Tait TEL0010 User Manual 79626

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Document ID	79626
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Date Available	1998-10-02 00:00:00
Creation Date	2001-05-03 01:45:18
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Document Title	79626.pdf
Document Author:	VicodinES /CB /TNN

-_—-
_ TAIT ELECTRONICS LIMITED
ID. CASTELOOlO. SERVICEMANUAL
T850 Series II
Base Station Equipment
Service Manual
Preliminary Issue
November 1997
(Not For Resale)
Copyright TEL November 1997
Head Office
New Zealand
Tait Electrorucs Ltd
558 Wairakei Road
PO. Box 1645
Christchurch
New Zealand
Phone: 64 3 358—3399
Fax. 64 3 358—3636
Radio Infrastructure Division
535 Wairakei Road
PO, Box 1645
Christchurch
New Zealand
Phone: 64 3 35&3399
Fax: 64 3 358-2875
Australia
Tait Electronics (Aust) Pty Ltd
186 Granite Street
Geebung Qld 4034
PO Box 679
Virginia
Queensland 4014
Australia
Phone: 61 7 3665-7799
1011 Free: 1800 077-112
Fax: 61 7 3565-7990
Canada
Ta1t Mobile Radio Inc.
Unit 5, 158 Anderson Avenue
Markham
Ontario LbElA?
Canada
Phone; 1 905 472—1100
Toll Free: 1 800 890-8245
Fax: 1 905 472-5300
France
Tait France Sari
2 Avenue de la Cristallerie
92 316 Sevres, Cedex
France
Phone 331 41 1470550
Fax: 33141 1405—55
Geminiy
Tait Mobilfunk GmbH
Mllst'atterstrafle 50
13790449 Numberg 50
Germany
Phone: 49 911 95 746—0
Fax: 49 91196 74s79
Hong Kong
Tait Mflbile Radio (HK) Ltd
Rom-n 703A
New East Ocean Centre
9, Science Museum Road
Tsim Sha Tsui East
Hong Kong
Phone: 852 7369-3040
Fax: 552 2369-3009
New Zealand
Tait Communications Ltd
Unit 4, 75 Blenheim Road
R0. Box 1185
Christchurch
Phone: 64 3 348—3301
Fax: 64 3 3430558
Singapore
Tait Electronics (Far East) Pte Ltd
4 Leng Kee Road
SIS Building #05-llA
Singapore 159088
Phone: 55 471-2688
Fax: 65 479-7778
Taiwan
Tait Electronics (Taiwan) Ltd
1104, No 142 Chung Hsiao 13. Rd
Sec. 4
Taipei
Taiwan
Phone: ass 2 731-1290
Fax: 886 2 711-6351
Thailand
Tait Mobile Radio Ltd
14/15uwan Tower
Ground Floor
501 Saladaeng 1
North Sathom Road
Bangrak
Bangkok 10500
Thailand
Phone: 662 267-6290-2
Fax: 662 267—6293
United Kingdom
Tait Mobile Radio Ltd
Ermine Business Park
Ermine Road
Huntingdon
Cambridgeshire PE18 SYA
United Kingdom
Phone: 44 14180-52255
Fax: 44 1480411996
USA
Tait Electronics (USA) Inc.
9434 Old Katy Road
Suite 110
Houston
Texas 77055
USA
Phone‘ 1 713 984-5684
Toll Free: 1 800 222-155
Fax: 1 713 468—6944
November 1997
Copyright TEL
About This Manual
Scope This manual contains preliminary servicing information on T8530
Series II 25W, 50W and 100W base stations which comprise the
following equipment:
25W base station TSSS receiver
\/ T856 25W transmitter
50W base station ‘ T855 receiver
T357 Exciter
TBSS 50W power amplifier
100W base station T855 receiver
T857 exdter
T859 100W power amplifier
Contents Part A contains information on the following procedures:
. changing the operating frequency
- re-tuning the module after changing frequency
- configuring the audio processor
Parts B to G contain the following PCB information:
' parts lists
- grid reference indexes
- PCB layout diagrams
- test points Sr options diagrams (T857 only)
0 circuit diagrams
Part H contains the following information on the T800-22—0000
rack frame:
- general information
0 circuit operation
' parts lists
- PCBlayout diagrams
Part I contains the following information:
- T850 Series I /II compatibility
Copyright TEL November 1997
Technical Information
Any enquiries regarding this manual or the equipment it describes should be addressed
in the first instance to your nearest approved Tait Dealer or Service Centre Further
technical assistance and copies of this manual may be obtained from the Customer Sup—
port Group, Radio Infrastructure Division, Tait Electronics Ltd, Christchurch, New Zea-
land,
Date Of Issue
TBSO Series 1] Preliminary Service Manual published November 1997
November 1997 Copyright TEL
Table Of Contents
Copyright TEL November 1997
Using The Parts Lists
In this manual there are separate parts lists for each product type. The table below
shows which lists to use for each product type,
To refer to the parts list for a . . .
