Communication Concepts AN758 - Manual (Page 8)

AR
C
HIVE INF
O
RMA
TI
O
N
PRODUCT TRANSFERRED T
O
M/A
–
COM
AN758
8 RF Application Reports
Optional
Input
Atten-
uator
Q1 Q2
R4
R2
R3
R1
L4 L3
T3
C7
C6
C8
C C
T2
E E E E
B
C11 C13
Q3
L2 L1
T1
R5
C12
R6
R10
R9
R8
R12 D2
R7
MC1723C
D1
C1 C2
C3
A. B.
Terminal Pins and
Feedthroughs
Feedthrough Eyelets.
Stand Off’s
Figure 9. Component Layout of the 300 W Amplifier Module
PARTS LIST*
(Power Module and Driver Amplifier)
Power Module Driver Amplifier
C1, C2 5600 pF 3300 pF
C3 56 pF 39 pF
C4 470 pF Not Used
C5 560 pF 470 pF
C6 75 pF 51 pF
C7, C8 0.1 µF 0.1 µF
C9, C10 0.33 µF 0.33 µF
C11 10 µF/150 V 10 µF/150 V
R1, R2 2 x 3.9 Ω / 1/2 W in parallel 2 x 7.5 Ω / 1/2 W in parallel
R3, R4 2 x 6.8 Ω / 1/2 W in parallel 2 x 18 Ω / 1/2 W in parallel
L1, L2 Ferroxcube VK200 19/4B ferrite choke Ferroxcube VK200 19/4B ferrite choke
L3, L4 6 ferrite beads each, Ferroxcube 56 590 65/3B 6 ferrite beads each, Ferroxcube 56 590 65/3B
All capacitors, except C11, are ceramic chips. Values over 100 pF are Union Carbide type 1225 or 1813 or Varadyne
size 18 or 14. Others ATC Type B.
T1 9:1 type, see text. 4:1 type, see text.
(Ferrite core for both: Stackpole 57-1845-24B or Fair-Rite Products 287300201 or equivalent.)
T2 7 turns of bifilar or loosely twisted wires. (AWG #20.)
Ferrite cores for both: Stackpole 5-9322, Indiana General F627-8Q1 or equivalent.
T3 14 turns of Microdot 260-4118-00 25 Ω miniature coaxial
cable wound on each toroid. (Stackpole 57-9074, Indiana
General F624-19Q1 or equivalent.)
11 turns of RG-196, 50 Ω miniature coaxial cable wound
on a bobbin of a Ferroxcube 2616P-A100-4C4 pot core.
* Parts and kits for this amplifier are available from Communication Concepts Inc., 508 Millstone Drive, Beavercreek, Ohio 45434–5840
(513) 426-8600.