JUNE

Western Kentucky DX Assn. will operate KB4ALC from 0001 UTC June 6th-2359 UTC June 7th. in celebration of the annual Corvette Homecoming in Bowling Green Frequences 72B0 14280. 21380, and 28480. Stations coniacted may request a certificate by sending a QSL to Kenneth E. Newman KB4ALC. 505 Emmett Dr., Bowling Green KY 42101. 3 if you're a No-Code Tech, and you're havjng fun operating, tell us about it Other No-Code Techs will enjoy reading about your adventures in ham radio and we'll pay you for...

S

Fig, i, Two-element phased beam for ARDF, Caution Keep the feedline parallel to the delay line by mounting it along the boom. otce 716-425-R759(BBS after 5PM) Kjx 7k -22*-6l< > 8 This huge 472 page Third Edition includes over 770 shortwave and amateur communications receivers made from 1942 to 1997, Here is everything you need to know as a radio collector or informed receiver buyer. Entry information includes receiver type, date sold, photograph, size & weight, features, reviews,...

Exhibit Space

See our Web site for more information, (www.hamveniion.org) For an application, please Fax (937) 376-4648 or E-mail to exhibits hamvention.org For an application, please Fax (937) 276-8902 or E-mail to fleamkt hamvention.org Flea market spaces are sold IN ADVANCE ONLY. No spaces sold at gate

Mexico Philippines

Harokj.-tfid you ever notice when you look up at the clouds., il looks like the tower is failing over Number & & on your Feedback card Turn your old ham and computer gear into cash row. Sure, you can wait for a hamfest to try and dump it but you know you'll get a far more realistic price if you have it out where 100.000 active ham potential buyers can see ii rathet than the Jew hundred local hams who come by a flea market table. Check your attic, garage, cellar and closel shelves and get...

Communications

MAIL Hamvention Box 964 Dayton, Ohio 45401-0964 PHONE (937)276-6930. Chairman Voice Mail box numbers are available on our Web site. General Chairman Dick Miller, N8CBU Assi General Chairman Jim Graver, KB8PSO Make checks payable to Dayton HAMVENTION Enclose the amount indicated in U,S, dollars. For credit card orders, piease add S1.25 ticket sen ice charge. A 25 service charge mil be assessed on afi returned Checks.

Dealer

Barry's supple ail MFJ products Call direct. KANTflONJCS satellile Tt-ephon orlij -wie a use1 Ro Fra-m cajmry to tjunlrv and ir ke and -ecEive pheni cei - Sli. I r> i GARMtN A MAGELLAN G I. O B L WpT ONWq SYSTEMS ANTENNAS A-5. AFS. CushciaH, Hy-Qaln I Uslor. KLM, MET7. Ursar- MODUEL.OX. TONMA. EL.IL- i uI, Multi Band dpSia Df fl, A Ll. Ar t na Stacialisl. Barkel Come , Oian j il . GAP, laresen, Etn. Wall Ma ers StcckeKl. ANTENNAS A-5. AFS. CushciaH, Hy-Qaln I Uslor. KLM, MET7. Ursar-...

Call Toll Free

< 600 292-7711 orders only Se Hab la Espa oE (JpiSHlPPWQ iBi.UICSi'-rv - EPi r'all cp se i ails . Hew* - l ada * 5 SO Vf . flfIPE N IH AVE NUf WHEELING, II 0M Iti 7 1 (SI l< - FA (t1j r H 1 - 'JDJ '. (p tutw it** 15DA MONEY SACK GUAHANTEE FULL FACTORV WARRANTV CALL OH WRITE F H OUR NEW f REE 64 PAGE CATALOG (BOO) 445-330 - Oft* ht JurwM w 'Cif ' iH Ij- 0 irneft* l jGi-ir ftifl.*cy iur Bf * 2Urtz wme - C gcta JJT r- er * Distal Trlpi P wbj SjF P*y uii't ui(i f ichBL> ptnpcli. R - du* on a...

