Rev: November 20 2006
20
Group 7 Transmitter
[ ] R32 10K
E-5
[ ] R31 100K
E-5
[ ] C45 0,010uF
E-5
[ ] R30 3,3K upright
E-5
[ ] C46 47nF (473)
E-5
[ ] C50 10nF (103)
E-4/5
[ ] R39 27R upright
E/F-5
[ ] C94=820pF at PCB solder side
parallel to R39 (MODification)
[ ] Dr9 47
u
H SMCC
E/F-5
[ ] C52 10nF (103)
F-4/5
[ ] R37 47K upright
E/F-4
[ ] R38 330R upright
F-4
[ ] R42 680R upright
F-4
[ ] C51 47nF (473)
F-4
[ ] C53 47nF (473)
F-4
[ ] R40 10K upright
F-4/5
[ ] C55 470nF Foil spc 5 G-4
[ ] D14 1N4148
G-4
[ ] R45 47R upright
G-4
[ ] Dr8 47
u
H SMCC
H-4
[ ] C60 100nF (104)
H-4
[ ] C59 1
u
F Foil space 5 H-3
[ ] C58 10
u
F 35V rad.
H-3
[ ] R41 3,9K upright
F-5
[ ] R43 180R upright
F-4/5
[ ] R4410R F-4
Attention: ESD rules !!
[ ] T12 BF199
E/F-4/5
[ ] T13 BF199
F-4/5
[ ] T9 BC546B
E-4/5
[ ] T10 BS250
E-5
The driver Transistor must be mounted
on the little plastic socket you find in
the kit.
[ ] T14 plastic socket F-4
[ ] C57 47nF (473) F-3/4
The choke for the TX will be wound on a ferrite
because the TX current would be too high for a
standard SMCC choke.
We use an FT37-43 ferrite for the Choke. Again
take care to meet the geometrical
requirements, remember to count the turns
inside the ring.
[ ] Dr7 Amidon FT37-43 10turns 0,5mm
laquered wire
F-3
Prepare Dr7 by using the „blob „ method as
you did it in the LPF section.
[ ] C54 47nF (473)
G-4
[ ] C56 47nF (473)
G-4
Now a new thing, a transformer wound on a double hole core, a so called
PigNose. Because this is new and bacause I know that often mistakes where
made with pignoses, I will give a detailed description how to do. It is easy,
but you must know some facts.
The transforme is used to transform the high output impedance of the
drivers collector to the low input impedance of the PA Base. So we need a
step down transformer. Because it must work between 3,5 and 18 MHz, it
must be a broadband transformer. Such broadband transformers usually are
wound on Ferrite materials which give us high
inductivity with minimum number of turns which
results in low capacity between the turns.
Lay the pignose flat in the table, the holes looking
left to right as you see in the drawing right.
See how a complete turn in a pignose is formed:
Upper left to upper right
and back
Содержание Blue Cool Radio
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