Read Panasonic KX-TG2560B / KX-TG2560S Service Manual online
49
KX-TG2560B/KX-TG2560S
TXVCO
1200MHz
1200MHz
PN code
IC920
IC920
2.4GHz
SS signal
SS signal
18
NEW CIRCUIT OPERATION (Base Unit-RF)
1. TX Doubler / Spreader
2. Driver Amplifier / Power Amplifier
The signal of 1200MHz is input from pin 42
of IC750. At first, TX Doubler (internal) makes this signal to 2400 MHz, then this
signal goes to Spreader (internal).
PN code* from pin 18
PN code* from pin 18
of IC920 is input to pin 37
of IC750, causing the input signal coming from TX Doubler (internal).
The spread signal is output from pin 33
of IC750.
The spread signal output from pin 33
of IC750 is input to pin 4
of Driver Amp. Q720 through FL750 (2400 MHz BPF). Q720
increases the level approximately 15dB, then it is output from pin 2 . This signal is input from pin 5 of IC701 (Power Amp.).
IC701 increases the level approximately 25 dB, then it radiated from TX ANT.
PN code* (Pseud Noise):
A digital data that is multiplied to
extend a spectrum for a signal
modulated by base band signal
(FM).
A digital data that is multiplied to
extend a spectrum for a signal
modulated by base band signal
(FM).
Circuit Diagram
Circuit Diagram
Click on the first or last page to see other KX-TG2560B / KX-TG2560S service manuals if exist.