Klad

A two-element phased beam for ARDF Ya Gotta Shop Around Take your time, do your homework, and get the best deal On the cover Captured on film by Joe Moeil KOOV. this ammo-box fox first appeared in the pages of our March issue. You can find foxhunting fun every month in Joe's Homing lnv column. Feedback Any circuit works better with feedback, so please take the time to report on how much you like, hate+ or don't care one way or the other about the articles and columns in this issue. Q - great ,...

Info

Where the lace is Well, that's what NASA's Dr. Michael May land said. Now that's weird. I can understand thai N ASA might say the camera would be turned off, but I'll bet it won't he. Thus, it they find clear signs of a current or past civilization the might want to keep that quiet. Why Because that would put on the pressure to send astronauts to explore it, and NASA. I suspect, knows thai there is no way with our current technology to ei an one into space safely beyond the Van Allen belt Moon...

Mfj

Nearest dealer Orders ., . 800-647-1800 http w w w. m fjenterpris es .com F A X (60 J) 323-6551 * i year No Matter What warranty * 30 day money bacJc guarantee (less s& h) on orders from MFJ * Add sfb r.O. Box 494, Miss. State, MS 39762 (601) 323-5869 8-4 30 GST, Mon Fri Technical Help (601)323-0549 Priccs and specifications siifrjcct to l hangt. MFJ Enterprises, the world leader in ham radio accessories Young hams interested In speaking at the 1993 Dayton hamvention Youth Forum are...

Circle On Reader Service Card

73 Amateur Radio Today May 1993 61 Dave Miller NZ9E 7462 Lawter Avenue Niles IL 60714-3108 drniller14 juno.com Moderator's note Roger and Ron Block of Poly Phaser Corporation have put together a well-written series of tips and suggestions on how u e can pr tcci our ham radio stations from the effects of a lightning strike. So fur in this series (which be-nan with the January IW8 issue), they have covered some interesting lightning statistics antenna location the importance of a single-point...

Amplifier

The internal circuit of ihe MWAJJO and its application as an amplifier increases the resistance of a conductor when the conductor's inductance crowds the current to the outermost surface of the conductor so that the current-carrvinu cross-sectional area i> decreased and the resistance increased. Skin effect is a function of frequency, permeability ( l) of the conductor, and the conductivity ( a) of the conductor The critical depth 3 where 63 of the current is concentrated is 6...

Circle On Header Service Card

A New England ham is protesting an FCC mistake that reassigned his old callsign to another radio amateur before the end of the two-year waiting period. The problem began when Ron Toller N1RT learned that the FCC had reissued his former callsign. W04L, to a Florida man less than 12 months after Toller gave it up in 1996, The FCCs vanity rules state that cailsigns will be held out of the pool for two years before being reissued. Toller said a spokesman at the FCChs Gettysburg office blamed the...

BNB

CLASSrC RADIOS. adioFinder Web list revised weekly www. radiofmder.com Tel FAX (3i3) 4M 1890 TirtdertiradiafifxSef com . BNB7DQ AMERlTRONAl-eOA. Good Condx. 15015 m. S500. Ship stateside only. K9MKN (219) 656-4019 after 6 p.m BNG59 Why & uy a t)Q* of batteries' for hundreds of dollars Current regelated, AC powered, lully assembled wi h ft 12 AWG silver electrodes, 74.50. Same, I ul DC powered, S54L50. Add 2 50 shipping Thomas Miller 314 Soalh 9> ti Street Richmond IN 47374. 0NB342 Audio...

Uyc

Key 'Back-ordered. Used, 1-2 weeks. Not all items, service manual 35 -Special order, Service manual 50. Including service manual. DService manual in stock but no price quoted. dealers offered a package price for all items. Caution Be sure that when a total price is listed* that alt items requested are included* Several of my quotes looked really good at first, hut on closer e Kami nation I discovered an item or o hud been omitted- i do not believe this was intentional and...

