Page 1
J1
DC Power
Comtech
FM1394RTIM Tuner
1340 MHz - 1450 MHz
1240 MHz - 1367.5 MHz
with G1MFG PIC
(1) Rx Signal Level
R25 1K
(2) AFT OUT2
+5 VOLTS
AFT OUT1
(1) P3
18
RA1
17
RA0
4
MCLR
3
RA4
5
Gnd
16
OSC1
OSC2
15
(2) If Modified
See Tuner Schematic
(1) If Modified
See "S" Meter Mod
R26 100K
R27 120K
LNB
BB
P4
TU
P5
SDA
SCL
16F84A
PIC
C26
10/25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R28
10K
1
RA2
2
RA3
14
+5
6
RB0
7
RB1
8
RB2
9
RB3
10
RB4
11
RB5
12
RB6
13
RB7
R1
10K
R29
10K
C1
220/16
22/16
C29
0.1
C27
0.1
7805
7809
C30
0.1
* If Gold Receiver -
C28
1000/10
C31
220/25
Platinum Receiver Component Values
Make
Make
Make
Add
Confirm
Make
Confirm
Confirm
Make
Make
Basic Receiver Original Component Values
C2
2.2u
/50
Remove 470 pfd
added across R3
22/16
R30-R37
10K
R2 2K
180p
23cm FM ATV Platinum Receiver
Comtech RTIM-00 Drawing by VE6SBS - www.sbszoo.com Oct 09 / 2003
C11
56p
C10 - 20p
C2 = 22 ufd / 6.3V minimum
C3 = 180p
C4 = 22 ufd / 6.3V minimum
C5 = 150 pfd
C6 = 390 pfd
C7 = 390 pfd
C8 = 0.05 ufd
R8 = 150 ohms
C10 = 20 pfd
C1 = 220 ufd / 16 V minimum -
(if an un-regulated wall-wart will be used.)
470p
C3
1
2
3
4
5
6
7
8
220p
L3
6.8uH
R4
4.7K
8
R5
R6
4.7K
4.7K
R3
680
0.22
22/16
1
C4
9.0 VDC
R13
68K
9.0 VDC
6
NE592D
3
R14
390
C12
.001
2SC
3793
7
2
VR1 - 2K
R8 75
C13
.001
* If Gold Receiver Remove 75 ohm resistor or
150 ohm resistor across R8.
Ensure R8 = 150 ohms.
R21
5
0
R8 - 150
4
C1
100/6.3
X
CCIR 405-1
De-emphasis
Network
(Untested)
F1
R15
470
6.0M
F2
R18
470
6.5M
X
6.8uHL26.8uH
None
C5 - 150p C7 - 390pC6 - 390p
R1 75
KIA6003S
In
Bypass
Level
Mute
Gnd
Detect
1 2 3 4 5 6 7 8 9
R16
10K
C14
.01
Detect
R17 - 10K
C15 56p
T1 - 14uH
KIA6003S
In
Bypass
Level
Mute
Gnd
Detect
C8 - 0.05
BC547
R20 - 15K
C21 43p
T2 - 14uH
R9
390K
C3
100/6.3
Detect
+9
R6
470
R7
47K
1 2 3 4 5 6 7 8 9
R19
10K
C20
.01
* If Gold Receiver -
X
Remove 0.1 ufd
R4 75
C2
5424 p
(2200 + 3300)
(2700 + 2700)
added across C8
680p
R5
75
L1
390p
L1 33 µh
R2 300
R3
18
AF Out
C16
10p
AF Out
C22
10p
R11
47K
R10
47K
Vcc
Vcc
* AF Output for 22.5 kHz dev =
(B) 90 - 150 mVrms
(C) 130 - 210 mVrms
C17
* AF Output for 75 kHz dev =
.22
500 mV ( 1.2 Vp-p)
* Output Impedence = 1.3K
C19
.1
C18
.01
* C18 - .01 ufd is for de-emphasis
* Pin 1 - Input Limiting Voltage =
316 uV ( 895 uVp-p )
562 uV ( 160 mVp-p ) max
* Pin 3 - Meter Voltage =
4 Vmax @ 316 mV ( 895 mVp-p )
* Pin 4 - Gnd to mute channel
C23
.22
C25
.1
C24
.01
2SC
2412
2SD
1383K
R22 0
R12
150
C9
22/16
X
CCIR emphasis & de-emphasis
circuit evaluation to follow
when time permits.
White
Red
C10
470/16
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