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| Document ID | 79356 |
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| Date Submitted | 2000-01-04 00:00:00 |
| Date Available | 1998-11-05 00:00:00 |
| Creation Date | 2001-05-02 18:35:21 |
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| Document Lastmod | 2001-05-02 18:35:34 |
| Document Title | 79356.pdf |
| Document Author: | VicodinES /CB /TNN |
TAIT ELECTRGIICS LIMITED
ID: CASTEL0008. SERVICE MANUAL 1
TBSO Series II Preliminary Sen/ice Manual
T850 Series |I
Base Station Equipment
Service Manual
Preliminary issue
November 1997
(Not For Resale)
T1350 Series II Preliminary Service Manual
Head Office
New Zealand
Tait Electronics Ltd
558 Wairakei Read
PO Box 1645
Chrigtchurch
New Zealand
Phone. 64 3 35&3399
Fax: 64 3 358-3636
Radin Infrastructure Division
535 Wairzikei Road
PO. Box 1645
Christehurch
New Zealand
l’hune: 64 3 358-3399
Fax: 6-1 3 358—2825
Australia
Tait Eleclmnics (Aust) Pty Ltd
186 Granite Street
Geebung Qld 4034
PO Box 679
Virginia
Queensland 4014
Australia
Phone 61 7 38657799
Toll Free: 1800 0774112
Fax: 61 7 3865—7990
Canada
Tait Mobile Radio Inc,
Unit 5, 158 Anderson Avenue
Markham
Ontario L6E1A9
Canada
Phone: 1 905 472—1100
Toll Free' 1 800 590-8248
Fax: 1 905 472-5300
France
Tait France Sarl
2 Avenue de la Cristallerie
92 316 Sevres, Cedex
France
Phone: 331 41 14-05-50
Fax: 331 41 14-05-55
Germany
Tait Mobilfun k Gmbl—l
Willstatterstrafie 50
D-904-i9 Numberg 60
Germany
Phone 49 911 96 746—0
Fara-19 911 96 746-79
Hong Kong
Tait Mobile Radio (HK) Ltd
Room 703A
New East Otean Centre
9,5c1ence Museum Road
Tsirri Sha Tsui East
Hong Kong
Phone: 852 2369-3040
Fax 852 2369-3009
New Zealand
Tait Communications Ltd
Unit 4, 75 Blenheim Road
PO Box 1185
Christchurch
Phone 64 3 348-3301
Fax: 64 3 34}0558
Singapore
Tait Electronics (Far East) Pie Ltd
4 Leng Kee Road
515 Building 150311A
Singapore 159085
Phone: 65 471-2688
Fax’ 65 47947778
Taiwan
Tait Electronics (Taiwan) Ltd
1104,No.142 Chung Hsiau E. Rd
Sec. 4
Taiper
Taiwan
Phone: 886 2 731-1290
Fax: 886 Z 711-6351
Thailand
Tait Mobile Radio Ltd
14/1 Suwan Tower
Ground Floor
Sor Saladaengi
North Sathom Road
Bangrak
Bangkok 10500
Thailand
Phone: 662 267~6290~2
Fax 662 26776293
United Kingdom
Tait Mobile Radio Ltd
Ermine Business Park
Ermine Rnad
Huntingdon
Cambridgeshire PE18 6YA
United Kingdom
l’hnne: 44 1480-5235
Fax: 44 1480411996
USA
Tait Electronics (USA) Inc.
9434 Old Katy Road
Suite 110
Hauston
Texas 77055
USA
Phune:1713 984-5684
Toll Free: 1 800 22271255
Fax" 1 713 468-6944
T850 Series ll Preliminary Serwce Manual
About This Manual
Scope
Contents
This manual contains prelimin
ary servicing information on T850
Series II 25W, 50W and 100W base stations which comprise the
following equipment:
T85S receiver
’ T856 25W transmitter
25W base station
T855 receiver
T857 exciter
T858 50W power amplifier
50W base station
T2355 receiver
T857 exciter
T859 100W power amplifier
100W base station
Part A contains information on the following procedures:
0 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
0 grid reference indexes
- PCB layout diagrams
' test points 81: options diagrams (T857 only)
- circuit diagrams
Part H contains the following information on the TBOO-ZZ-OOOO
rack frame:
general information
circuit operation
parts lists
PCB layout diagrams
Part 1 contains the following information;
0 T850 Series] /lIcompat-ibi1ity
4 Test) Series II Preliminary Service Manual
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 Divisron, Tait Electronics Ltd, Christchurch, New Zea—
land.
