WN.RF DDone-10 DIGITAL User manual

DDone-10 DIGITAL
Digital FM stereo broadcast exciter
Based on DSP and DDS technology
Digital Signal Processing technology
Advanced Direct Digital Synthesizer (1 GSPS, 14-bit DAC)
24-bit A/D, 114 dB Dynamic Range, Sampling Rates up to 192 kHz
Complete digital solution in a compact 1U/19 Inch housing
AUDIO SECTION
Audio connector
RF SECTION
GENERAL SECTION
BLOCK DIAGRAM
E-Mail: [e-mail]
XLR Female
L/R input level ±1.2Vp-p for 75 KHz deviation (1KHz)
Pre-emphasis Flat / 25 / 50 / 75µsec.
Channel separation 60 dB min., ( 65 dB typ. ), 20Hz to 15kHz,
S/N Ratio 80dB with CCIR unweighted
Frequency response ±0.5dB @ 30Hz - 15kHz
Output power < 10W, adjustable
Output impedance
Output connector
Frequency range
Frequency step
RF Spurious
RF Harmonics
Modulation capability
Frequency deviation ± 75 KHz
WFM (F3)
> -80 dBc @ ± 1MHz min.
> -45 dBc
10KHz
87.5 to 108MHz
N,Female
50Ω
Remote Control
AC power
Power consumption (typical)
Ambient temperature
External dimensions ( W x D x H )
Weight
110V or 240V selectable,50/60Hz
RS232, Connector DB9 female
25 W
-5° to +40°C
483mm(19") x 200mm x 44mm(1U)
2.5kg
L+R
L-R
DSP Baseband Processor
ΣΔ ADC
24-bit
fs=192kHz
-1- REV .1
For Production or FM-Airchain Use
OPERATING MANUAL
MAIN FEATURES
Spurious and harmonic suppressione
Encode mode MONO-L, MONO-R, LR-MIX, STEREO
< 75dBc (Typical 80 dBc)

INSTALLATION AND OPERATION
As soon as the equipment is received, inspect carefully for any shipping damage. If damage is suspected,
notify the carrier at once, and then contact supplier.
We recommend that you retain the original shipping carton and packing materials, just in case return or
reshipment becomes necessary.In the event of return for Warranty repair, shipping damage
sustained as a result of improper packing for return may invalidate the Warranty!
Unpacking and inspection
50µs
600Ω
50µs 25µs 25µs
OFF
600Ω
10ΚΩ 10ΚΩ
OFF OFF OFF
RF OUT
LEFT RIGHT
CAUT ION: Conn ec t RF load b ef ore power in g on
Mode l: DDone-1 DIGITAL
Power S up ply: 110 V,50 /60Hz max :25Watt
RF Outp ut : <1Watt
DSP Rev : 2.0
DDS Rev : 3. 5
2 0 1 4 1 0 0 0 2
Made in C hi na
www .10 8mh z.c om
Rear panel diagram
[1] MAINS
[2] REMOTE
[3] LEFT
[4] LEFT ADJ
[5] TOGGLE SWITCH
[6] RIGHT
[7] RIGHT ADJ
[8] RF. OUT
[9] AIR FLOW
[10] GND
-2- REV .1
Standard IEC connector for mains supply 110 or 230 V, +10/-15%
Db9 connector to telemetry the equipment.
XLR connector, for balanced LEFT channel input.
Adjustment trimmer for the LEFT channel input.
Audio input impedance select and pre-emphasis setting.
XLR connector, for balanced RIGHT channel input.
Adjustment trimmer for the RIGHT channel input.
RF output connector, N-type.
Grid for the passage of the air flow of the forced ventilation.
GND
1 2 3 4 5 6
Front panel diagram
Frequency:87.5~108MHz
Left channel audio level
RF output power:0 ~100%
Right channel audio level
Audio input attenuate: -16 ~ 0
Audio encode mode
DIGITAL F M S TERE O
BROADCAST EXCI TER
0dB
-2
-4
-6-8-10
-12-14
-16-18-20
ON/OFF

