8
FTM-10R/E Technical Supplement
Circuit Description
stage power amplifier's gain is controlled by the APC cir-
cuit.
The 40-Watts RF signal passes through the high-pass fil-
ter and low-pass filter networks, antenna switch D1014
(
L709CER
), another low-pass filter network, and then is
delivered to the ANT jack.
Transmit APC Circuit
A portion of the Power amplifier output is rectified by
D1009 and D1010 (UHF: D1037 and D1038) (both
M A 2 S 7 2 8 0 0 L
) , t h e n d e l i v e r e d t o A P C Q 1 3 1 7
(
LM2904PWR
), as a DC voltage which is proportional to
the output level of the power amplifier.
The APC Q1317 (
LM2904PWR
) is the rectified DC volt-
age from the power amplifier and the reference voltage
from the main CPU Q1813 (
HD64F2266TF13
), to produce
a control voltage, which regulates the supply voltage to
the Pre-Drive amplifier Q1003 (
2SK2596BXTL
), Drive
amplifier Q1002 (
RD07MVS1-T12
) and Power amplifier
Q1001 (
RD70HVF1
), so as to maintain stable output power
under varying antenna loading condition.
PLL
A portion of the output from the VCO Q1309 (
2SC5006-
T1
), or Q1313 (
2SC5006-T1
) passes through the program-
m a b l e d i v i d e r s e c t i o n o f t h e P L L I C Q 1 3 0 4
(
MB15A02PFV1-G-BND-EFE1
), which divides it accord-
ing to the frequency data that is input from the main CPU
Q1813 (
HD64F2266TF13
). It is then sent to the phase com-
parator.
The 11.7 MHz frequency of the reference oscillator circuit
made up of X1301 is divided by the reference frequency
divider section of Q1304 (
MB15A02PFV1-G-BND-EFE1
)
into 4250 or 3400 parts to become the 5 kHz or 6.25 kHz
comparative reference frequencies, which are utilized by
the phase comparator.
The phase comparator section of Q1304 (
MB15A02PFV1-
G-BND-EFE1
) compares the phase between the frequen-
cy-divided oscillation frequency of the VCO circuit, and
the comparative frequency. The output is a pulse corre-
sponding to the phase difference. This pulse is integrated
by the charge pump and loop filter of Q1304
(
MB15A02PFV1-G-BND-EFE1
) into a control voltage
(VCV) to control the oscillation frequency of the VCOs.
Summary of Contents for FTM-10R
Page 4: ...Exploded View Miscellaneous Parts 4 FTM 10R E Technical Supplement Note...
Page 5: ...5 Block Diagram FTM 10R E Technical Supplement...
Page 6: ...6 Block Diagram FTM 10R E Technical Supplement Note...
Page 50: ...50 Parts List MAIN Unit FTM 10R E Technical Supplement Note...
Page 60: ...60 PANEL Unit FTM 10R E Technical Supplement Note...
Page 62: ...62 Side A Side B CONNECTOR Unit Lot 1 15 Circuit Diagram Parts Layout...