Lm

In parallel with a key on my DTMF microphone. When WxWarn activates, the I ,ED turns on. the LCD counter increments by one, and my base VHF radio sends a DTMF tone on a pre-chosen frequency to the dual-band radio in my car My HT is tuned to receive that signal, which is duplexed from my car My interface is very cosi-el-fective and pro ides me with a few desired functions. Some other ideas for output devices could be buzzers, mac-driven lights, autodial alarm systems that dial a programmed...

Additional Items

Modet 99 Heat Sink 6.51' * 12ri X 1.6), 24.00 CHS-S C pjier Spreads ( V K 3 0), S24 00 Law Pass Filters (up to 300W) for harmonica Specily 1PM, 15M, 20M. 40M, SOM or 16DM HF Splitters and Combiners up to 2KW t fi M I iil- 1371 Vt ' Pk cEi.rrtli. Otll 45434 B40 Fhoiir * I'm I I

Adapter Shorting Box For Meters Only

Details of the adapter shorting box and comKerpoise radial hookup used at he base of ADIB's G5RVdipole antenna to permit him to temporarily utilize the antenna on 160 meters as a top-loaded vertical. event, and if a proper single point grounding system is in place, the voltage on the shield to ihe equipment u ill not exceed 10 kV. A basement is an ideal I oca-linn for a ham shack, li s close to ground and generally has the lowest inductance run to the exterior grounding system. Because...

All Fluke Products Oh Saleis

36 Lae (Mu H M CDfr ir,.v -u A.Sfi--.t id l,i,l MO rth a -.nrrfiL rtm 1pr nruy.'jM LVI Ihi hte*, rblii * MoA S lana Wco i 7TIH Hb* MoctalwaE 4+6 fIT II 137b y-jTiit Ofl flE SM HtttiaM tiw Uflit sj a iv f 'jiiasi uto f- UTdti sw m fcii b 3c1-fli i ianc 0-1*3 m PODOME Timfifi .l'.wn -r-0 c ( 750C DC tfillK D-2 V up 1 7 M-2 D > - Aj Ce 'i- J 1 luu Ov fcl LJ uppiiH Ji DM Unil tOCl pflag 3 Fl ltd 2 Functions Req to 4 MHz nduc ance CapacrlLince II iLUJtfi* pauJin< ) 'fsq i HMHj, up lg Muf UL'lS-J...

An RF Sensing Alarm

Save your power amplifier stages and your reputation.J Bertrand Zauhar VE2ZAZ 4176 Sylvio St. Laval QC H7R 5V8 Canada Have you ever walked into your shack and found out that one of your transceivers was on the air Surprise Thai has happened to me twice in the last couple of years. Once iL was the packet TNC that had crashed, leaving the two meter transceiver on ihe air for I don't know how long. That obviously blocked the entire packet BBS traffic. Whoops The second time, my 70 cm satellite...

Astron Power Supplies

Heavy duty high quality * rugged * reliable SOLID STATE ELECTRONICALLY REGULATED FOLD-BACK CURRENT LIMITING Protects Powef Supply jrom excessive current & continuous shorted output CROWBAR OVER VOLTAGE PROTECTION on all Models tiCcpl HS-3A RS-4A, JIS-5A- RS-4L AS SL MAINTAIN REGULATION & LOW RIPPLE at few line input Voltage - HEAVY DUTY HEAT SINK CHASSIS MOUNT FUSE THREE CONDUCTOR POWER CORD except for RS 3A ONE YEAR WARRANTY * MADE IN U.S A

Fm Exciters

TA51 for 6M. 2M 220 MHz KU SS9 w't S169 TA451 for 420-475 MHz. kit 99, w t 3169 TA3 1 for Q02-92B MHz, (0.5W oui). w t 169. Output levels from 1QW to 10CWStarting at S99. - R100VHFFM RCVR, Very sensitive - 0 15jjv Superb selectivity, > 10Q dS down at 12 kHz, best avail-at re anywhere flutter-proof squelch. For 46-54, 72-76. 140-175, or 216-225 MHz kit 129, w t 189. * R144 RCVR. like R100. for 2M. with helical resonalor in front end. kit SI 59, w t 219 R451 FM RCVR, for 420-475 MHz Similar to...