Date Of Issue
T850 Series II Preliminary Service Manual published November 1997
T850 Series II Preliminary Sen/me Manua\ 5
Table Of Contents
6 TBS!) Series ll Preliminary Service Manual
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 . . . use the following
sections . . l
D85X-10—0000
TSSX-IO X85X-lO-0000
D85X-1 3-0000
XSSXAI 341000
DBSX-l 5-0000
XBSX-l 5-0000
DBSX-ZO-OOOO
X85X-20-0000
D85X»2370000
X85X-23-0000
DBSX-ZS-OOOO
X85X-25—0000
T85X-13
T85X-15
T85X720
T85X-23
T85X725
use the following
sections . . .
To refer to the parts list for a . . l
T858
T859
T850 VCO
Changing the Operating Frequency of the T850 SeriesII
Overview
Introduction
Purpose of this
docu ment
In this document
___________————
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.
________———————
It is the purpose of this document to familiarise you with the steps
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,
_____’___—————
This document covers the following topics:
Topic See page
Selecting a new operating flequency fi_ 2
How to determine if the T855I856/857 is still operating 3
How to re»tune the T855 4
Configuring the T855 Audio Processor 4 8
How to re-tune the T856/857 11
Configuring the T8561857 Audio Processor 15
Changing the Operating Frequency of the T850 Series II
Selecting a new operating frequency
Description
after changing the
iperating frequency
W hat is the
iwitching band?
There are two possible ways of changing the operating frequency:
Method ] By using a computer running PGMflmWin and
~ Changing the default channel in the existing setup
or
- Reprogramming the radio channel frequencies and then select-
ing a default channel
NOTE: Please refer to the T2350 service manual and the PGMSOOWIN
programming manual for further instmcrmn
Method 2 By selecting a new channel using the DIP switch on the rear “mic
PCB Backplane or some other form or installed channel change
swilch ice. BCD, Internal DIP switch.
Having changed the operating frequency of the T850 there are two differ?
ent scenarios you will be faced with:
- You will change the frequency and the T850 will continue to operate
correctlyt 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 bandi
Note: The radio must now be re-tuned (see “How to re»tune the T855” and
“How to re—tune the T856/857”sections).
Because of the high RF performance of the T800 series there is a limit to
the amount of frequencies that the radio can switch to before re-tuning
must occur, The limit is referred to as the swnchmg bandwtdth.
- The TSSO Rx can switch up to SMHZ.
- The TBSO Tx can swrtch up to 8MHz.
Changing the Operating Frequency of the T850 SerieslI
So if the 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
half the swnching 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
461.5MHZ.
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 con'ect operation.
{ Step Action
1 Remove the top cover of the module (the side closest to the han-
dle).
2 Connect a high impedance voltmeter to the long lead 43le in the
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.
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 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
hand, then the steps below should be followed:
~ Change the operating frequency (refer to page 2).
' Look 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.
T800 programming kit.
T8001est & calibration unit.
Digital multimeter.
Audio signal generator.
RF signal generator.
Audio voltmeter.
Sinad meter,
or
Computer with PGMSDOWin installed.
TSOO programming kit.
TSOO test & calibration unit,
RF test set.
Changing the Operating Frequency of the T850 Series”
How to re-tune the T855 cont
Before you start
Procedure
______—__.———————
~ Remove the top cover of the module (the side closest to the handle).
' Set up the test equipment as shown below.
Smad Audm
Meter Valtmeter
Q1 0
the 1
r x RFIn ,
22322; ———74Remlver Lm soon '
Exlemul ‘
Modulation i
, v recomm’
A333“??? lcammw
Connection to computer
via PG
- Set the jumpers in the audio section of the module as required (see
“Configuring the T855 Audio Processor“ section).
~ Connect the computer to the module using the PGMBOOWin program»
ming kit.
Follow the steps below to re—tune the T855 if the frequency has been
changed and the radio stops operating.
Step Action
Luck the VCO
1 Connect a htgh impedance voltmeter (0 the long lead ole in the
VCO (this measures the synthesiser loop voltage)
Cmmrmed on next page
Changing the Operating Frequency
of the T850 Series II
Single channel
Tune vco lnmmcr co for a syntheSiser loop voltage at 10V.
Multichannel
Tune VCO trimmer C6 for a synthesiser loop voltage of 10V on
the middle channel
lfihcrc Is no middle channel. tune 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 swuehing range (Rx SMHz, Tx 8
MHL)
narrow band
middle frequ
Align the front end
Settings are first given for wide band sets, followed in brackets by settings for
l ] For multichannel operation the receiver should be aligned on a
eney.
1 i Inject a strong on~channel RF signal with 3kHz deviation
[1.5kHz] at lkHz into the antenna socket and adjust HAIO &
FL420 to give best sinad,
Continually decrease the RF level to maintain lZdB SINAD.
Readjusi the from end helicals Fl/tlo & HAZO to give best sinad.
