rf - Free and Open Source Software

More documents

Recommendations

Info

Economy Ed Baker, W0EDO 993 7 Truman Road Independence, Missouri Chronometer How would you like to have an illuminated station clock for less than 55.00? The unit described was built at a total cost of 53.14 plus tax, but, with a wellstocked junk box, this figure co uld be reduced still further. The secret of such a bargain lies in the fact that most "electric" automobile clocks are really mechanical clocks which arc wound elect rically every two to five minutes. Since this winding is done by a pulse through an electro magnet, the clock doesn't care wh e ther this pulse is ac or de, thus making it a sim ple matter to power the clock in the home sta tio n. These clocks are available from your local salvage yard, and sell for 50 cents to 53.00, depending on the condition a nd whether or not you remove it from the wreck. The major enemies of auto clocks arc moisture and dust. The latter is the most common but least damaging. In selecting a clock, pick one which shows no sign of rust on the fa ce, hands, or any other exposed surface. and your chances o f restoring it to service arc almost a certainty. To remove the clock from the case pry up the edges of the bezel which holds the glass and remove these parts. Two or three small scre ws or nuts in the back of the case will now allow the clock to b e removed. A large eye dropper or "ear" syringe will su pply a low velocity air blast for cleaning. Do not attempt to use a brush, as fragments o f the bristles will catch in the gea rs. The most common cause of failure is in the winding mechanism. so a co mplete description of this operation is in order. On the back of the "works" is a rather large winding surrou nded by a rotary armature. When this armature is aligned with the winding, the clock is wound. As the clock runs d own, the armature moves away from the poles of the winding, and, near the e nd of its travel, a pin on the armature engages a Y-shaped yoke and closes a pair of contacts. These contacts are in series with the winding and the voltage sou rce . so when they close , the winding is e nergized and the armature is drawn toward 118 the poles of the winding. This rewinds the clock. This movement o f the a rmat ure also opens the contacts b y the action of the pin in the yo ke. This contact between pin a nd yoke is where trouble develops. J ust befo re the contacts close, the me chanism is at a point o f ma ximum friction and minimu m spring tension: so , with the co llection o f dust and eva po ra tio n o f lubrication. the clock stops just short of re winding. After all traces of dust have been removed, apply a drop of solvent/lubrica nt of the type used for tuners and volume cont rols (Quietrol, Spra Kleen, ctc.) to the yoke wh ere it co ntacts the pin. Wind the clock by push ing the armature, and start it by lightly pushing the balance wheel. It will probably stop just before the cont acts close. Without re winding, start it again and let it run until the contacts do clo se. Rewind and repeat until it runs freely from rewind to point closure. Dry the yoke and apply a mi nute quant ity of lubriplate (a very light lubricant cre a m available from hobby and gun shops) to the point of co ntact wit h the pin. If desired a small amo unt o f the solvent/lubrica nt ca n be applied to the pivots and teeth o f each gea r. The smallest drop you can get is slight ly too much for each point. so if you wish to skip this, the clock will probably run wit hout it for years. The points ma y be clea ned with a burnishing tool, b ut avoid excessive filing. Whil e the clock is " running in" the power su pply ca n be prepared. The transformer ca n be any, which gives the proper voltage. My