Wrb

Where ERP is the effective radiated power (i.e transmitter output times antenna gain). Richard Tell has used this equation in Broadcast Radiation Fig, , Comparison of calculated and measured near field strength from a 40 W two-meter station. How Safe is Safe '1, EE Spectrum, June 1997. Now we must correct for antenna gain. Since our antenna is a dipolc, its gain is 1,64 relative to a perfect point source. Also, our transmitter output is 40 waits. Our formula then becomes ERP M 40, and

Yiu

Where E is the field strength in volts per meter and 13 is the distance from the transmitting antenna in meters. A plot of this curve is shown in Fig, 1. Also plotted arc readings taken with a spectrum analyzer and a calibrated bieonical antenna. The transmitting antenna was a horizontal dipole cut tor the two-meter band and tacked to a fence lour feet above ground. The measuring antenna was also horizontal Ii was mounted on a tripod four feet above ground. The calculated and measured curves...

Frequency Control Input

Fig* Block diagram of it basic phase-locked loop system with the major functions shown. Iig. 2. Block diagram < > fa basic DDS w ith the major functions shf> vni li isn't neccssary that the clock and VCO he on the same frequency. In fact. they are rarcl> ever on the same frequency. To achieve u frequency separation and still obtain the 90-de-gree phase shift, the -ignals led into the phase detector may be shifted to any design-convenient frequency. ivpi-caliy lower, A frequency divider...

Gmw

Ow won grt fi F rpreamplifier. Figs, 1-5 are shown as singleturn loops, but lhat is a graphical convenience, and both single-turn and multi-turn loops are intended. The loop is tuned h> a capacitor One end of the loop and the loop w inding is grounded as is one terminal of the .impli-fier input, A variant circuit is shown in Fig. 2. The version in Fig. I uses the main loop to pro-v ide signal directly to amplifier A1, while the variant version of Fitf. 2 uses a coupling loop...

Jwu

ALL YAESU Replacements Including NiMH Super High Capacities DARE TO COMPARE Yaesu Replacements FN9-25M 7r2v NiMH) FNB-27SM (12v NiMH) FNB-11M (12v NiMH) Universal Battery Charger NOW ONLY 49.95 + FREE GIFT Policies & prices subject lo change without notice Amateur Radio * Cellular * Laptop Computer * Alarms Advanced Battery Systems, Inc. T 300 Centre SUeel * Ho brook, MA 02343 cars. Hams in most countries are out there on foot. It's good exercise for some of .you pork-bellied hams. What...

Hard To Find Parts

Moder ATV-3 (420- 450) (Ga AS - FET) 549,95 69.95 Moder ATV-3 (420- 450) (Ga AS - FET) 549,95 69.95 Model ATV-4 (9 2-926) GaAS * FET) 59.95 79.95 * Broadband H F Transformers - Chip Caps - Kernet ATC * y& iaiclad Mice Caps - nflico Semc AHC SPHAGUE Trimmer Capacitors Can got ypu virtually Hpy FtF transistor Call us for slrange hard to find parts

Homebrewing Italian Style

Corenzio, 10 84129 Salerno Italy Packet flK8VWA IK8SUT.ICAM.ITA.EU E-mail ik8vwa hotnnaii.com Id like to share with you the antenna I built to take part in the Town of Salerno, Italy*1 A RDF challenge, my first experience in this kind of amateur radio activity. Thanks to my homemade beam, I've reached the fourth absolute place, 26 seconds Photo A. The author, ready for the RDF Photo A. The author, ready for the RDF challenges handie-talkie in one hand, twO-element phased beam antenna in...

