JR NET-ZS75 User manual

Page 1
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
T A B L E O F C O N T E N T S
1.0 INTRODUCTION
1.1 Definition
1.2 Application
1.3 Construction
2.0 ENCODER THEORY OF OPERATION
3.0 THEORY OF OPERATION
3.1 General
3.2 Block Diagram
4.0 FAILURE ANALYSIS
5.0 APPENDICES
5.1 Transmitter Block Diagram
5.2 Transmitter Schematic Diagram
5.3 Transmitter Photographs and ID Labels
5.4 Transmitter Tune-Up Procedure
5.5 Quarts Crystal Specifications
5.6 Test Data

Page 2
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
1.0 INTRODUCTION
1.1 Definition
The Model NET-ZS75 is a transmitter Module for the Remote
Control(R/C) of models such as cars, boats,etc.
and NET-ZS75 is used by plugging into the Transmitter(main body
for control).
This Transmitter module is for FM PLL System, available for the
PPM(Pulse Position Modulation).
The latest type of Model Z-1 will be utilized for the application
of this Transmitter module NET-ZS75.
This Transmitter module is a part of the HORIZON HOBBY DISTRIBUTORS,
INC. PPM "family" of Remote Control Transmitters which at this
time consists of:
Transmitter Model # FCC ID #
NET-J75P BRW8ZCNET72FP
XS3 BRWXS3
XR-3 BRWXR-3
Separate Applications for each transmitters and for the receivers
are submitted as required by the Commission.
The Manufacturer, Japan Remote Control Company (JR),manufactures
all transmitters and receivers.
The PPM family of R/C systems is exported by JR to the United States
of America, and several European and Asian Countries.
The Applicant for this Equipment Authorization, HORIZON HOBBY
DISTRIBUTORS,INC. will, following receipt of Grant of Equipment
Authorization, import only those versions of these R/C radios
which are allowed for use in the USA under the Rules and Regulations
of the Federal Communications.
The 75 - 76 MHz version of this transmitter is the subject of this
Application; these are the units which will be offered for sale
to the general public.

Page 3
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
1.2 Application
The Model NET-ZS75 R/C transmitter module utilizes
" Phase Locked Loop " and " Frequency Modulation " to convey the
PPM encoded position handle and trigger switches to its companion
R/C receiver, where the PPM encoded pulse train is demodulated,
decoded, and supplied to a number of servo-mechanisms for
positioning of control surfaces, throttle etc. on the model.
The Frequency-Shift-Keying of the transmitter carrier takes place
in the rhythm of the PPM pulse train.
Both transmitter and receiver are very narrow band units; they
have been designed to comply with the European requirements of
10 KHz channel spacing.
1.3 Construction
The Model NET-ZS75 Transmitter module all consists of a plastic
case.
(Reference is made to Fig. 5.1, Transmitter Block Diagram)
* control handle and trigger and switches
* a 8sells dry battery
* an analog-to-digital converter (ADC)
* a microprocessor to create the PPM pulse train
* a modulator driver stage
* a RF power stage
* a telescopic antenna
This Transmitter module is to be made available by the importer
only on those carrier frequencies in the 75 - 76 MHz frequency
band which are at present authorized for R/C use.

Page 4
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
2.0 ENCODER THEORY OF OPERATION
Reference is made to Figure 5.1, Transmitter Block Diagram.
The functions of the encoder are to:
* accept the analog voltages from the control inputs.
(handle and trigger.)
* process the analog voltages to create control mixing, adding,
reversing, etc., as desired by the user.
* sample these voltages in a cyclic rhythm under control of the
system's internal timing generator.
(This process is called commutation.)
* process these analog voltages into binary weighted digital
control words by means of an Analog-to-Digital Converter
(ADC).
* store these digital representations of the analog control
input into a temporary memory (RAM).
* supply this serial data stream to a buffer-driver for
modulation of the RF Transmitter.
* provide "housekeeping" of the encoding process by means of a
quarts crystal controlled internal clock.
* provide supply voltages to the RF section (Vcc = 12V battery
voltage; Vreg = 5.0V regulated voltage).
The entire program which controls the timing housekeeping,
parallel-to-serial conversion process, and insertion of
Synchronization words and error detection codes is governed
by a Central Processing Unit (CPU) under control by an
internally stored program residing in Read-Only Memory (ROM).
The CPU, RAM and ROM are all part of a single-chip microprocessor.
Resolution of the Analog-to-Digital conversion process is ten
(10) bits for a control accuracy of 1:210 .