With PL210 and PL220 connected for de-empahsised response
(see page 7), the receiver sensuivity should be better than
vll7dBmt assuming that the audio levels are not being overdriven
(refer to line output level on the next page).
Set the no
ise mute
Connect pins 1&2 of PLZSO [0 enable the noise mule.
Sel the RF level to - lO5dBm with 3kHI dEVlallDl’l [l.5kHz] at
IRHL.
Set RVZZO (gate sensitivity) fully anliclockwnse
Adjust Rv330 to close the mute (if necessary turn off the RF 5th
nal and then turn Il on again),
LII
Rotate RV330 anticlockwise until the mute rust opens
Adlust RV230 (gait: sensitivity) on the trout panel for the required
(ipcnmg xint’id.
CHIlImNt’d ml um page
Changing the Operating Frequency of the T850 Series”
Set the line output level
1 Apply an oil-channel signal from the RF generator 3! a lcvel of
A70dBm wuh 3kHz deviation [1,5kHz] at lkHz.
2 AdJUSI the from panel line level pm. (RVZIO) to give an output of
+l0dBm on the 600 ohm line
3 Sex the hue level [a the requlred outpul level
Changing the Operating Frequency of the T850 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-
tions.
______—_._.—————
T855 audio Use the table below to set up the audio processor as you require it,
processor links
General
Plug Link Function
PLZ 10 1 . z de-emphastsed response
2 — 3 flat response
PL220 1 - 2 {lat response
2 ~ 3 de-emphasised response
PL230 l » 2 audio input via audio 2 pad
2 - 3 audio from internal CTCSS speech filter
3 - 4 audio input via 1/0 pad P250
PL240 l » 2 bypass high pass filter
2 - 3
or 300Hz high pass filter in circuit
3 A 4
4 - 5 audio input via PL230 or 1/0 pad P250
PLZSD l , 2 noise mute
2 - 3 carrier mute
PLZGO I - 2 Rx dlsahle link
2 - i not connected
PL270 l - 2 relay link
2 — 3 not connected
Options should be selected before alignment oithe receiver is attempted.
Changing the Operating Frequency of the T850 Seriesll
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 tone + speech to line output 3 - 4 I - 2
High pass filtered speech + internal CTCSS 2 , 3 4 ~ 5
detection
External CTCSS detection 1 - 2 4 - 5
The conditions stated in the above table are defined as fol ows:
Standard, no CTCSS:
- 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 lOHz to 3kHz.
- Hum & noise -45dB.
High pass filtered speech + internal CTCSS detection:
- Decoding performed in receiver.
- Audio bandwidth 4001-11 to 3kHz,
' Hunt 81 noise —30dB with 250.3Hz tone present.
External CTCSS:
- Decoding performed through the receiver (but externally) by T3 10-05
or similar.
- Speech injected back into receiver via “audio 2" and sent down 600
ohm line.
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 PLlOO Pin 7 via the link
resistor R160. PLIOO 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.
as
l , M inc/v
Mai-saw- 5:3— mm 7 ,
‘l izv
can-M Hf” z “W M“
2. ea-OIP
via-omn- ""
51260, /——H (mum
o mam-
m —"—|m I EPA, 3.4. WW?
Mm|~flv2
anal-uni
T855 Audio processor block diagram showing link options
Changing the Operating Frequency of the T850 SeriesII
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.
- T2300 programming kit.
- TSOO test & calibration unit.
- Digital multimeter.
' Oscilloscope (digital prefened).
' Audio signal generator.
- Audio voltmeter x 2.
- RF power meter.
- Modulation meter.
- ZOdB pad.
or
- Computer with PGMSOOWin installed.
- TSOO programming kit.
0 TSOO test & calibration unit.
- RF test set.
Ihanging the Operating Frequency of the T850 Series II
How to re-tune the T856/857 cont
lefore you start - Remove the top cover of the module (the side closest to the handle),
' Set up the test equipment as shown below.
me
mas pad, axctm t' saunas?
was pad' tmnsmmar
HEW, Emu" RF 9!” g m Mosulafiwn
Aunts 60°“ 3 Transmittar l m"
SEMI-tar C'lCSS VF L AF O/F
0 J feoo test at m m
l cuibvctvon
Audio L W 59' RF Power Auum Osclllnsmps
Voltmutov Mater anlmabr
Connection to compmat
we PGMaoowtn
- 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.
___—._.____—-————-—
)rocedure 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 Connect a high impedance voltmeter to Ihe long lead ol'L] in the
VCO (this measures the synthesiscr lnop voltage.
Continued 1m netl page
Changing the Operating Frequency of the T850 SeriesII
Single channel
Tune VCO lnmmer C6 for a synthesise! loop Voltage of lOV
Multichannel
Tum: VCO trimmer C6 for a synthesiser loop voltage of 10V on
the middle channel.
