Heathkit SB-401 - Page 58

Ges e4rexit]
V5
6EW6
HET. MIXER
FROM
BANDPASS
COUPLER
FROM
HET.
OSC. R207 |C2// R208 |C2/2 R209
220K
TO KEYED BIAS
B+
GRN
are passed to ground, In this instance, the dif-
ference between the sideband frequency of 8,5
megahertz and the heterodyne oscillator fre-
quency of 12,395 megahertz results in a heter-
odyne mixer output frequency of 3,895 mega-
hertz,
680 33K
i‘ PF |
DRIVER GRID COILS
Page 133
C302
To
100 PF DRIVER
C2/3 CIB \AC4A {C30/ CIO3
.Ol 22PF 3-12
/ ‘ PF
/ / 8.6MHZ
/ / TRAP
= f= OS = alee
L. — L — — — = ee ————
= Figure 6-11
The output signal from tube V5 is coupled to
drive V9 through capacitor C302, Any RF energy
that may be fed through the bandpass filter at
approximately 8,6 megahertz present at the plate
of V5, is passed to ground by a trap, consisting
of RFC2 and capacitor C303,