Panasonic KX-F900 Service Manual page 176

I KX-F900
(3) Receiver RF Circuit ( ): Portable Handset
The electric wave received from the antenna ia attenuated by the SAW filter F302 (F402) except the received fre-
quency band Then it is amplifier Q304 (Q404) and Q303 (Q403), and supplied to the IC301 (IC401) pin 23
(MIXER input).
Circuit Diagram
R312
IC301 04 ANT
(_327
"
MIXER IN _ _ : o _ I
C390
Y
(4) MIXER IF Circuit ( ): Portable Handset
The reception frequency band signal supplied to the pin 23 MIXER input of IC301 (IC401) is converted into a 10.7
MHz first IF signal by the mixer circuit, using the reception local signal. The result is then output to pin 13 MIXO.
The resonator circuit consisting of L304, C336 (L404, C436) resonates at 10.7 MHz. The 10.7 MHz IF signal is fil-
tered by ceramic filter F303 (F403) and then supplied to IF amplifier Q305 (Q405).
Circuit Diagram
4<.-.--
IC301
__ Buffer_ RX Signal
I ot M,xE.% .,x,.
C338
-41_ - _ _ . '_MIXEROUT
-I- R320 1st IF
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