Page 5
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
3.0 THEORY OF OPERATION
3.1 General
The RF Transmitter itself is located in a plug-in,
hermetically sealed, module.
It operates on any of the R/C frequency (Channels)
allowed by the Commission in the 75 – 76 MHz frequency band.
Selection of the desired RF channel is made by PLL frequency data.
This transmitter employs Frequency-Sift-Keying (FSK)of the carrier
frequency, whereby the output frequency is either
low or high due to the symmetrical FSK modulation process, the
(center)output frequency cannot be directly measured, but must be
calculated by taking the average of the high and low frequency
states.
The peak-to-peak deviation of the FSK signal is approximately 3.6
KHz ("sliver modulation")
Because of the unfamiliarity of the general public with the
term FSK, this modulation technique is commonly named FM.
mm
flow fhighfC
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f center =

Page 6
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
3.2 Block Diagram
(Reference is made to Figure 5.1)
The (up to) four control potentiometers are at the upper right
side of the schematic drawing.
The control potentiometer, which is mechanically coupled to the
control handle and trigger,is supplied with the regulated 5.0V
voltage.
The wiper on this pot is exactly centered in the neutral control
handle and trigger position. All analog processing is performed
as deviations from this center (reference) voltage.
After the mixing of each channel, control voltage is changed to
Pulse Train, through encoder circuit.
The Q11(2SC4519)is an LC-type VCO(Voltage Controlled Oscillator),
which is designed to oscillate with about 75.650MHz. Its output is
led to amplifying stage for transmitting through a buffer(Q12),while
it is also led to the PLL through a buffer(Q13). The pulses generated
by the CPU are transferred to the VCO so as to modulate the radio
wave. this part is strictly shielded from electric/magnetic noise.
The IC3(BU2630F)is a PLL(phase Lock Loop).
Exact 13.000MHz is generated by an internal crystal oscillator, and
divided by 5,200 for 2.5kHz.
VCO wave is also divided by a definite number, which is 30,260
in case of 75.650MHz,for getting 2.5kHz.
Two 2.5kHz’s are compared in the phase and the VCO is so controlled
that the error gets minimum, while the modulation is so fast that
the filter between the PLL and the VCO cancels an error fluctuation.
Frequency data is stored in the IC1(MC68HC908QY1/CPU) as an
above-mentioned dividing number, and transferred to the PLL as the
serial data while the transmitter is in normal operation mode.
Frequency data can be changed only in system set-up mode with the
power of the RF section being cut.
Directly after it has turned on normally, though the CPU starts
sending the PLL the data. Then, supply the power to Q1 via Q8(2SC4738)
and Q7(2SA1298) to start oscillation.

Page 7
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
the radio wave is still silent because the RF amplifier (Q1,Q2)is
not supplied with the power yet. After a while, certain stabilizing
time for the PLL, the Q6(2SC4738) and Q4(2SA1298)starts to supply them
with the power so that the radio wave is transmitted.
Q2 drives the Power Amplifier (PA). The straight-through PA stage(Q3)
is followed by a matching and band pass/low-pass network.
This network matches the low PA stage output impedance to the whip
antenna.
DC Supply Voltage enter the RF section: 12 Volt "law" battery voltage
supplies the PA stage only. PLL stages, and bias current for all
stages, including the PA, are derived from the regulated 5.0 Volt.
4.0 FAILURE ANALYSIS
A failure analysis was conducted to ascertain that single-component
failure will not result in unauthorized radiation.
It should be noted that component failure would result in return
of the unit to the factory, or to an authorized repair station.
(Reference is made to Figure 5.2, Transmitter Schematic Diagram)
Failure of any of the transistors (predominant failure mode:
emitter-collector short) will result in the unit becoming
inoperative: In the case of Q11 oscillator short, RF output will
be non-existent.
Q12,Q1,Q2 or Q3 failure will result in very low, if any, output.
Failure of the MOD IN input (latch at 0 or 12 Volt)or modulator
transistor Q9, Q10 and variable diode D4 (open or short) will result
in carrier frequency.
Although this failure would render the unit inoperative, the
frequency tolerance would still fall within the channel bandwidth
and tolerance requirements of .002% of 75 MHz = 1.50 KHz.
When PLL circuit is broken, for example, crystal X1 break down, or
IC101(BU2630) for PLL is broken, PLL will stop functioning.

