mode). and AF peak filter (CW mode only).

The receivers phaselocked loops operate under mlCVOr
processor control. High frequency stability and accuracy
are achieved by a single-crystal system that prowdes
digital frequency control in 10Hz steps. This includes the
frequencres of the VHF converter.

Other major features of the R5000 receiver are

1, Reduction of many types of impulse noise controlled
by two noise blanker switches and a noise-blanket level
control.

2, Two digital VFOs (Variable-Frequency Oscillators).

3. Direct entry of frequencies thru the use of numeric

keypad,

. A memory that stores band, mode,and antenna (1 or 2)

information for 100 channels.

J>

. Memory scanning and ten types of programmed scanning.

5

6. A built-in timer and dual-time clock.

7. Display dimmer,

B. The VSrl voice synthesizer option Internal installation.

9. Possible interfacing to a personal computer.

10. A rechargeable lithium backup battery for the micro-
processor.

11, A built-in AC power supply (the receiver can also
operate on an external DC power supply).

Frequency Configulation

The R-BOOO operates as a triple-conversion receiver in
the FM mode and as a double-conversion receiver in
other modes. Fig. 1 shows the principal frequencies
used in its signal circuits, Consider an HFAbancl signal
received in the SSS mode. Let TIN be the frequency input
from the antenna, iVCO the local oscillator frequency
input by the first mixer lMle), fl-lET the local oscillator
frequency input by the second mixer lMlXZl, and fBFO
the beatrfrequency oscillator input from the detector. When
fIN is at zerobeat v that is, when the SSS signal is zeroed
in with fiN as the carrier point .. the following relation-
ship holds true '
l1] First IF at the MCF input

(tics-(iii: lst lF(SB.l125MHz)
(2) Second lF at the XF input

151 lFifm T = 2nd |F(8.S3MHZ) ........................ ®

N®

(3) At the detector input
2nd lF- 0(A'r" signal) ............................... ®
(4) Substituting the left side of Eq. l2) into (3) and the
left side of Eq. (1) into (2) gives

fvco,m._mr_fkw 0 .................................. ®
(5) Which can be rewritten as
le:iVCO-"H~ff30 U... ,. ....(5)

Equation ® describes the frequency relationship of the
signal circuits.

V Mixa VHF-VCO
9'. o use.itzs~
"N, 9 (VHF 222,1125MH1
ics~ iLo Mixa 455nm Discni
174MH1

tiN
30m»
30MH2

List! I BJSISMHZ
HET LSB 1.3235an
CW BESISMHI
FSK . 8 EEBSMHZ

BF!)

83.11175th

49.2825MH2 a

Fig. 1 Signal frequency configurations

Consider next the fVCO frequencies from the PLL

circuits.
(1) ln PLLl
At*l, 1 1
Wcm:4€00. 245,34 .................. @,
At *2, 1 >
Mm :200 .Mm. ......................... L72

At *3, fvcoi"=i
(2) ln PLLZ

fvco2 fvCCl "=PLL2 IF

eci+faru+iit.' ------------------- (g

.'.ivl:02:ivC\

+pLL2 lF . .... ... . @

where the Intermediate frequency PLLZ lF is

,_l_. i . .......
PLL2 it»: .30 2 fm N2

(3) ln PLL3
fvcc? *fvnn=PLL3 lF
.'.fvcorivcu."PLL3 lF -------------------

-@
where the intermediate frequency PLL3 lF is.

PLLS ch1lé - %15TD~ N3

......... ®

(4) These equations can be combined by substituting © and
C7) into @to obtain

may: fi -;5TO- % rm ~Nl +rm+nt

=mNa107fifstD+iprn+iuc ------------------------ ®