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The Little Wonder Eddy Shell, WSZBC 1209 Holiday Pla ce Bossier City, Louisiana 71010 Every new QTH for the typical ham brings its own antenna problems. Returning to college to pursue additional graduate studies brought the age-old problem of how could I affix an antenna to a college dorm and not come under the watchful eye of the college authorities? The "Little Wonder" and an antenna tuner was the answer to my problem . The basic idea came from an AFMARS antenna presently being used by some of the Texas members. This antenna is a normal 40-meter dipole with a coil at each end. The coil consists of 197 turns of No. 12 nyclad wire. close wound on a one-inch stock. It is tuned with a 48-inch pigtail which tunes 3311 kHz with a I: I SWR, with the ability to have a full-size 40-meter dipole for 7305 and the amateur use as well. (1 inch equals 50 kHz on the pigtail.) The "Little Wonder" gets its name from the fact that it is a little wonder that the "Little Wonder" works. My first contact on 40 meters was a W3 in Pennsylvania, with a barefoot KWM2 at ten o'clock on a Saturday night and with the "Little Wonder" leaning against a wall in the kitchen location of my "ham shack." Construction is simple and all parts can be purchased locally: I 3/4" hard drawn copper tubing 31 W' (junk yard , Sears, etc.) I 3/4" hard drawn copper tubing 43 3/4" (junk yard, etc.) 46/32 I" brass bolts and nuts 1 36" oak dowel rod (fir will work, but oak is stronger) I roll of plastic tape I 55 feet of No. 12 nyclad wire (motor rewinding shop) I single-wire feedline to run from Little Wonder to antenna tuner... J used 8', 33', and 59' (when it comes into the room it could be hot with rf, so use a rubber or plastic coating on this section). I have found the 59' to work best with the Little Wonder about 35' up on top of a TV mast ; however, at school the Little Wonder sat on the window ledge-so who knows? 23/4" bar stool rubber feet 1 24 "xI" plastic water pipe to cover coil after assembly I '~----- ,,' - - - - - - - - l " X 4 0 T ,.. • OR VI I(IIO G MAT CH BOX '" r-V: '~'~,.::. ' .-'-~ ," ,, : : -*- 2' ~ , T , , 3 /4 " TV MA"S T TO HOL D L ..:1-_ LIT YL[ WO"'DE:R I'" TH[ A lII The Little Wonder How to construct: Drill a small hole in the wooden dowel 8" from one end. Twelve inches of No. 12 nyclad wire is pushed through the small hole. One person holds the 55 feet of No.12 tight,and the second person starts turning the dowel rod until 197 turns have been made. A second hole is then drilled, and the other end of the No. 12 wire is put in this hole. Friction and the bend of the wire holds the coil in place. The dowel-coil assembly is pushed into one end of the 43 3/4" tubing, and the other end Of the coil is pushed into one end of the 31 3/4" tubing. A 6/32 hole is drilled through the tubing and dowel and a 6/32 bolt makes a mechanical connection of the tubing to the pigtail of the coil. A third hole is drilled opposite the coil in the end of the long tubing, one inch from the end. A 6/32 bolt is placed in this hole for the single-wire feeder to be attached. The over-all length of the Little Wonder is 7'5". Rubber bar-stool feet are then placed over each end of the Little Wonder to keep out the weather, and the coil section is taped for the same reason. Attach your feed line and work the world. How to tune the "Little Wonder" ; The best method of tuning the rig is to tune the unit into a 50·ohm load and then connect the antenna tuner. (Do not tune the rig.) The antenna tuner is tuned for I : I SWR . (A Viking Match Box will work fine; or make your own.) How does it work? I am on the air with a lone KWM2 from 3311 kHz to 28 Mllz, and without it I'd be QRT for the nine-month period. Trust you will be on the air soon with your own "Little Wonder" ...W5ZBC 30 73 MAGAZINE
I ,~ - Gel more receiver than you par for: 11 Iron t panel controls. 12 1 J" slide-rule dial in flve colors. cont inuous covera ge from ;135 Kl lz to 30 Ml lz including illuminated elect rical hanrlspread for !liD-l0 mete rs (ha m and Cll). separa te logging sca le. s e uail ivit y good to 0.5;1V at 30 MHz. St and a rd :\~I recep tio n. a product detector fo r 5SB 'C \ V. fast and slow Ave. variable pilch BFO. cascad e RF stage. noise limiting in both the IF and audio s tages. Zener stabilized so usual warm-up d rifl is virtually absent. OTL audio. illuminated "5 " meter. buill-in monitor speaker plus front panel jack fo r external (optional) matching speaker. Uses over 30 semiconductors - no tubes. no n uvistors - irs lOOo 1t solid s la te ! O bsole tes tube r eceivers a nd their warm-up delay, ban is hes dependence on house current 10 s tay in operation. If current fails o r isn't a vaila bl e, the D X-1 50 runs lip 10 100 hours on 8 " 0" cells. It will operate from a car's cigarette lighter or any ".2 VDC lH'g
Page 1 and 2: WORLD'S LARGEST INDEPENDENT HAM MAG
Page 3 and 4: MAGAZINE 73 Magazine 11'104 , May 1
Page 5 and 6: .. .. .... .", , , .. ...... ."'"".
