Page 72 of HAM Radio 2009 by MFJ Enterprises, Inc.

air variable capacitors a b select mfj hard-to-find components for your homebrew projects ameritron edge-wound airroller inductor 404-1032 $140.00 flat wire edge-wound high power air roller inductor silver plated cu coil silver plate contact discs and contact shaft heavy duty 1/4 thick fiberglass frame 16 uh 31 turns 21/2 coil dia 1/4 round shaft 3 shaft length 23/4wx31/8hx8d used by ameritron atr-30 3kw pep ssb cap pf vrms gap plates dimensions figure part no price 1000 .032 50 $23.85 16-208 1.4wx1hx3d in a 282-2005 1500 .080 18 $14.95 10-26 1.4wx1hx2.8d in a 282-8700 640 .016 2-10 $17.25 2 1.4wx1hx1.7d in b 282-2010 1000 .032 13 5-51 $16.02 1.4wx1hx1.1d in b 282-2012 640 .016 20 $18.90 6-154 1.4wx1hx1.3d in b 282-2150 640 .016 40 $18.51 12-313 1.4wx1hx1.7d in c 282-2006 1200 .045 15 1.2wx1.3hx1.3d in 5-67 d 282-5050-1 $19.62 350 .010 15 1.2wx1.3hx1.3d in $17.97 6-180 d 282-5160 items d are broadcast style variables and are used in mfj analyzers and transceivers a 8:1 vernier drive is built into the capacitor c d high voltage air variable capacitors a figure aaabc d d e e d mfj s exclusive super heavy duty aircoretm roller inductor has an air core that can t burn up you get ultra high-q the lowest loss highest efficiency and highest power handling of any roller inductor in ham radio mfj s exclusive self-resonance killertm keeps potentially damaging selfresonances away from your operating frequency large self-cleaning wiping contact gives excellent low-resistance connection without contact arcing or burning a solid 1/4 inch brass shaft with self-align bearings gives smooth non-binding rotation 12 gauge tin-plated copper wire silver plated contact wheels and shaft fiberglass frame mfj aircoretm roller inductors silver plated edge-wound b c vrms 3.5 kv 1.5 kv 3 kv 1.5 kv 3.5 kv 1.5 kv 1.5 kv 1.5 kv 1.5 kv 1.5 kv gap .120 .045 .120 .045 .120 .045 .045 .045 .045 .045 plates 27 37 53 112 79 35 72 56 112 72 d e cap pf part no price 282-2007-1 $30.94 10-125 282-2018-1 $35.68 10-250 282-2008-1 $53.68 10-250 282-2009-1 $61.64 12-500 $53.52 10-300 282-2015 $70.56 40-493 282-2020 282-2028 $100.08 50-996 $69.95 12-67 282-2016 $89.95 18-136 282-2017 282-2026 $100.08 50-916 dimensions 2.5wx3.6hx6d 2.5wx3.6hx6d 2.5wx3.6hx10.8d 2.5wx2.6hx10.8d 2.5wx2.6hx10.8d 3.5wx4.5hx6d 3.5wx4.5hx9.6d 2.5wx3.5hx6d 2.5wx3.5hx10.8d insulated rotor sections a figure a b c b c dimensions 3wx3hx71/2d 3wx3hx91/4d 3wx41/2hx71/2d part no price l uh turns coil dia shaft size 2 31/2 43 $59.00 33 404-1052 2 3 57 $62.65 44 404-1056 2 21/2 31 $53.60 22 404-1060 item c is a differential capacitor as used in the mfj-986 antenna tuner items d are dual-gang capacitors capacitance specified is total capacitance items e are butterfly tuning capacitors used in mfj loop tuners have no rotating contacts super low losses c item has 1/4 round phenolic tuning shaft has no self-resonancekiller a and b have 1/4 round brass tuning shaft mfj air-wound coils are constructed with a solid rigid round acrylic rod and tinplated solid copper wires embedded into the acrylic rod they are super strong and superbly crafted mfj winds them tough so they stay wound select a special mfj air-wound coil for your mobile and portable antennas antenna tuners amplifiers and other projects part no price $22.95 $37.95 $37.95 $37.95 $22.95 $37.95 $22.95 $3.00 inductance 70 uh 44 uh 79 