Communication Concepts AN762 Application Note - Manual (Page 5)

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AN762
5 RF Application Reports
Table 1. Parts List*
100 W Amplifier 140 W Amplifier 180 W Amplifier
C1 51 pF 51 pF 82 pF
C2, C3 5600 pF 5600 pF 6800 pF
C4 — 390 pF 1000 pF
C5 680 pF 680 pF 680 pF
C6 1620 pF (2 x 470 pF chips + 680 pF
dipped mica in parallel) 1760 pF (2 x 470 pF chips + 820 pF
dipped mica in parallel) 1940 pF (2 x 470 pF chips + 1000 pF
dipped mica in parallel)
C8, C9 0.68 µF 0.68 µF 0.68 µF
C10 100 µF/20 V electrolytic 100 µF/20 V electrolytic 100 µF/20 V electrolytic
C11 500 µF/30 V electrolytic 500 µF/3 V electrolytic 500 µF/30 V electrolytic
C12 1000 pF disc ceramic 1000 pF disc ceramic 1000 pF disc ceramic
R1, R2 2 x 3.9 Ω / 1/2 W in parallel 2 x 3.6 Ω / 1/2 W in parallel 2 x 3.3 Ω / 1/2 W in parallel
R3, R4 2 x 4.7 Ω / 1/2 W in parallel 2 x 5.6 Ω / 1/2 W in parallel 2 x 3.9 Ω / 1/2 W in parallel
R5 1.0 Ω / 1/2 W 0.5 Ω / 1/2 W 0.5 Ω / 1/2 W
R6 1.0 k Ω / 1/2 W 1.0 k Ω / 1/2 W 1.0 k Ω / 1/2 W
R7 18 k Ω / 1/2 W 18 k Ω / 1/2 W 18 k Ω / 1/2 W
R8 8.2 k Ω / 1/2 W 8.2 k Ω / 1/2 W 8.2 k Ω / 1/2 W
R9 1.0 k Ω trimpot 1.0 k Ω trimpot 1.0 k Ω trimpot
R10 150 Ω / 1/2 W 150 Ω / 1/2 W 150 Ω / 1/2 W
R11 1.0 k Ω / 1/2 W 1.0 k Ω / 1/2 W 1.0 k Ω / 1/2 W
R12 20 Ω / 5 W 20 Ω / 5 W 20 Ω / 5 W
L1, L2 Ferroxcube VK200 19/4B ferrite choke
L3, L4 Two Fair-Rite Products ferrite beads 2673021801 or equivalent on AWG #16 wire each
L5 1 separate turn through toroid of T2.
T1 9:1 (3:1 turns ratio) 9:1 (3:1 turns ratio) 16:1 (4:1 turns ratio)
Ferrite core: Stackpole 57-1845-24B, Fair-Rite Products 2873000201 or two Fair-Rite Products 0.375 ″ OD x 0.200″ ID x
0.400 ″, Material 77 beads for type A (Figure 3) transformer. See Text.
T2 6 turns of AWG #18 enameled, bifilar wire
Ferrite core: Stackpole 57-9322, Indiana General F627-8 Q1 or equivalent.
T3 16:1 (4:1 turns ratio) 16:1 (4:1 turns ratio) 25:1 (5:1 turns ratio)
Ferrite core: 2 Stackpole 57-3238 ferrite sleeves (7D material) or number of toroids with similar magnetic characteristics
and 0.175
″ sq. total cross sectional area. See Text.
All capacitors except C12, part of C5 and the electrolytics are ceramic chips.
Values over 82 pF are Union Carbide type 1225 or Varadyne size 14.
Others are type 1813 or size 18 respectively.
Q1, Q2 MRF453, MRF460, MRF455 MRF454, MRF458 MRF421
Q3 2N5989 or equivalent
D1 2N5190 or equivalent
D2 Not Used
c.
Dotted line in performance data. b.
Dashed line in performance data. a.
Solid line in performance data.
* NOTE: Parts and kits for this amplifier are available from Communication Concepts Inc., 508 Millstone Drive, Beavercreek, Ohio 45434–5840
(513) 426–8600