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Sony U-Ceiver ICB-U655, Circuit Description

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Sony U-Ceiver ICB-U655 Circuit Description Download Page 3

FCC ID : AK8NTM30

Model : NTM-30

At the call

The call operation starts when PTT is pushed at the standby mode. The call signal
transmits automatically with an empty channel. The  signal which is modulated by
1kHz and the tone signal is transmitted for several seconds. The  1kHz  signal is
generated by the System Controller and the tone signal is generated by IC109. The tone
signal is CTCSS signal set beforehand. If there is no response for about ten seconds
after call signal is transmitted, the unit returns to the standby mode.

Summary of Contents for U-Ceiver ICB-U655

Page 1: ...rmediate Frequency IF 21 7MHz at a first mixer IC1 The first Local Oscillator is a Phase Locked Loop PLL synthesized oscillator being varactor tuned which is variable between 440 8625MHz to 446 0125MHz in RX mode The first mixer is a Double Balanced Mixer DBM The first IF signal is amplified at a IF amplifier Q2 and is converted to the second IF of 450kHz at a second Mixer in the IF IC IC2 The sec...

Page 2: ... picked up with the microphone MIC101 is amplified by Q118 and sent to IC106 Amplifies and pre emphasis LPF and Modulation limit amplifier are composed in IC106 The IC106 output is adjusted maximum frequency deviation with RV103 to becoming in the standard and is sent to varactor in VCO1 through LPF Finally modulated wave is transmitted through Antenna SEARCH SYSTEM At the standby The channel is s...

Page 3: ... channel The signal which is modulated by 1kHz and the tone signal is transmitted for several seconds The 1kHz signal is generated by the System Controller and the tone signal is generated by IC109 The tone signal is CTCSS signal set beforehand If there is no response for about ten seconds after call signal is transmitted the unit returns to the standby mode ...

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