uh 77 uh 159 uh 35 uh 230 uh coil length 91/2 in 12 in 12 in 12 in 10 in 11 in 10.5 in coil diameter 13/4 in 2 in 2 in 2 in 21/2 in 3 in 3 in turns per inch 10 6 8 8 10 4 10 wire size awg 14 10 12 10 16 10 16 mfj air-wound coils amplifier high-voltage variable caps a figure abbbcccd part no price $26.19 282-2113 282-2112-1 $36.52 282-2572-1 $46.18 282-2573-1 $57.34 $44.95 282-2571 $51.68 282-2570 $44.95 282-5200 $39.95 282-3700 b c d cap pf vrms 20-823 800 v 20-250 2.5 kv 20-405 1.5 kv 25-800 1.1 kv 20-920 1.1 kv 20-171 3.5 kv 20-801 1.3 kv 15-176 2.5 kv 7-23 used in ameritron high power linear amplifiers item d has two capacitance sections dimensions gap plates .017 23 x 3 1.8wx1.8hx3.3d 2.8wx2.6hx5d .075 37 2.8wx2.6hx4d .045 37 2.8wx2.6hx4.5d .030 53 2.8wx2.6hx4.3d .030 49 2.8wx2.6hx7d .120 37 2.8wx2.6hx4.5d .037 59 2.8wx2.6hx6d .075 31 items b have delrin insulated shaft 404-0811 404-0600 404-0669 404-0700 404-0008 404-0024 404-0009 755-4001 mfj knobs pointers and ball drives a b c d designed to clip on air-wound coil for wire size up to awg 12 1/4 wide silver plated contact has set screw to secure contact socket for banana plug mfj high power rf rotary switches a b c d e f e f g h i fig abcdefghijklm part no 760-0035 760-0125 760-2281-1 760-0550 760-0275b 760-0277 760-0278 760-0276 760-2409 760-0176 760-0177a 760-0033 760-1233 j price pointer/skirt diam $1.25 1 inch $2.80 11/2 inches 2 inches $3.50 11/2 inches $3.00 21/8 inches $9.95 17/8 inches $2.35 7 /8 inches $1.95 7 /8 inches $1.95 13/4 inches $4.95 11/4 inches $1.95 13/8 inches $1.78 13/16 inches $1.25 1 inch $1.25 k l knob dia 11 /16 inch 11/4 inches 15/8 inches 1 inch 17/8 inches 11/16 inches 3 /4 inches 13 /16 inches 3 /4 inches 11 /16 inches 11/4 inches 7/16 inch 1 inch m height /16 inches /4 inches 7 /8 inches 3 /4 inches 13/8 inches 1 inch 11 /16 inches 5 /8 inches 11/2 inches 3 /4 inches 7 /8 inches 5 /8 inches 5 /8 inches 9 3 mfj knobs are made of the highest quality heat and impact-resistant phenolic resin shaft holes fit 1/4 round shaft knobs have metal inserts supplied with set screws fig part no price pos s pole sect index deg contact dielectric vac material dia 9 amps 1500 a 30 glass epoxy 1.44 500-2026 $24.48 12 1 1 9 amps 1500 b ceramic 1.88 30 500-2038 $43.68 6 1 1 9 amps 1500 c ceramic 1.88 60 500-2027 $58.32 6 2 2 9 amps 1500 d 500-2811 $45.60 6 ceramic 1.88 30 2 1 9 amps 1500 e 500-2135 $85.40 6 ceramic 1.88 30 4 3 17 amps 3000 f 500-3557-1b $147.58 6 ceramic 2.81 20 4 2 9 amps 2000 b ceramic 1.88 30 500-2017 $61.95 6 2 1 mfj high-voltage switches have 3/8-32 bushing and 1/4 inch round shaft d e and f are switches that are specially designed for amplifier band switching vernier reduction knob pointers turn counter set ball drive 726-0227r $1.55 mfj-tc11 729-0142-1 $11.92 red 11/4 length $14.95 matches 2 tuning 6:1 tuning ratio set includes knob used in counter ameritron module 2 726-0230r amplifiers gears and $1.25 and tuners dial mounting red 1 length plate mounting flange two bracket matches 11/2 tuning pre-tap pointer mounting driving gear knob holes mates with 1/4 shaft fits 1/4 round shaft counter both pointers are has pre-tap set screw holes ratio is 3:1 reset button 3made to fit 729-0142 digits counts up to 333 turns 1 1 /4 shaft 3 /4 length 6:1 reduction drive 72 mfj the world leader in amateur radio accessories!

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