Section 4C: IF Amplifier and AGC
4-50. Install
U8, a MC1350P 8-pin DIP IC,
being
the notched or dotted end as outlined on the board.
4-51. Install
U9, a MC1350P 8-pin DIP IC,
being
the notched or dotted end as outlined on the board.
4-52. Install transistor
Q9, NPN type 2N4124.
4-53. Install transistor
Q11, NPN type 2N4124.
4-54. Install transistor
Q10, PNP type 2N5087.
4-55. Install diode
D12, type 1N4148,
with correct cathode
band orientation as outlined on the board.
4-56. Install the
455 kHz filter FL2 (labeled CFR455-I).
Its pin
arrangement permits only one possible orientation. Simply ignore
the group of small circuit board holes covered by the filter case.
4-57. Install
T2, a 455 kHz shielded transformer.
Its pin
arrangement permits only one possible orientation. (While the
markings may vary, these transformers have 5 pins, 2 shield tabs
and are the only parts in the kit which will fit here.)
4-58. Install
T3, a 455 kHz shielded transformer,
per the
information in the preceding step.
Install the following 1/4-watt resistors:
4-59. Resistor
R66, "0 ohm"
(one black band).
4-60. Resistor
R42, 100 ohms
(brown-black-brown).
4-61 . Resistor
R43, also 100 ohms.
4-62. Resistor
R62, 1K
(brown-black-red).
4-63. Resistor
R67, also 1K.
4-64. Resistor
R47, 2.2K
(red-red-red).
4-65. Resistor
R61, also 2.2K.
4-66. Resistor
R52, 4.7K
(yellow-violet-red).
4-67. Resistor
R65, also 4.7K.
4-68. Resistor
R50, 10K
(brown-black-orange).
4-69. Resistor
R51, also 10K.
4-70. Resistor
R59, also 10K.
4-71 . Resistor
R64, also 10K.
4-72. Resistor
R63 , 22K
(red-red-orange).
4-73. Resistor
R49, 220K
(red-red-yellow).
4-74. Resistor
R48, 1 megohm
(brown-black-green).
1254
±
Assembly - 44
Содержание SSB-CW-AM
Страница 25: ...1254 Assembly 4...
Страница 34: ...Phase 2 0 Assembly begins on page 14 1254 Assembly 13 This space is for your notes...
Страница 35: ...1254 Assembly 14 Phase 2 0 Schematic Diagram Details...
Страница 46: ...This space is for your notes Phase 3 0 Assembly begins on page 26 1254 Assembly 25...
Страница 47: ...1254 Assembly 26 Phase 3 0 Schematic Details...
Страница 57: ...1254 Assembly 36 Phase 4 0 Schematic Details...
Страница 68: ...1254 Assembly 47 This space is for your notes...
Страница 69: ...Phase 5 0 Schematic Details 1254 Assembly 48...
Страница 77: ...Phase 6 0 Schematic Details 1254 Assembly 56...
Страница 93: ...1254 Assembly 72 This space is for your notes...
Страница 101: ...Figure 3R Model 1254 Block Diagram 1254 Reference 8...