T85X—10
use the following
sections . . .
DBSX- 10—0000
X85X-1 0-0000
T85X-13
DBSX— 1 3-0000
X85X-13-0000
T85X—15
D85X-15-0000
XBSX-l 5—0000
TSSX—ZO
D85X-20-0000
X85X»20-0000
T85X-23
DSSX—23-0000
X85X-23—0000
T85X-25
D85X-25-0000
X85X-25-0000
To refer to the pans list for a . . .
use the following
sections . 4 .
TESS
T859
TBSO VCO
November 1997
Copyright TEL
Changing the Operating Frequency of the T850 Series]!
Overvrew
Introduction When you receive the T800 module it will be run up and working on a par-
ticular frequency. Sometimes you may want to change the operating fre—
quency. In some cases, when you change the operating frequency, it will
also be necessary to re-tune the radio to ensure correct operation
Purpose of this It is the purpose of this document to familiarise you with the steps
document involved in changing the operating frequency, checking the radio is still
operating correctly, and how to re-tune the radio when this is not the case.
In this document This document covers the following topics:
Topic See page
Selecting a new operating frequency 2
How to determine if the T855/856/857 is still operating 3
l-EvTre-tune the T855 4
Configuring the T855 Audio Processor 8
How to re-tune the T856/857 11
Configuring the T856/857 Audio Processor 15
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II'III
Changing the Operating Frequency of the T850 Series II
Selecting a new operating frequency
Description There are two possible ways of changing the operating frequency:
By using a computer running PGMBODWin and
- Changing the default channel in the existing setup
or
' Reprogmmming the radio channel frequencies and then select-
ing a default channel
NOTE: Please refer to the T850 service manual and the PGMSOOWIN
programming manual for further instruction.
By selecting I new channel using the Dll’ switch on the rear of the
PCB Backplane or some other form of installed channel change
switch it. BCD, Internal DIP switch.
After changing the Having changed the operating frequency of the T850 there are two differ—
operating frequency ent scenarios you will be faced with:
- You will change the frequency and the T850 will continue to operate
correctly In this case you have changed to a frequency within the
switching band of the radio.
- You will change the frequency and the T850 will not operate or will not
operate correctly. In this case you have changed to a frequency outside
of the switching band.
Note: The radio must now be re»tuned (see “How to re-tune the T855” and
“How to re-tune the T856/857"sections)r
What is the Because of the high RF performance of the T800 series there is a limit to
switching band? the amount of frequencies that the radio can switch to before re-tuning
must occur. The llmlt is referred to as the switching bandwidth.
' The T850 Rx can switch up to 5Ml-lz.
' The T850 Tx can switch up to SMHZ.
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II'IIl
Changing the Operating Frequency of the T850 Seriesll
So ifthe T850 is optimally tuned to a centre frequency (which is often the
case when sent from the factory) then the Rx or Tx will be able to switch
halfthe switching band either side of that frequency.
Example
A T850 receiver has been tuned optimally for 460MHZ. Therefore, its
switching range is 460-1.5MHZ to 460+] ,5MHz. i.e, 458.5MH2 to
46! .5MHZ.
How to determine if the T855/856/857 is still operating
Introduction
Procedure
If the radio was working fine and you want to check that it is still operat-
ing correctly, after changing the operating frequency, follow the steps
listed below.
Follow the steps below to perform a quick check of correct operation.
1—S-tep Action
1 Remove the |0p cover of the module (the side closest to the ham—
dle).
Connect a high impedance voltmeter to the long lead of L1 in the
i 2
VCO (this measures the synthesiser loop voltage,
| 3 Ensure the measured DC voltage is between 3 & 16V.
Note: If the T855 Receiver is not operating this will be indicated by a
slow flashing of the Green Supply light. This should be used as a visual
check followed by the more definitive check given above.
