Short Tuning Procedure; Introduction; Synthesiser Alignment; Front End Alignment - Tait T880 II Series Adjustment Manual

M880-00
3.4

Short Tuning Procedure

Use this procedure only if you want to reprogram the receiver to a frequency outside the
6MHz switching range and do not intend to carry out any other major adjustments or
repairs.
3.4.1

Introduction

Reprogram the operating frequency as described in the PGM800Win program-
ming kit (refer to
Remove the top cover (nearest the handle).
Set up the test equipment as described in
Set the links in the audio processor section as required (refer to
3.4.2

Synthesiser Alignment

• Connect a high impedance voltmeter to the via next to R520 in the VCO cavity
(this measures the synthesiser loop voltage).
• Single Channel
Multichannel
3.4.3

Front End Alignment

Note 1: In this and following sections deviation settings are given first for wide
bandwidth sets, followed by settings in brackets for narrow bandwidth sets
[ ].
Note 2: For multichannel operation align the receiver on a frequency in the middle
of the required band.
Set RV230 (front panel gating sensitivity) fully clockwise.
Copyright TEL
Section 3.2).
Tune VCO trimmer CV500 for a synthesiser loop voltage
of 10V.
Tune VCO trimmer CV500 for a synthesiser loop voltage
of 10V on the middle channel.
If there is no middle channel, tune CV500 so that the chan-
nels 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 program channels with a greater fre-
quency separation than the specified switching range of
6MHz.
T885 Initial Tuning & Adjustment
Section 3.3.
B3.5
Section 3.5).
10/07/00