Heathkit AFM 1 Schematic

Page 2

. Ii

One other distinctive feature of the IF strip is its sthched bandwidth. The AM section of IFTI and IFTZ have tar
tiary windings which han be switched as desired, When they are switched in they increase the IF bandwidth thm
enabling the tuner to take full advantage of good quality local station broadcasts,

The tuning indicator is made inuperative on the WIDE bandwidth position, since the increased bandwidth could caule
incorrecltuning. It is therefore recommendod that the correct tuning point is found on the NARROW position before

switching t0 WIDE.

AM. AUDIO RESPONSE.

o - ~. \ \\
AM \ N AM
NARROW \ \ BROAD
\
1 -lo \
H! . \
W
I , .1
. |.I.l
2 ~20
o \
J |
a V
l
7, ~30
J.
21: k» " .
it
lo we Iooo IOOOG
FREQU ENCY IN CYCLES PER SECOND.
RESISTOR AND CAPACITOR IDENTIFICATION CHART (see Circuit Diagram)
R! 1 M9 R18 - R35 470 KIZ C4 20 pF C21 .01 pF C34 200 pl
R2 10 K9 R19 2200 R36 6. 8 K9 C5 20 pF C22 2000 pF C35 200 155
R3 10m R20 100 Kn R37 6.8 K52 C6 3.2pF C23 .01 pF C36 10 pF
R4 100 KS? R21 220KB R38 470 K9 ' C7 68 pF C24 .01.LF C37 .1 pF
R5 1.2 KS2 R22 1M9 R39 1 M52 C8 10 pF C25 100 131 C38 .1 .1?
R6 220 Kn R23 1.2 KS2 R40 1 Mn C9 15 pF C26 2000 pF C39 .5 F
R7 10 K4? R24 68 K9 R41 1 Kn C10 175 1317 C27 .02 PF C40 .1 F
R8 3052 R25 2209 R42 10 K9 C11 500 pF C28 . 01 F C41 .02 [LP
R9 47 KS? R26 2209 R43 1 M9 C12 .01 HF C29 100 pF C42 .1 51.?
R10 1509 R27 150 KB R44 1 M52 C13 .01 pl C30 100 pF C43 20 91
R11.~ 270 KS] R28 270 K9 R45 1M9 C14 .01 pF C31 27 pl" C44 20 pF*
R12 1K9 R29 100 K52 R46 4700 C15 .01 F C32 200 pF C45 20 pl?"
R13 820 K12 R30 1 M9 R47 4700 C16 100 pF C33 300 pl 1 1n same can
R14 33 K9 R31 689 C17 20 1
R15 68 KS2 R32 100 K9 C1 36 1.)]? C18 300 pF
R16 1.2m R33 470 KS1 C2 1000 p C19 100 pF
R17 47 K0 R34 1M0 C3 1000 p17 C20 .01 pF VCl/VCZ 528 + 528 pF

,GrLO'lICESYER -.-__.

DAY