Rf/If Unit; Main Unit; Pll Unit - Icom IC-R7000 Instruction Manual

8-3 RF/IF UNITS
BPF, RF Amp Circuits-----'
20dB Attenuator C i r c u i t - - - - - - - -
R F
Unit-----------4~:\i
IC2 (T.A7303P F M w - - - - - - - - - :
Detector, Limiter Circuits)
IC5 (}.IPC577H FMn - - - - - - - - - - ,
Limiter Amp)
IF Unit _ _ _ _ _ _ _ _ _ _ _ _ _ . ,
BFO C i r c u i t - - - - - - - - - - - -
~~---_:_--1st
LO Amp, Mixer Circuit
~~~---------1st IF Amp
' - - - - - - - - - 2 5 - 512MHz IF Filter
, - - - - - - - - - - 512 - 1 OOOMHz IF Filter
- - - - - - 2 n d LO Amp, Mixer Circuit
- - - - - - - - - - - 2 n d RF Amp
- - - - - - - 1 Q . 7 M H z Crystal Filter
- - - - - - - - N o i s e Blanker Circuit
- - - - - - - - 4 5 5 k H z 3rd IF Filter
~-----3rd
LO Amp, Mixer Circuits
~-------
J8 (AM Filter Selector
Connector)
*The connector is pre-set for
WIDE IF
passband position at factory.
J8
0
NAR
~~I
WIDE
8-4
MAIN UNIT
. - - - - - - - - - - - - IC2 (NJM4558D FM Center Meter
VSC Control Circuitl
IC8 (}.IPC1241H AF A m p ! - - - - - - - - - - - - - - - '
8-5 PLL UNIT
IC3 (M54929 Programmable D i v i d e r ! - - - - - - - - - - - - - .
IC7 (HD10551 1/10 Di
X2 (51.2MHz Crystal for
PLL Reference Osc)
-33-
IC5 (NJM4558D Signal Center
frequency Detector Circuit)
IC1 (NJM4558D VSC Amp)
IC7 (Noise Squelch Control
Circuit)
Relay for Recording Remote
Function
' - - - - - - - - - - I C 6 (NJM7809A Voltage Regulator)
Unit
Doubler for 1st LO Output
- - - I C 4 (M54466L 1/10, 1/11
Pre-scaler)
- - - - X 1 (12MHz Crystal for
D/A Converter)
' - - - - - - - - - - - - - M i x e r Circuit