Page 8
Technical Report
Transmitter Module Model NET-ZS75
FCC ID# BRWNETZS75
5.4 Transmitter R.F. Tune-Up Procedure
1. Remove 2 screws from transmitter Module. Remove PC assembly.
Put PC assembly on bench, component side up.
2. Refer to transmitter schematic Figure 5.2.2.
Soften bee’s wax on cores in L1, L2, L3, L4 ,L5 and L6.
Using oscilloscope with small 50 ohm loop, starting at L1,
adjust these cores for maximum oscilloscope reading.
Repeat this tuning sequence until no further increase in
oscilloscope reading can be obtained.
3. Extend the aerial, and adjust L1, L2, L4, L5, L6
(in this order) to get maximum output. Try 2 times.
4. Shorten the aerial, and adjust L4 to make the current minimum.
5. Extend the aerial fully, and adjust L5 and L6 to get peak.
6. Adjust the frequency.
First, set up the Spectrum Analyzer.
Level Scale is : Log = 5dB/Div, Center Frequency = 75.650Mhz,
Span = 5KHz, RBW = 1KHz, VBW = 1KHz.
Then adjust the Amplitude and Attenuator to the right level.
Then, transmit the frequency Band 75 (75.650Mhz) from the Standard
Transmitter. Then store wave form to the Spectrum Analyzer.
By using VC2 and P2 and p1 in the transmitter, adjust it to make
the same wave form.
7. Confirm the power.
8. Using spectrum analyzer with small 50 ohm loop, verify that
sub harmonic and harmonic components are at least 50dB below
carrier component. Pay special attention to 144MHz components.
9. Remove PCB assembly from Transmitter. Reapply bee’s wax to L1,
L2, L4 , L5 and L6. Put PCB assembly back into its case, replace
the 2 screws.

U1 MPU
VR1:Steering Wheel
VR2: Throttle Triger
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9
SW10 SW11 SW12 SW13 SW14 SW15 SW16
SW17
Voltage Reg(5V)
Key SW
GD PCB
Trim PCB
VDD
Power Supply
DC 9.6-12.0V
Dry Battery or Ni-cd battery Pack
BUZZER
Phone Terminal
Power Indicator
TH:ABS Indicator
TH:Speed Indicator
TH:ACC Indicator
LCD Panel
LCD Back Light
Buf Buf
Sig Out
to RF Module
DSC Output
Clock Crystal
(RF-501F)
Charger Terminal
FCC ID# BRWNETZS75 Figure 5.1.1 Transmitter Block Diagram
Page 9

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FCC ID# BRWNETZS75 Figure 5.1.2 Transmitter Block Diagram
Transmitter Module NET-ZS75
Page 10

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FCC ID# BRWNETZS75 Figure 5.2.1-1 Transmitter Schematic Diagram
Page 11
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FCC ID# BRWNETZS75 Figure 5.2.1-2 Transmitter Schematic Diagram
Page 12