Page 7 and 8: Here are several hams who have achi
Page 9 and 10: New 500-Watt 5-Bander from NRCI You
Page 11 and 12: , I ....- , 0 0 ====j .- .'Q ' 0, .
Page 13 and 14: ohm coaxial cable off ce nte r will
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Page 17 and 18: e AC and DC SUPPLI ES BU ILT IN! e5
Page 19 and 20: If you're thinking about boning up
Page 21 and 22: y t hose whom I thought were of hig
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Page 27 and 28: preselectors, it is a fine investme
Page 29: WHAT IS THE BEST ". CO'. TO SET ,,'
Page 33 and 34: the boom, shorting all loops so tha
Page 35 and 36: The lassie 36 With Patent Approved'
Page 37 and 38: look (electrical) at il. I took my
Page 39 and 40: ROHN, as the largest tower manufaot
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Page 43 and 44: transmission line or the rf voltage
Page 45 and 46: sumed. A signal generator of suffic
Page 47 and 48: may not have enough rf available to
Page 49 and 50: cuitry developed through the earlie
Page 51 and 52: The Super SS Clifford Klinert 520 D
Page 53 and 54: present one, a boornless quad, was
Page 55 and 56: HOWARD W. SAMS Famous Editors & Eng
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Page 59 and 60: and the state regulating agencies.
Page 61 and 62: '0' '" '0. Fig. 2. T he direct r ea
Page 63 and 64: 2 A 7/ I 1/2 ). ----~I/~--- 2 1/ 8
Page 65 and 66: 0000 O' A"'( TE ll " • "'''''' 10
Page 67 and 68: Add This Simple Decimal Readout to
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Page 71 and 72: \ 1/ r------- - TO l(lollTlil " P I
Page 73 and 74: Step 4: In actual practice, VBE wil
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Page 77 and 78: How to Fly YOur Kite M. B. Crowley,
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MH z. and consequently less paths a
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30 a ~ ~ , I , I ~ V ' - 0 z I .' <
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0 2 1!i0 'O!iV 8+ F ig. 2 . GAG7 Am
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I Telephone Beeper The following is
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the 20's and 30's the phone transmi
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• A Kilowatt Dummy Antenna •
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Mini-Bomb • Bill Brown 11".pSYK 2
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Kalashi Nose, KH6IJ/l J0 Cam bridge
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Getting Your Extra Class License Pa
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- stage o f the game, it's a major
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e-radiation produced by the molecul
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and direction usually undergo chang
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Just to complicate things, most aur
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----- ---- o F[EO------- - - ---- -
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corner reflector is sometimes incor
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known that almost any spaci ng (wit
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Economy Ed Baker, W0EDO 993 7 Truma
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4 x 150 Sockets Larry Jack, WA3AQS
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Handbook is easy to use and accurat
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TEST E UIPMENT 'IIi\IATUHE TEST L\U
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Adapting A Mobile Antenna System or
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