Tait TEL0064 Base Station Paging Transmitter User Manual Exhibit D Users Manual per 2 1033 c3

Tait Limited Base Station Paging Transmitter Exhibit D Users Manual per 2 1033 c3

Contents

Exhibit D Users Manual per 2 1033 c3

T800 Paging SystemsT800 Paging Systems
A beginners guide to Tait’s paging offerings
Tait Radio Systems
Division
Tait Electronics Ltd August 2002
T800 Paging Systems Page 2 of 2
1 Types of paging modulators/Transmitters
Tait currently manufactures the following paging products:
T800-30-0000 Differential Frequency Shift Keying,
paging board suitable for use with 512 or
1200 baud Pocsag or speech
T800-30-0002 As above but with external frequency
reference.
T800-32-0000 Low Speed Paging Modulator, suitable for
use with 512, 1200 or 2400 baud Pocsag or
1600 baud FLEX.
T800-32-0002 As above but with external frequency
reference.
T837-20-1020 Low Speed Paging Exciter, purpose built
VHF exciter for use with 512, 1200 or 2400
baud Pocsag or 1600 baud FLEX. This is
essentially a VHF exciter with the T800-32-
0000 paging modulator built into it. It does
not have voice capability.
T837-20-1021 As above but with external frequency
reference.
In addition to the above, you can order directly from the factory
a T8xx-xx-1010 or T8xx-xx-1012 exciter or transmitter. These
come with the T800-32-000x kit already fitted, and all required
modifications done. These are suitable for UHF or 800/900
MHz paging requirements where we have not developed the
Paging only exciter.
Tait Electronics Ltd August 2002
T800 Paging Systems Page 3 of 3
2 High Stability Oscillator
For wide area paging solutions, you will require some form of
external frequency reference. The T801-20-0000 is a 10MHz
OCXO reference with .001ppm stability and manually adjustable
offsets up to 5ppm suitable for use with VHF wide area paging
networks.
It uses a single slot in a standard 5U T800 rack frame. The
T800-28-0000 is a rack frame specifically designed for paging
transmitters and includes slots for the T801-20-0000 reference,
a Paging exciter and Power Amplifier, a T8x5 link receiver and
a Power Supply.
Tait Electronics Ltd August 2002
T800 Paging Systems Page 4 of 4
3 Modem / Delay board
The T800-37-0000 is used for two reasons:
1. To add a digital delay to the paging signal. This is used to
compensate for the propagation delay for outlying paging
transmitters on a wide area paging network.
2. To decode the modem tones used on an analogue link
from the paging encoder to the remote paging transmitter.
The delay is adjustable from 0 – 5 msec in 3.35 µsec (1 km)
steps.
The asynchronous modem is compatible with V.23 or Bell 202
modem standards and either 512 or 1200 bps rates.
The T800-37-0000 fits inside of a T837-20-102x paging exciter.
Installation is as simple as connecting the supplied ribbon cable
to the paging exciter and selecting the required delay and data
polarity using solder links.
The T800-37-0000 is not fitted into the link transmitter; a
separate modem is needed to convert the paging encoder data
to V.23 or Bell 202 tones.
T800-35-0000
Tait Electronics Ltd August 2002
T800 Paging Systems Page 5 of 5
4 Typical Wide Area Paging options
Tait only manufactures equipment used between the paging
encoder and the paging receiver. We do not manufacture
encoders or receivers, as this is an already developed market
with many manufactures providing cheep and reliable products.
At the encoder end, you would need something like a Zetron
Model 15 Encoder, which has a RS232 output. For wide area
paging you need to connect this to a V.23 or Bell 202 modem
before connecting it to your UHF link transmitter. We can
supply a Slimline T800 for this purpose.
At the remote end, a T855 receiver is used to receive the signal
from the central transmitter. This is then decoded by the T800-
37-0000 modem board, which also adds the required amount of
delay to the signal. The T801-20-0000 is used to generate the
reference frequency, with the required offset. The T837-20-
1021 then takes all of this to make the paging signal, which is
fed to the PA and antenna equipment. And with any luck the
subscriber has their pager turned on and receives the message.
Paging
Terminal
Link TX
Modem
Paging
encoder
Link RX
Modem
Digital
Delay
Paging
Exciter
PA
HSO
Data entry

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