clock used 12 volts. so a 6.3 and 5 volt winding were connected in series to give 11 .3 volts. This is plenty, since the winding is designed to work o n 10-14 volts. The transformer also ha s a 90 V winding which is not used, so the leads arc ta ped to prevent shorts and left hanging frce . T o determine the required voltage. look at the bulb in the so cket wh ich sits inside the case . If the bulb is missing, apply 6 .3 ac between the input terminal and fra me. and observe the armature. If it moves toward the poles of the winding (not necessarily all the 73 MAGAZINE
NOW! USE YOUR TAPE RECORDER TO LEARN CODE! Read code like a Pro! It's easy! PICK ERING CODEMASTER tapes give ~professional instruction on your own t ape machine from d igital com .~.-;~ puterized tapes! They .can't .be matched for t im ing accuracy! Beginners ~a_ ~.; '-',.:! get course of professional instruction at 5-9 WPM right on the tape! ~ : :i~ e:> Pract ice for General and Amat eur Ext ra ranges from 11 to 30 WPM. ~ Not hin g else like it! See below for CODEMASTER tapes you need. Get up t o speed! Order t oday! CIlI· 1: For Ih. beainner. A com· plete course of instruction is on •~. , the ta,e. Prlctice malerial " . , 5. 7. 9 WPM . Prepares yo u tor Novice ..am . Int rudes code groups end punctuation. eM· I V,: An intermedi , t. 1'1)8, IS' lIeci. lly lor Genera' Cleu ••am ....' study. No instruction; just prec- , ~:\ \ lice. liz hr 11 WPM.: 1 hr 14 WPM ; \.!!:,J I/ Z hr It 17 WPM . Includes coded croups I nd strl icht tnt. CM·2: For E. tra ·Cllss Ii" n.. study. Moslly sl ra1lht till; some code croups. 1 hour It 20 WPM; liz hour IIch I I 25 .nd 30 WPM. For rill QRQ , pl., this hipe .t twice speed ! CODEMASTER t.pes .,. 2·trllCk mon.urll; .....il.bl. in two silts: 7· inch rl.1 (31,' IPS) and 3 1.4·inch rMI O¥I IPS). Will play on a ny but full·track mlchin• . SPECIFY both type and size of fape , ou wanl. An, fl " , $5.95 postpa id USA 4th cll ss. An, two tapes, $1 1.00: .11 thre., $15 .00 PPO. Immedilte deliver,. CODEMASTE R t.Pts Ir. mad. only by Pict-nne Radio Compan" P.O. Box 29·A . PortsrnoutfJ, R. I. 02871. SatisfacUon CUl rant..d. way) use 6.3. If the winding buzzes and the armature doesn't move, the higher voltage will be required. When the proper voltage is found, let the clock ru n until it rcwinds a few times to make sure all is well, then re-install it in the case. Most of these clocks have a cable clamp on the back which will make a convenient point for t he ground con nection, or a self-threa di ng scre w can be installed in a spot where it will not hit the works. These clocks come in a variety of sizes and shapes, and take naturaJl y to panel mounting, or a small chassis or Mini-box can be used as a case. A switch may be installed to turn off the light, if desired, but the location of the bulb is such that it illuminates the clock fa ce and little else. so it is left on in my installation. The transformer can be mounted in the case with the clock, or up to 10 15 feet away. depending on your needs. Lamp cord is fine for this connection. This will not bring National Bureau of Standards or even IBM into the shack, but it is a reasonably accurate timepiece, and the price is right. ... W\l EDO •••••••••••••••••••••••• HATRY ELECTRONICS 500 Ledyard St., Hartford, Conn. 06114 (1 Block Easl of W.th.rsfl. ld A'll' . off Airport Rd .• Rte 6) Telephone: 203-527-1881 See CORKY, W1KXM or WARD, W1WRQ ANTENNA STUFF In 100 foot rolls only 450 ohm open w ire. Per 100 feet $ 4 .9 5 300 ohm open w ire. Per 100 feet 4 .65 Standoff·Mast or Screw- In .1 9 In 100 ft. interconnect.d coils 18 Co p perwe ld . Per 100 feet • .• • .• • • . . • • . . $ 1 .1 9 14 Copperw eld. Pe r 100 feet ..... . •.. . •.. •.. 2 .95 12 Ccpperweld. Per 100 feel .. . .. .. . . • . . . . . . 