Copyright TEL
31/01/96
1.1
Introduction
The T835 is a high performance FM base station receiver designed for single or mul-
tichannel operation in the 136 to 174MHz frequency range.
The receiver is a dual conversion superhet with a synthesised local oscillator. The first
IF is 21.4MHz, allowing exceptionally high spurious signal rejection to be achieved in
the receiver front end. The second IF section (455kHz) combines amplitude limiting,
detection and RSSI within a single integrated circuit. It also drives a noise level detector
for gating the audio output. RSSI is also used to drive a carrier mute for audio output
gating.
The audio section output can be adjusted to deliver >+10dBm to a 600 ohm balanced
output, and 1W to a local monitor speaker. A flat or de-emphasised audio response is
link selectable.
The synthesiser frequency is programmed via an EPROM which is attached to a sepa-
rate plug-in memory board. A DIP switch on the memory PCB allows fast single chan-
nel selection from a multichannel programmed EPROM, but for true multichannel
capability the EPROM must be addressed separately via an additional D-range plug at
the rear of the set.
All components except those on the VCO and memory boards are mounted on a single
PCB. This is secured to a die-cast chassis which is divided into compartments to indi-
vidually shield each section of circuitry. Access to both sides of the main PCB is
obtained by removing each of the two chassis lids. There is provision within the chassis
to mount small option PCBs.
The front panel controls include gate sensitivity, line level, monitor volume and a mute
disable switch. This switch disables the mute (squelch) signal to the monitor amplifier
as an aid to servicing.
Summary of Contents for T830 Series
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