-3- REV .1
The exciter is able to work in all range frequency without calibration and setting
operations.
The DSP system includes an LCD display and push-button panel for interaction
with the user, and implements the following functions:
. Setting of working frequency.
. Setting of RFoutput power.
. Setting of Mono or Stereo operation.
. Setting of audio level atten...
. Measurement and display of the program level.
The operations that you can perform on the encoder are:
. rotation: modify the paramete,quickly rotation will ...
. pushing: push the button to enter menu or modify project, after the
modification of parameter, push the button to save the new value.
push the button to enter menu: Frequency set
pushing to next project: RF output power set
pushing to next project: Audio encode mode set
pushing to next project: Audio input attenuate set
pushing to save new value and exit

Remote description
2 TX_D
3 RX_D
5 GND
Audio connectors
1 GND
2 Positive
3 Negative
Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The
Left channel audio is used on Mono.) Pin 1 of the XLR connector goes to chassis
ground. Pins 2 and 3 represent a balanced differential input. They may be connected to balanced or
unbalanced left and right program sources.
By bringing the audio return line back to the program source, the balanced
differential input of the transmitter is used to best advantage to minimize noise.
This practice is especially helpful if the program lines are fairly long, but is a good
practice for any distance.
The input impedance can be set at 600Ω or 10KΩ by the toggle switch of real panel.
Toggle switch Set
The toggle switch is use for set audio input impedance and pre-emphasis.
Audio input impedance can set at 10KΩ or 600Ω.
Pre-emphasis can be set at 25µs,50µs,75µs or OFF(flat).
25µs and 50µs can be combine to 75µs.
1
3
2
1
5
69
1 2 3 4 5 6
Right chanel input impedance
Right chanel pre-emphasis
Right chanel pre-emphasis
Left chanel pre-emphasis
Left chanel pre-emphasis
Left chanel input impedance
10KΩ
50µs
25µs
25µs
50µs
10KΩ
600Ω
OFF
OFF
OFF
OFF
600Ω
Up Down
Remote port is a RS–232C compatible serial interface. The baud is 9600 Bps.
Evey framing have 16 bytes.,
Comunication protocol:
The message structure is show below.
When the command has been active, it return ‘OK’, otherwise return ‘ERROR’.
Byte
1
2-6
7
9
10-11
12-14
15-16
8
Description
Head
Frequency
Encode mode
Audio source
Length
087510
1 byte
5 byte
1 byte
1 byte
1 byte
2 byte
3 byte
2 byte
0
0
0
00
080
<CR>
Pre-emphasis
Audio attenuate
RF power
$
Example
0DH 0AH
000 ~ 100 (0 ~ 100%)
00~16
2: 75µs
1: 50µs
0: OFF(Flat)
1: Digtal input
0: Analog input
3: LR-MIX
2: MONO-R
1: MONO-L
0: STEREO
Unit: KHz
Fixed
Comment
End
*
*
*No effects in this version

-
+
TP2 TP1
R201
RF PA
DDS
DSP
ADC
Analog
Process
Power convert
MODULE DESCRIPTION
There are senven section in the main board:
(1) Power :convert positive voltage to negative voltage.
(2) Analog process: Audio input,pre-emphasis process,buffer amplifier.
(3) ADC : Analog to digital convert.
(4) DSP : Digital signal processing. baseband processing,user interface ,drive DDS
(5) DDS : Direct Digital Synthesizer,FM RF generator.
(6) RF PA : RF amplifier with low pass filter.
The user interface board include LCD and rotary encoder .

DC power supply
C139
104
C141
104
C140
104
C142
104
C153
100uF
Q100
Q101
R127
1K
R128
33
R130
33
R129
1K
+11V
-11V
C154
100uF
C157
100uF
C156
100uF
C155
104
C158
104
-12V
+12V
GND
3
V+ 8
NC
1CAP+ 2
CAP- 4
OSC
7
LV
6
VOUT 5
U107
7660A
C100
100uF
DC power schematic :
+11V -11V
U107
Q100
Q101
U107 performs supply voltage conversions from +12V to -12V,after these voltage are supply to
operational amplifier via the filter. final voltage is about ± 11V.
±11V voltage have two test point in the main board. show as below.
Main supply is a 12V DC,supply by a switch power supply. typ. current is about 0.8A(100% RF
output).It used seven regulators to product several voltage use for evey module.
U303U303
+12V U204
U206 U205
U9
U12
VDDEXT
VDDINT
DSP
DDS
X1
OSC Fclk
AVDD1
DVDD
AVDD3
FB
5V
3.3V
1.2V
3.3V
1.8V
3.3V
U107
U106
-12V Audio
processor
ADC
5V
+12V
12V

