Icom IC-7800 - Page 367

3 - 23
3-7-22 BUFFER IC (MAIN UNIT; IC251)
11 TXB7
Outputs the bandpass filter (B7)
selecting signal during transmit.
High : While transmitting on
11–15 MHz.
12 TXB6
Outputs the bandpass filter (B6)
selecting signal during transmit.
High : While transmitting on
8–11 MHz.
13 TXB5
Outputs the bandpass filter (B5)
selecting signal during transmit.
High : While transmitting on
6–8 MHz.
14 TXB4
Outputs the bandpass filter (B4)
selecting signal during transmit.
High : While transmitting on
4–6 MHz.
15 TXB3
Outputs the bandpass filter (B3)
selecting signal during transmit.
High : While transmitting on
3–4 MHz.
16 TXB2
Outputs the bandpass filter (B2)
selecting signal during transmit.
High : While transmitting on
2–3 MHz.
17 TXB1
Outputs the bandpass filter (B1)
selecting signal during transmit.
High : While transmitting on
1.6–2 MHz.
18 TXB0
Outputs the bandpass filter (B0)
selecting signal during transmit.
High : While transmitting on
0.03–1.6 MHz.
Pin Port
Description
number name
3-7-23 BUFFER IC (MAIN UNIT; IC261)
12 AMS
Outputs the transmit output power
control signal.
High : Transmitting in AM mode.
13 50MS
Outputs the transmit output power
control signal.
High : Transmitting in 50 MHz band.
14 HFS
Outputs the HF band transmitting
power control signal.
16 TXB10
Outputs the bandpass filter (B10)
selecting signal.
High : While transmitting on
30–60 MHz.
17 TXB9
Outputs the bandpass filter (B9)
selecting signal.
High : While transmitting on
22–30 MHz.
18 TXB8
Outputs the bandpass filter (B8)
selecting signal.
High : While transmitting on
15–22 MHz.
Pin Port
Description
number name
3-7-24 SERIAL/PARAMETER IC
(RXPLL-A UNIT; IC1)
4 PST2A
Outputs the strobe signals to the 1st
LO PLL IC on the RXPLL-A unit.
5 PST1A
Outputs the strobe signals to the 1st
LO DDS IC on the RXPLL-A unit.
6 PST3A
Outputs the strobe signals to the 2nd
LO DDS IC on the RXPLL-A unit.
7 PST4A
Outputs the strobe signals to the T3
LO DDS IC on the RXPLL-A unit.
Pin Port
Description
number name
3-7-25 SERIAL/PARAMETER IC
(RXPLL-B UNIT; IC1)
4 PST2B
Outputs the strobe signals to the 1st
LO PLL IC on the RXPLL-B unit.
5 PST1B
Outputs the strobe signals to the 1st
LO DDS IC on the RXPLL-B unit.
6 PST3B
Outputs the strobe signals to the 2nd
LO DDS IC on the RXPLL-B unit.
7 PST4B
Outputs the strobe signals to the T3
LO DDS IC on the RXPLL-B unit.
Pin Port
Description
number name
3-7-26 DDS IC (RXPLL-A UNIT; IC101)
67 MUTA
Outputs the 1st LO muting signal to
the RXPLL-A unit.
High : While muting.
68 VA6S
Outputs the 1st LO VCO (VCO6) con-
trol signal to the RXPLL-A unit.
High :
While receiving on 45–60 MHz.
70 VA5S
Outputs the 1st LO VCO (VCO5) con-
trol signal to the RXPLL-A unit.
High :
While receiving on 30–45 MHz.
71 VA4S
Outputs the 1st LO VCO (VCO4) con-
trol signal to the RXPLL-A unit.
High :
While receiving on 22–30 MHz.
73 VA3S
Outputs the 1st LO VCO (VCO3) con-
trol signal to the RXPLL-A unit.
High :
While receiving on 15–22 MHz.
74 VA2S
Outputs the 1st LO VCO (VCO2) con-
trol signal to the RXPLL-A unit.
High :
While receiving on 8–15 MHz.
75 VA1S
Outputs the 1st LO VCO (VCO1) con-
trol signal to the RXPLL-A unit.
High :
While receiving on 0.03–8 MHz.
Pin Port
Description
number name