If there is no middle channel, tunc C6 so that the channels are
symmetrically placed around a loop voltage of 10V.
All Channels should lie within the upper and lower lll'nllS of 16V
and 3V respectively.
Do not attempt to programme channels with a greater frequency
separation than the specified switching range (SMHZ).
Adjust the Output power (T856 only)
1 Connect an RF power meter to the output socket and key the trans-
mitter.
2 Set power control RV310 fully clockwise
3 Adjust CV475 (or 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 14 below, for each channel that will be used
(usually only needed for data applications),
- For usage where the modulation response is less critical (eig.
voice use only) follow steps 1-4 below, on the middle channel
and then cut and paste lhc value (or all other channels
1 lnjctl an audio Signal of 250H7. l SVrms («tidEmJ into the
CTCSS input (Derangc pin 8).
Key the transmitter
2 AdJuSl the output from the audio generator to obtainV-Skl—lz l‘l—
l.5l(Hz| deviation at 250H7.
3 Change the input frequency to IOOH7 and using PGMSOOWin.
fldJuSl the "Reference modulation" (by using the mouse or up and
down arrow keys) to obtain */—3kl-{/ [‘/-l.5kHL| deviation,
("mm/mad on rim puxu
Ihanging the Operating Frequency of the T850 Series II
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 ufeach other This will need to
be done at least four times.
Sweep the audio between 50 and 300Hz for peaks. A peak indi-
cales a fault condition (incorreer setup or modulation circuitry
fault).
The specification window is ‘lrldB relative to ISOHZ from 65 to
260Hz,
Set the FM deviation (limiter adjustment)
Inject lkHz at -lOdBm into the line input (D-range pins 1 & 4;
pins 2 & 3 shorted)
Adjust RV210(line sensitivuy) fully clockwise and earth the key
line. Using PGMBOOWin, adjust the "Deviation" (by using the
mouse or up and down arrow keys) to set the peak deviation to
+l—4.7kHz ['/-2.3kHz].
Sweep the audio frequency from 1001-12 to 4kHz and ensure that
the maximum deviation does not exceed 4.7kHz [2.3kl—lz]. Re-
adjust "Deviation" if necessary.
Note:
- If the radio is to he used over the whole switching bandwidth
(SMHZ) the deviation should be set for each channel.
- If the frequencies to be swuehed over are less than lMHz then
the deviation can be set on the middle channel and this value
used for all other channels usmg the “fill” option in
PGMSOOWin,
Reset the line-in level
Set the injected signal at the line input to the required line level
(typically —lO m -20dBm).
Adjust szm (line Sensitivity to provide '/~3kl—lL Misti-ix]
dCVlLllH)“
Changing the Operating Frequency of the T850 Series”
Configuring the T856/857 Audio Processor
Introduction There are a number of links in the T856/T857 that can be changed to con-
figure the audio processor in various ways. The linking options are given
below followed by a block diagram of the audio processor and link config-
urations.
T856/T857 audio Use the table below to set up the audio processor as you require it.
processor links
General
Plug Link Function
PL205 (A) l » 2 not connected
(B) 3 - 4 microphone pre-ampl output to compressor input
(C) 5 - 6 microphone pre-amp. output to multiplexer input
PLZlO (L) l - 2 multiplexer output to pie-emphasis input
(M) 3 - 4 multiplexer output to limiter input
(N) 5 — 6 multiplexer output to compressor input
PLZIS (G) l - 2 not connected
(H) 3 - 4 compressor output to multiplexer input
(I) 5 — 6 compressor output It) limiter input
(I) 7 - 8 compressor output to pore-emphasis input
(K) 9 » 10 not connected
PL220 (D) i , 2 pre—emphasis output to multiplexer input
(E) 3 - 4 pie-emphasis output to limiter input
(F) 5 - 6 not connected
Zhanging the Operating Frequency of the T850 Series II
Tmical options
PL205 PL210 PL215 PL220
mlCIGphOnc pre-amp. compressed
and pre-emphasised; (B) (L) (H) (E)
3 - 4 1 - 2 3 , 4 3 . 4
line Input rue—emphasised (sland-
ard sm-up)
mlcmphone preamp cumpressed (B) 1M) (1) (D)
and pare-emphasised, 3 » 4 3 » 4 7 — 8 1 - 2
line inpul unprocessed
Continued on ngxr page
lme and microphone compressed (C) (N) (J) (E)
and put-emphasised 5 - 6 5 - 6 7 — 8 3 - 4
mxcmphone pre-ump compressed; (B) (M) (H) (F)
— 3 , 4 3 - 4 5 — 6
line and microphune flat response;
1.
w 3 minus.
m A
f m,
é
all] “no EelMod.
VC
T856/857 Audio processor block diagram
shcwing link options
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