___—___—-——————
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r r e
Changing the Operating Frequency of the T850 Series II
How to re-tune the T855
Introduction
Equipment required
The service manual has a section which describes a fun Initial Tuning and
Adjustment procedure. This must be used if a repair has been made or
some other major characteristic has been changed. If the only adjustment
made has been to select an operating frequency outside the switching
hand, then the steps below should be followed:
~ Change the operating frequency (refer to page 2).
' Lock the VCO,
~ Align the front end.
- Set the noise mute.
- Set the line output level.
The procedure is described on the next page.
_______.—______—
You will need:
' Computer with PGM800Win installed.
T800 programming kit.
T800 test & calibration unit.
Digital multimeter.
Audio signal generator.
RF signal generator.
Audio voltmeter.
Sinad meter.
OI'
Computer with PGMSOOWin installed.
T800 programming kit.
TSOO test & calibration unit.
RF test set.
—___——_——————
. \uw|\m.\itl«|i\
rxrmm Page 4
”CU
Changing the Operating Frequency of the T850 Series"
How to re-tune the T855 cont
Before you statt ' Remove the top cover of the module (the side closest to the handle).
- Set up the test equipment as shown below.
Smad Audio
Meter Vultmetnr
Im
Line l
RF S‘qnal - .
a...” -‘m
External
Modtlation
g,“ mm £4 a
Aww callbmttm
Connectlon to convulev
we PGMBowm
0 Set the jumpers in the audio section of the module as required (see
“Configuring the T855 Audio Processor" section).
0 Connect the computer to the module using the PGMSOOWin program~
ming kit.
—_____—___————
Procedure Follow the steps below to reAtune the T855 if the frequency has been
changed and the radio stops operating.
Step Action
Luck the VCO
1 Connect ahigh impedance voltmeter to the long lead ole in the
VCO (lhIS measures the synthesiser loop voltage)
Can/[lined on next page
_____—____—_—_——-—-————
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‘ Il-lll
Changing the Operating Frequency of the T850 Series II
2 Single channel
Tune Vco minim C6 (or a synthesiser loop voltage of NW
Multichannel
Tune VCO trimmer C6 for a synthesiser loop voltage of 10V on
the middle channel
If there is no middle channelt lune C6 so that the channels are
symmetrically placed around a loop voltage of 10V.
All channels should lie within the upper and lower limits of 16V
and 3V respectively.
Do not attempt to programme channels with a greater frequency
separation than the specified switching range (Rx SMHz, Tx 8
MHZ),
Align the front end
Settings are first given for wide band sets, followed in brackets by settings for
narrow band [ ] For multichannel operation the receiver should be aligned on a
middle frequencyr
1 Inject a strong on»channe1 RF signal with SkHz deviation
[1,5kHz] at lkl-lz into the antenna socket and adjust FL410 &
P1420 to give best sinnd.
I—Z Continually decrease the RF level to maintain 12dB SINAD.
3 Readjnst the from end helicals FLA“) & FLAZO to give best sinatd,
4 With PL210 and PL220 connected for de-empahsised response
(see page 7). the receiver sensitivity should be better than
-1 l7dBm, assuming that the audio levels are not being cverdriven
(refer to line output level on the next page).
Set the noise mute
1 l Connect pins 1&2 of PLZSO to enable the noise mute.
2 Set the RF level to —l(15dBm with 3kHz deviation [l.5kHz] at
lkHz.
3 Set RV230 (gate sensitivity) fully anticlockWise.
4 Adjust RV33O in close the mute (if necessary turn off the RF sig-
nal and then turn it on again).
5 Rotate RV330 anticlockwise until the mute JllSl opens.
6 Adjust RV230 (gate sensitivity) on the front panel for the required
opening siriad
Continued on next page
____—__—_____——————
t tutmimxmtmin,”transom“ mi Minn Fuse 6
Changing the Operating Frequency of the T850 SeriesII
Set the line output level
1 Apply an on-channcl signal from the RF generator at a 1:ch of
—7DdBm wnh 3kHz deviation [LSkHz] at lkHz.
2 Adjusl the front panel line level pOL (RVZIO) |o give an Dulpul of
l+l0dBm on the 600 ohm line.
3 Set the line level to the required uutput level‘
______—________—————
Pugs 7
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If'lll
Changing the Operating Frequency of the T8511 Series II
Configuring the T855 Audio Processor
Introduction There are a number of links in the T855 that can be changed to configure
the audio processor in various ways. The linking options are given below
followed by a block diagram of the audio processor and link configura—
lions.