3 .99 14 Copper-Solid. Per 100 feet 4 .29 12 Copper-Solid. Per 100 feet .. •. •...•.. ...•. 5 .79 Times 14-50 l /Loss BU. Per foot . . . . . . . . . . . . . . 18 Times 15-50 L/la n 5BU . Per foot . . . .. •. . •... . 10 Times Solid Sheath A'umafoam in stock Kits w ilh connectors 50/100 ft Gl ass Llne-quv w ire. Per 100 feel 500 Ibs Test 3 .52 Glass line.g uy w ire. Per 100 feel 1000 Ibs Tesl 5 .27 Hy-Gain Balun. Each . .•.. •. .•• . . •. . • •. .• • ..14.95 W2AU Balun. Each . • . . . . • . •.. .. •. . • . • .• ••.•12.95 Blitz Bugs. Each ... • •.• •..•••.••..•. .•. .•. . . 4 .95 . A ll a nten na Insu lat o rs in stock. (Co nod io n Amateurs Send U.S. Funds Only) F.o .b. Hartf ord Please Includ e Postage • CO.vNECTICUT'S OLDEST llA.\1 ST ORE •••••••••••••••••••••••• Get your copy of our new fI YLj9r, d e r $,1.- The DENSON ELECTRONIC Corp, P.D.8ox 85, Rockville, Conn. 06066 - (203) 875·5198 M A Y 1969 119
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
Page 15 and 16:
Now your transmitter can work . •
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
Page 23 and 24:
(Sometimes, when I make like an SWL
Page 25 and 26:
-e,-,"' '.-- j - - , . .... .' 1 ,.
Page 27 and 28:
preselectors, it is a fine investme
Page 29 and 30:
WHAT IS THE BEST ". CO'. TO SET ,,'
Page 31 and 32:
I ,~ - Gel more receiver than you p
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
Page 41 and 42:
• ,~, • • • ••• 1>00"
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
Page 57 and 58:
declared that they " are and have s
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
Page 69 and 70: THE STELLAR - CASE STATION IS NOW A
Page 71 and 72: \ 1/ r------- - TO l(lollTlil " P I
Page 73 and 74: Step 4: In actual practice, VBE wil
Page 75 and 76: F ig. 1A (II SPLIC E C E ~ T E R CO
Page 77 and 78: How to Fly YOur Kite M. B. Crowley,
Page 79 and 80: Boulder Antenna 18 28 38 48 58 Tabl
Page 81 and 82: MH z. and consequently less paths a
Page 83: 30 a ~ ~ , I , I ~ V ' - 0 z I .' <
Page 86 and 87: 0 2 1!i0 'O!iV 8+ F ig. 2 . GAG7 Am
Page 88 and 89: I Telephone Beeper The following is
Page 90 and 91: the 20's and 30's the phone transmi
Page 92 and 93: • A Kilowatt Dummy Antenna •
Page 94 and 95: Mini-Bomb • Bill Brown 11".pSYK 2
Page 96 and 97: • DX'ing rom Joseph D. Burn ett ,
Page 98 and 99: Kalashi Nose, KH6IJ/l J0 Cam bridge
Page 100 and 101: Getting Your Extra Class License Pa
Page 102 and 103: - stage o f the game, it's a major
Page 104 and 105: e-radiation produced by the molecul
Page 106 and 107: and direction usually undergo chang
Page 108 and 109: Just to complicate things, most aur
Page 110 and 111: ----- ---- o F[EO------- - - ---- -
Page 112 and 113: corner reflector is sometimes incor
Page 114 and 115: known that almost any spaci ng (wit
Page 116 and 117: NEW BOOKS Electronics for Technicia
Page 120 and 121: 4 x 150 Sockets Larry Jack, WA3AQS
Page 122 and 123: Alan Shawsmith. V K 4SS 35 Whynol S
Page 124 and 125: Handbook is easy to use and accurat
Page 126 and 127: TEST E UIPMENT 'IIi\IATUHE TEST L\U
Page 128 and 129: SQUEEZE ACTION TOOL A MUST FOR THE
Page 130 and 131: Adapting A Mobile Antenna System or
Page 132 and 133: LETTERS This is in response to your
Page 134 and 135: Also, I thought that the ta x-exemp
Page 136 and 137: --r..ta U 8H NEW G&G CATALOG! MILIT
Page 138 and 139: we would retain responsibility for
Page 140 and 141: LARGEST SELECTION In United State.
Page 142 and 143: HAMFEST sponsored by Lancaster & Fa
Page 144 and 145: JOHN MESHNA JR. 19 ALLERTON. ST., L
Page 146 and 147: LIBERTY PAYS MORE! LIBERTY OFFERS M
Page 148: NEW DRAKE MODEL • TR·B 6-M SIDEB
show all

rf - Free and Open Source Software

Create successful ePaper yourself

Delete template?

Save as template?