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CH47p
3R
3
3
1
C
p5HC
2C
301
R1
100
2
3
C
301
L8
HW601
03C
2
0
1
R16
47k
71R
k01
R25
10k
94C
2
0
1
C80
B471
TP
R58
3.3k
09C
301
D1
JPW
88C
5
01B
R55
NON
1
8
C
374B
3
5R
k8.6
25R
74
R51
2.2k
R54
10k
R49
100k
C18
CH30p
C13
NON
61
C
NON
01R
k3.3
C25
CH5p
C22
NON
C19
NON
21C
NON
SW1
X1
2
C
81
C
4
8
9
2
1
0
4
3
7
65
L5
TP-7T
L4
TP-6T
Q3
2SC4910
21R
8.
6
3
1R
8.6
41R
8.6
4
1C
201
02C
P
0
01HC
32
C
p
3
3HC
7R
2
2
6R
k3.3
5C
20
1
Q2
2SC4519-6
Q4
2SA1298Y
1
3C
2
0
1
93C
40
1
4
2R
k01
Q6 2SC4738Y
53C
NON
+
R9
220
92R
k01
R30
10k
C21
CH15p
R26
39k
4C
301
R4
JPW
L1
TS-72S
1 2 3
6 4
L2
TS-72S
1 2 3
4 6
SW2
X10
2
C
81
C
4
0 5
1
2
6 9
8 73
4
ANT
CN1
7B GND 8B Vcc 9B GND
10B MOD
ANT.
C11 CH150p
IC2
78L05F
1
O
2
G
3I
D7
HSC119
65
C
V3
.6
/F
u
0
1
85C
301
R64 10k
65
R
NON
C94
NON
6D
NON
R63 10k R65 10k
02
R
k01
24C
2
01
R21
10k
R19
10k
Q5
2SC4738Y
Q13
2SK882
R50
1k
C78
CH47p
04R
k74
3D
092VS1
C63
CH7p
11L
Hu22.0
VC1
6pF
1
4R
k01
2
4R
k21
4D
0
9
2VS1
86C
p
2HC
66C
p28
HC
76
C
p86HC
27C
p1HC
C73
CH3p
R46
680
74R
k
6
5
Q12 2SK882
84R
0
65
C74
C
CH22p
0
7C
201
34R
k74
96C
N
ON
C62 UJ4pF
C65
CH12p Q11
2SC4519-6
1
P
k
1
25C
174B
63R
9
3
4
5C
NON
Q9
2SC4738Y
Q10
2SC4738Y
C53
B182J
R37
180
15C
20
1
R31
10k
R33
39k
8
3R
0
2
8
06C
4
0
1
R39
3.3k
55C
274B
26R
k01
R61
47k
C50
102
Q7
2SA1298Y
Q8 2SC4738Y
L15A
10
44
R
0
8
1
54R
3
3
28C
301
72R
k
0
1
04C
NON
14C
sc
i
ma
r
eC
V3.6/Fu01
+
38C
s
c
im
ar
eC V3.6/Fu01
+
74C
mulatn
aT
V
3
.
6
/F
u
0
1
+
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mulatnaT
V3.6/Fu01
+
67C
mulatnaT
V
3
.
6/F
u0
1
+
97C
mulatnaT
V3.6/Fu01
+
98C
mulatnaT
V3.6/Fu01
+
44C
NON
2CV
Fp6
X1
13.00MHz
IC3
BU2630F
1XIN 2Vss 3RPD 4P-R 5RON 6F-R 7CE 8CK 9
DA
10
LD
11
F-T
12
TON
13
T-P
14
TPD
15
VDD
16
XOUT
CN3
1 2 3 4
CN2B
1B 2B 3B 4B 5B 6B
C64
CH10p
9
5C
V02/Fu1
CN2
1 2 3 4 5 6
IC1
MC68HC908QY1 TSSOP
1PTA0 2PTB1 3PTB0 4Vss 5VDD 6PTB7 7PTB6 8PTA5 9
PTA4
10
PTB5
11
PTB4
12
PTA3
13
PTA2
14
PTB3
15
PTB2
16
PTA1
OSC1 OSC2
IRQ RST
R57
100k
5D
B053CVH
5
1C
301
C27
103
51R
0
7
4
7L Hu3.3
CN4
1
D
D
V
Q
RI
zzub/FR.jdAATAD
DNG
M
8
.21N
I
WS.KHC
1A
TP
2
AT
P
2P k74
CN3B
1B 2B
Mod
3B
Duty
4B
95
R
k7.4
5
3R
k22
23R
k
8
.
5
L6
TP-5T
71
C
p
6
5
HC
C87
UJ 56p
68C
p5 JU
58C
p51JU
L9
HW601
A21L
106WH
41L
1
0
6WH
A8L
WPJ
011
C
301
81
R
k
0
1
3
3
C
sci
m
areC
V3
.
6/Fu
0
1
+
43C
301
Q1
2SK882
2
R
k
0
1
FCC ID# BRWNETZS75 Figure 5.2.2 Transmitter Schematic Diagram
Page 13

Page 14
SPECIFICATION OF CRYSTAL UNIT
1.FREQUENCY 13.000000MHz
2.HOLDER TYPE SMD SX-2112
3.FREQUENCY TOLERANCE +- 20 PPM / +25C
4.EQUIVALENT RESISTANCE 30 OHM MAX / SERIES
5.OPERABLE TEMPERATURE RANGE -30C --------- +80C
6.TEMPERATURE DRIFT +- 10 PPM
7.LOADING CAPACITY 10 PF
8.DRIVE LEVEL 20 uW
9.SHUNT CAPACITY 1.8 PF MAX
10.MODE OF OSCILLATION FUNDAMENTAL
11.INSULATION RESISTANCE 500M OHMS MIN AT 100V DC
12.SHOCK TEST
DROPPING FROM 120cm HIGHT 10 TIMES HARD WOODEN BOARD
( Drop it onto a hard wooden board ( Thickness : 30mm ) hor 6 directions ( XX’YY’ZZ’ ),
This should be 1 cycle )
VARIATION : FREQUENCY LESS THAN +-2 PPM
: RESISTANCE LESS THAN 2 OHM or +- 15 % ( wnichever is lager )
13.VIBRATION TEST
FREQUENCY 10 TO 55Hz ; AMPLITUDE 1.5mm P-P 1 MINUTES
TEST TIME : XYZ each direction 2h
VARIATION : FREQUENCY LESS THAN +-2 PPM
: RESISTANCE LESS T THAN 2 OHM or +- 15 % ( wnichever is lager )
14.AGING
+- 1 PPM max / YEAR
Figure 5.5 Crystal Specification

Page 15
FCC ID# BRWNETZS75

Page 16

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FCC ID# BRWNETZS75

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FCC ID# BRWNETZS75