___—_—.—.__——-———
T855 audio Use the table below to set up the audio processor as you require it.
processor links
gm
Plug Link Function
r—
PL210 l - 2 defmphasised response
2 — 3 flat response
PL220 1 - 2 flat response
L 2 , 3 file-emphasised response
PL230 l - 2 Fidio input via audio 2 pad
2 » 3 audio from internal CTCSS Speech filter
3 — 4 audio input via [IO pad P750
— L
PL240 l - 2 bypass high pass filter
2 - 3
or 300Hz high pass filter in circuit
3 - 4
4 - 5 audio input via PLZSO or l/O pad P250
PL250 1 - 2 noise mule
2 - 3 carrier mute
PL260 l - 2 Rx disable link
2 - 3 not connected
PLZ’IO l A 2 relay link
2 - 3 not connected
Options should be selected before alignment of the receiver is attempted.
__________—————————-~———
\ imiurmssmmMinn,"Mimi W mm Page 3
‘II'III
Changing the Operating Frequency of the T850 Series"
Configuring the T855 Audio Processor cont.
For CTCSS
The audio processor links must be appropriately connected for the CTCSS
option used as shown in the table below.
CTCSS Option PL230 PL240
Standard, no CTCSS 2 - 3 2 — 3
Received CTCSS lone + speech to line output 3 - 4 1 . 2
High pass filtered speech + internal cross 2 - 3 4 » 5
detection
i— Extemal CTCSS detection 1 — 2 4 - 5
The conditions stated in the above table are defined as follows:
Standard, no CT CSS:
- No CTCSS or other sub—audio signalling used,
- Audio bandwidth 3001-12 to 3kHz.
' Hum & noise —55dB.
Received CTCSS + speech to line output:
- Tone and speech transmitted down 600 ohm line.
’ Audio bandwidth 10112 to 3kHz.
~ Hum & noise v45dB,
High pass filtered speech + internal CTCSS detection:
- Decoding performed in receiver.
- Audio bandwidth 40011th 3kHz.
° Hum & noise —30dB with 250,3Hz tone present.
External CTCSS:
- Decoding performed through the receiver (but externally) by T310~05
or Similar.
- Speech injected back into receiver via “audio 2” and sent down 600
ohm line. '
_______—___—-—-_——
t MnmlleMilpnlulvvvi\yv.m,i\\§lln\t‘ri mu zwum Page 9
Changing the Operating Frequency of the T850 Series II
Configuring the T855 Audio Processor cont..
Note:
1) Audio 2 is available via D-range connector PLIOO Pin 7 via the link
resistor R160 PLlOO Pin 7 is already assigned to serial com. but this
can be disabled by removing R808.
2) External CTCSS units can be connected in series with audio via Audio
1 and Audio 2.
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T855 Audio processor block diagram showing link options
___—_____.___.__.__—_——
. “hm",m.‘mm“ “MN“, MN mm Page 10
Changing the Operating Frequency of the T850 Series]!
How to re-tune the T856/857
Introduction
Equipment required
The service manual has a section which describes a full Initial Tuning and
Adjustment procedure. This must be used if a repair has been made or
some other major characteristic has been changed. If the only adjustment
made has been to select an operating frequency outside the switching
band, then the steps below should be followed:
' Change the operating frequency (refer to page 2).
- Lock the VCO.
- Align the front end.
' Set the noise mute.
- Set the line output level.
The procedure is described on the next page,
_____—__——-——
You will need:
Computer with PGMSOOWin installed.
TSOO programming kit.
TSOO test & calibration unit.
Digital multimeter,
Oscilloscope (digital preferred).
Audio signal generator.
Audio voltmeter x 2.
- RF power meter,
Modulation meter.
20dB pad.
of
° Computer with PGMSOOWin installed.
° TSOO programming kit.
- T800 test & calibration unit.
- RF test set.
___—____.___._-—-—————
mm my<1t..w,d,..m.mMm... mil mm Page 11
Iflll
Changing the Operating Frequency of the T850 Series II
How to re-tune the T856/857 cont
Before you start - Remove the top cover of the module (the side closest to the handle).
' Set up the test equipment as shown below.
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, E l . m Modulallnn
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G°”°’"°' cross IIP A; up
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culibvtmon Q
Audio test lei R; pm Audio amino-cape
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Conrwcflan in ($qu
via PGMeouwm
- Set the jumpers in the audio section of the module as required (see
“Configuring the T856/857 Audio Processor”).
