Tait T850 II Series User Manual

C4.4 T856/857 Functional Testing M850-00
31/09/98 Copyright TEL
Figure 4.1 T856/857 Transmit Timers
4.5 Frequency Response
If the T856/857 has been correctly adjusted, the pre-emphasis and limiting responses
should closely match those shown in Figure 4.2 and Figure 4.3 respectively.
Note:
The limits shown on these graphs should not be exceeded.
• Measure the pre-emphasis response as follows:
Reduce the line level to give ±1kHz (±0.8kHz) [±0.5kHz] deviation at 1kHz.
Sweep the modulation frequency.
The response should closely match that shown in Figure 4.2.
• Measure the limiting response as follows:
Set the line level to give ±3kHz (±2.4kHz) [±1.5kHz] deviation at 1kHz.
Increase the line level 20dB and sweep the modulation frequency.
The response should closely match that shown in Figure 4.3.
Timer Function Adjustment
Transmit Tail Sets the tail time during which the
transmitter stays keyed after the exter-
nal key source has been removed.
0-5 seconds in 100ms
steps
Transmit Timeout Sets the maximum continuous trans-
mission time. Once the timer has
timed out, the transmitter must be
keyed again, unless prevented by the
transmit lockout timer.
0-300 seconds in 10
second steps
Transmit Lockout Sets the period of time that must
elapse after a timeout before the trans-
mitter can re-transmit. Once the timer
has timed out, the transmitter can be
keyed again.
0-60 seconds in 10
second steps
On
Lockout Time
Timeout
Time
On
Tail Time
Tx-Enable
Tx-Reg.
Tx-Enable
Tx-Reg.

Tait T850 II Series Specifications

General

Brand	Tait
Model	T850 II Series
Category	Accessories
Language	English