Tait T800 SL2 25W, Service Manual

Page: 157 / 383

M8SL2-00-002-812
T854 Initial Tuning and Adjustment C3.3
© Copyright Tait Electronics Limited August 2004. All rights reserved.
3.1 Introduction
When you receive your T854 transmitter it will be run up and working on a particular
frequency (the “default channel")
1
. If you want to switch to a frequency that is within
the 8MHz switching range (i.e. ±4MHz from the factory programmed frequency), you
should only need to reprogram the transmitter with the PGM800Win software (refer to
the PGM800Win programming kit and Section 3.2 below).
However, if you want to switch to a frequency outside the 8MHz switching range, you
will have to reprogram and re-tune the transmitter to ensure correct operation. In this
case you should carry out the short tuning procedure described in Section 3.4.
If you have carried out repairs or other major adjustments, you must carry out the full
tuning and adjustment procedure described in this section (except for Section 3.4).
3.2 Channel Programming
You can program up to 128 channel frequencies into the transmitter’s EEPROM memory
(IC820) by using the PGM800Win software package and a PC. You can also use
PGM800Win to select the transmitter’s current operating frequency (or “default chan-
nel").
If the transmitter is installed in a rack frame, you can program it via the programming
port in the speaker panel. However, you can also program the transmitter before it is
installed in a rack frame as follows:
• by using a T800-01-0010 calibration test unit;
• via D-range 1;
• via D-range 2 (standard T800-03-0000 auxiliary D-range only);
• via SK805 (internal Micromatch connector).
If you do not use the T800-01-0010, you will have to connect the PC to the transmitter
via a module programming interface (such as the T800-01-0004).
For a full description of the channel programming procedure, refer to the PGM800Win
programming software user’s manual.
Note: When an auxiliary D-range kit (D-range 2 – T800-03-0000) is fitted, you can
also select a channel with an external switch, such as the DIP switch on a
backplane PCB. Refer to your nearest Tait Dealer or Customer Service
Organisation for further details.
1. Use the “Read Module” function in PGM800Win to find out what the default channel
is.