GENERAL DESCRIPTION
Your SOMMERKAMP TS-712P transceiver has been designed for continous heavy
duty base station application. It сап be operated with a microphone and internai
speaker or headset, speaker/microphone combination, teiephoneset incorporating
automatic voice operated transm it/receive switching, external sélective calling
with automatic answerback and many more.
GENERAL:
The transceiver is desïgned to operate from 110/220 Volt AC as a base station.
Its straight forward 12 channel capability allows it to operate on any combination
of frequencies within 26.5 and 29.7 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 27 MHz (11 meter) citizens band. The unique combination of low noise
Field E ffect Transistors (FET), single conversion, a combination of mechanical
ceramic, and L/C filte rs , fui ly automatic noise lim ite r and a hi fi quality speaker
am plifier w ill 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 m ilita ry communication equipment.
The power supply of the receiver RF. IF and oscillator section is stabilized by an
extreme Sharp c u t-o ff Zener diode to obtain the high sensitivity and unwanted
signal rejection. The fui ly automatic sériés gâte noise lim iter, which virtually
cuts o ff 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 am plifier w ill 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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