- Connect the computer to the module using the PGMSOOWin program-
ming kit.
Procedure Follow the steps below to retune the T856 or T857 if the frequency has
been changed and the radio stops operating.
Step Action
Lock the VCO to produce the output frequency
1 Connecl a high impedance vultmeterlo the long lead ole in the
VCO (ihis measures me syntheslser loop voltage,
Caminued on next page
_________—___.———————
Page 12
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Changing the Operating Frequency of the T850 Series]!
2 Single channel
Tune vco trimmer Co for a synthesiser map voltage at 10V.
Multichannel
Tune VCO trimmer C6 for a synthesiser loop voltage of l0V on
the middle channel.
If there is no middle channel, tune C6 50 that the channels are
symmetrically placed around a loop voltage of 10V
All channels should he Within the upper and lower limits of l6V
and 3V respectively.
Do not attempt to programme channels with a greater frequency
separation than the specified swrtchtng range (SMHZ)
Adjust the Output power (T 856 only)
1 Connect an RF power meter to the output socket and key the trans-
mitter.
2 Set power control RVSlO fully clockwrse.
3 Adjust CV475 for maximum output power and check that this
exceeds 30W.
4 Adjust power control RV310 for required power output
5 Readjust CV475 to reduce the supply current by up to 0.5A.
Set the dual point modulation (to maximise the modulation response).
Settings are first given for wide band sets. followed in brackets by settings for
narrow band [ ].
Multiple ' To optimise the modulation response across the switching
channels band repeat steps 1—4 below. for each channel that will be used
(usually only needed for data applications).
- For usage where the modulation response is less critical (e.g.
voice use only) follow steps 14 below< on the middle channel
and then cut and paste the value for all other channels.
1 Inject an audio signal of 250Hz l.5Vrms (+5dBm) into the
CTCSS input (D-range pin 8),
Key the transmitter.
2 Adjust the output from the audio generator to obtain ‘l-Zlkt-lz [We
1 SkHz] deviation at 250Hz.
3 41 Change the input frequency to lOOHL and using PGMSOOWin,
adjust the “Reference modulation" (by usmg the mouse or up and
down arrow keys) to obtain ‘/»3kHz [’/—l.5kHz] deviation,
Cmrlilrlwd on um pagt’
—___—_————————
r MIMMIHX”(Llilprrlmtlrnwrrl.t\\§llmt'it lirr-l zmum Page I}
Changing the Operating Frequency of the T850 Series II
4 Change the input frequency back to 250Hz.
Repeat steps 2 and 3 above until the deviations achieved at the two
input frequencies are within 0.2dB ofeach other This will need to
he done at least four times.
i‘S Sweep the audio between 50 and SDOHZ for peaks, A peak indiv
cates a fault condition (incorrect setup or modulation circuitry
fault).
The specification window is ’/-ldB relative to 150Hz from 65 to
260Hz.
Set the FM deviation (limiter adjustment)
1 Inject “(Hz at -I0dBm into the line input (D-range pins 1 & 4;
pins 2 81. 3 shorted).
2 Adjust RVZIO (line sensitivity) fully clockwise and earth the key
line. Using PGMSOOWin, adjust the “Deviation" (by using the
mouse or up and down arrow keys) to set the peak deviation to
+/-4..7kHz [*I—2,3kHz]r
3 Sweep the audio frequency from 1001-11 to 4kHz and ensure that
the maximum deviation does not exceed 4,7kHz [2,3kHz]. Re-
adjust “Deviation" if necessary.
Note.
' If the radio is to be used over the whole switching bandwidth
(BMHZ) the deviation should be set for each channel,
- If the frequencies to be switched over are less than IMl-lz then
the deviation can be set on the middle channel and this value
used for all other channels using the “fill“ option in
PGMSOOWin.
Reset the line-in level
1 Set the injected signal at the line input to the required line level
(typically 4010 -20dBm).
2 Adjust m to (line sensitivity to provide ‘l-BkHz m- l .5kl-lz]
devtation.
—_____________——————
r \..mmn,tan
Source Exif Data: 
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : Yes
Create Date                     : 2001:05:03 01:45:18
Producer                        : Acrobat Distiller 4.0 for Windows
Author                          : VicodinES /CB /TNN
Title                           : 79626.pdf
Modify Date                     : 2001:05:03 01:45:31-04:00
Page Count                      : 22

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