GENERAL DESCRIPTION
Your SOMMERKAMP TS-727GT transceiver has been designed for continous heavy
duty mobile and base station application. It can be operated with a microphone
and internai speaker or headset, speaker/ microphone combination, telephoneset
incorporating automatic voice operated transmit/receive switching, external sélective
calling with automatic answerback and many more.
GENERAL:
The transceiver is designed to operate from 12 Volt DC powersupply as a
mobile station. Its straight forward 6 channel capability allows it to operate
on any combination of frequencies within 26.5 and 2 .7 MHz by inserting the
corresponding Xtals and retuning the transceiver if required. The Xtals in the
transceiver are standard 27 MHz CB Xtals with plus or minus 455 KHz receiver
offset. No special synthesiser or IF Xtals are required.
RECEIVER SECTION
The receiver section is designed to receive amplitude modulated (AM/A3) signais
in the 26. 65 to 27.275 MHz. (11 meter) citizens band. The unique combination
of low noise Field Effect Transistors (FET), single conversion, a combination
of mechanical ceramic, and L/C filters, fuily automatic noise limiter and a hifi
quality speaker amplifier will give you exceptional réception quality in this
fine piece of equipment.
In addition, the above combination of the latest technology provides you with
a sensitivity and unwanted signal rejection and noise suppression available
previously only in space and military communication equipment.
The power supply of the receiver RF. IF and oscillator section is stabilized by an
extreme Sharp cut-off Zener diode to obtain the high sensitivity and unwanted signai
rejection. The fuily automatic sériés gâte noise limiter, which virtually cuts off
the audio output during ignition noise puises, is defeatable to make even the
weakest signal audible which otherwise would be eut off by the threshold level of
the ANL switching diode.
The high squelch sensitivity is achieved by using a seperate squelch detector and
switching circuit with a carefully balanced hystérésis. The transformerless hifi
quality audio power amplifier will drive any load between 8 ohms and indefininite
such as internai speaker or external speaker/microphone or headset combinations
having the above impédances.
The meter indicates the field strength during réception of a signal.
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