4-12. PC-200C Second I.F. Amplifier, Second Mixer, Mic. Amp.,
S-Meter Amp.
In receive mode, the I.F. signal from the 8 pole Crystal Ladder Filter is coupled through terminal 3 of PC-200C to the
Integrated Circuit Q201, which is the Second I.F. Amplifier. The signal is amplified and coupled through the tuned
circuit that consists of R203, C205 and L201, which is tuned to the I.F. frequency of 5520 kHz; through R204 to the
Trifilar Toroid Transformer L202, to the input of the double balanced diode ring Second Mixer Stage consisting of
D201 through D204. In the receive mode, this mixer acts as a product detector by hetrodyning the carrier oscillator
injection and I.F. input to the audio output frequency. The audio output is coupled through C206 and the Trifilar Toriod
Transformer L203, through the RF choke L204 to terminal 5 of PC-200C. From terminal 5, the audio signal is coupled
direct to terminal 20 of PC-300C.
In transmit mode, the double sideband signal from PC-100C is passed through the Crystal Ladder Filter which removes
the unwanted sideband. The resultant single sideband signal is coupled through terminal 3 of PC-200C to the Second
Mixer in the same manner as in the receive mode. The VFO injection frequency is through terminal 7 of PC-200C
through C208 to the center tap of the Trifilar Toroid Transformer L203. The heterodyning action of the Second Mixer
produces the RF transmit frequency which is coupled through the primary winding of L203 to terminal 9 of PC-200C.
Q202, which is an integrated Circuit, acts as a 3 stage Mic. Amplifier and also the S-Metcr Amplifier.
PC 200C CIRCUIT COMPONENTS
Second I.F. Amp., Second Mixer, Mic Amp. S-Meter Amp.
C201,202,203,206,
Q201 ..................... MC1350PI.C.
207,208,211. ....... .01 MF l00VDisc
Q202 ...................... CA3086I.C.
C204 ................... 100 MF 20VDisc
R201 ................... 180 10% '/4 Watt
C205. .................... 130pF5% SM
R202.210. .............. 2.2K 10% 1/4Watt
C209.220. ............... 0.1 MF 50V Disc
R203 .................. 3.9K 10% '/4 Watt
C210. ............. 6.8 MF 35V Electrolytic
R204.205. ................ 47 10% 1/4 Watt
C212,218 .......... 2.2 MF 50V Electrolytic
R206.213,221 ............ 470 10% '/4 Watt
C213,215,219 .............. .001 20% Disc
R207,212. .............. 5.6K 10% '/4 Watt
C214.............. 15 MF 25V Electrolytic
R208 .................... 68 10% 1/4 Watt
C216.217. .......... 22 MF 16V Electrolytic
R209.217 ................ 1K 10% '/4Watt
C221. ............... .0022 MF 10% Mylar
R211 ................... 27K 10% '/4 Watt
D201,202,203,
R214. ................. 150K 10% 1/4 Watt
204,206,207. .... 1 N4148 Silicon Diode
R215 .................. 100K 10% '/4 Watt
D205............. 1N4740 10V Zener Diode
R216.219 ............... 10K 10% 1/4 Watt
L201 ................. Shielded I.F. XFMR
R218. .................. 39K 10% 1/4 Watt
L202,203 ............ Trifilar Toroid XFMR
R220 ................... 100 10% 1/4 Watt
L204....................... 200 uH RFC
R222. ............... 1K S-Meter Trim Pot.
L205 .................... 0.6 uH I.F. Trap
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Страница 26: ...Figure 4 3 Crystal Ladder Filter Selectivity Characteristics 23 ...
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Страница 57: ...ATLAS RADIO INC 417 Via Del Monte Oceanside California 92054 714 433 1983 ...
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