Audio frequency
50μs
75μs
30Hz 50Hz 100Hz 400Hz 1KHz 3KHz 5KHz 7KHz 10KHz 12KHz 15KHz
0dB
2dB
4dB
6dB
8dB
10dB
12dB
14dB
16dB
18dB
Gain
Audio input and pre-emphasis
C129
S101 D
1uF
TP1
R121
R125 R 123
S101 E
C123
U101 A
R117 R119
C121
C119
C117
W7
R115
R113
R111
C115
R107
R109
C105
C107
S101 F
C101
R103
R101
L101
L103
P101
IN-L
R105 C 103 R164 C131
U101 B
Attach audio inputs to the Left and Right XLR connectors on the rear panel. Pin 1 of the XLR
connector goes to chassis ground. Pins 2 and 3 represent a balanced differential input. They may be
connected to balanced or unbalanced left and right program sources.
The audio input cables should be shielded pairs, whether the source is balanced or unbalanced. For
an unbalanced program source, one line (preferably the one connecting to pin 3) should be grounded
to the shield at the source. Audio will then connect to the line going to pin 2.
By bringing the audio return line back to the program source, the balanced differential input of the
transmitter is used to best advantage to minimize noise.This practice is especially helpful if the
program lines are fairly long, but is a good practice for any distance.
Below circuit show the left channel of audio process. audio is fed in via P101. the impedance is
10KΩ when S101F is close and 600Ω when S101F is open.
S101D and S101E concern the pre-emphasis.these two switch can assemble to provider four pre-
emphasis value: 0,25µs,50µs,75µs.
pre-emphasis is a typ

-
+
TP2 TP1
R201
C212
U207
C208
C225
C238
C231
C230
C224
R213
R214
C219
C229
R207
U206
U205
U204
U9U2
U1
U303
X1
Q2
R19
Q1
U208
U201
U105
X101
P101
P102
S101
R110 R108
R165
C114
R112 C116
U102 U101
C113 C115
R164
R109
R111
R107
C107
C105
U104 U103
C142
R169
C132
R167
R171
R175
R179
C136
C140
R173
C134
R177
C141
R168
C131
R166
R170
R174
R178
C135
C139
R172
C133
R176
C110
C111
U106
L106
C31
C3
C20
C49
R5
R6
C11 R11
U107
Q100 Q101
R119
R106 R104
C102C104
C108
C106
C128 C127
C129
C130
R114
C118
R120
R118
C120
C126 C124 C123
R124
R126
R122
R123
R125
R121
C125
C119
R117 C117 R113
C103 C101
R105 R103
R115
R101
R102
R116
L104 L102 L101 L103
C121C122
P2
P4
U209
C228
C226
C227
R209 R208
C205
R219 R205 R203 R204
R202
R214
R213
R211
C206
C223
C232
C222
C233
C221
R218
C234
R217 C218
C237
C220
C236
R215 C235
C152
C202
L107
U202
P103
C34
C35 R15
C210
C19
L3
C30
C32
C54
C36
C46
C24
C55
C23
C28
R210
R211
C203
R4
R2
R1
R3
R7
C52
FB3
FB4
FB1
FB2
R9
R10
C42C41 C43 C44
C62
C63
R14
R13
L4 L5 L6 C64 C70
C61
R18
C60
R17
C10
C9
C69
C16
L1
R12
L10
C81 C68 C67 C65 C79
C80 C66
L13 L9 L8 L7
L11
C75
C74
C77
C78
L12
C73
C72
C59 C58
C5
C15
C2
C12
C71
R16
C76
C26
C1
T1
C8
C201
C149
R185
C146
C145
C143
C144
R184
R183
C148
R182
C150
C151 L105 C147
R129
C158
R130
C157C156
C155C112
R127
R128
C154
C100
C153
C209
C204
C207
P3
C137
C138
R181
R180
C109
C37
C56
C47
C57
C29
C7
C50
C48
C51
C22 C13
C21 C6
C18
C17
C4
C14
R8
C53
C39
C33
C38
C25
A1
A2