Pws

Ffjp, M, High -pass filter. 56 73 Amateur Radio Today May 1998 Fig. 7 . j 7 wjA-pw preamplifier. loop. If the coupling loop of the antenna is used fas shown), then winding C is a low-impedance winding, Lf, on ihe other hand, the main loop is used, then he impedance of winding C must be higher. Windings A and B must match approximately 1.000 ohms, while T2 must match lt700ohms. The transistors used for the circuit of Fig, 8 are cither 2N4416 deviecs, or the service...

Lkw

Shipping All orders add S5 00 handling 'plus there is an additional at cost shipping charge added to all foreign orders. We ship UPS where possible please give us street address Make checks payable to 'Radio Bookshop.' Foreign Orders Choose one .surface shipping air shipping (Surface delivery may take 2-3 months,) Note The actual foreign shipping costs will be additional to the regular shipping and handling fees.

Low Noise Receiver Preamps

* Make your friends sick with envy1 Woilt stations hey don't even know are there * ins al one a the antenna and overcome coan losses * Available for 28-30. 4& 56, 137-152, 152-172,210230, 400-470. and 800 960 MHz bands NOW ONLY 24 kit, S44JwAt Miniature MOSFETPreamp Solder terminals allow easy connection inside radios. Available for 25-35, 35-55. 55-90 90-120. 120-150, 150-200 200-270. and 400-500 MHz bands. TRANSMITTING & RECEIVING CONVERTERS Canven vhf and uhf signals to & from 10M...

MAY

BEAVERCREEK, OH Members of the Upper Valley ARC will be assisting nine-, 10- and 11-year-old elementary school children as they hold their special event station commemorating the 4th Anniversary of Parkwood Elementary School's fourth grade class Adopt-A-Ham Program Mike Fisher KI8CJ is founder and instructor of the students involved in this program. Each volunteer ham is assigned four or five of Mike s students in the beginning of the school year. On a weekly basis the amateur and children hold...

N

PoH& riVyj rite DVM mf j rtfc uirgfloMtf a to ine tatteries* H.TiAtg a 3PDT switch* an output voltage that is the negative of the input voltage five volts positive in (from the fourNiCds), minus five volts out. Put a diode in to protect the meter and you have nine volts between the positive and negative voltages. Actually. you do not need a diode at all, as the meter is designed to operate at up to 12 volts (absolute maximum). Because planned to mount the meter permanently in the...

New

S1TOR A B ARQAFEC BAUDOT PACKET NAVTEX FAX 480 AMTOR WEFAX SYNOP ASCII r J RTTY b-3 SSTV 5 CW HP- Packet Only 49.95 HP-2M MuhiAfode 69.95 he hesL Utile packet modem juM go better Building on the tradition of ie UP-3 Pack el Modem, we iire very proud to announce ihe BP-2 iind BP-2M The I i I'-2 is a new and improved version of oorfemutis BP- L while ihe BP-2M expands your horizons c en further wnh MultiMode operation' Si whether you ha e heen voting to juiornjif your CWF ehcckout AS m )K r> r...

On A M At Eu

Advanced registration orders must be postmarked no later than May 1 (USA) or April 24 (Canada). m A limited number of paid reserved ADA parking permits are Ticket requests that are received AFTER the deadline Will be available. Free ADA off-site parking is also available. Please processed and HELD for pick-up at the Hara Arena box send requests via Fax Phone (937) 669-1163 or E-mail

Painfully Bright Red

T 1 3 4 (5 mm diameter) red LED Significantly brighter than conventional LEDs. Water clear in citl-statc. r , 20 filtering the output signal. Filtering of the output also improves the spectral purity of the signal by removing the alias signals and the DAC-imposed amplitude approximations. However, with the alias filter removed, the DDS will provide predictable alias signals and harmonics weil above the clock frequency, as shown in Fig, 5. The alias frequencies are found...

S Your

Vreeland W6YBT 45 Maywood Drive San Francisco CA 94127 During much of last year the FCC repeatedly yielded to pressure to relax its RK safety regulations First stations running less than 50 waits* and then push-to-talk mobiles, were exempted from evaluation, Then the deadline for evaluation was extended from January of lL)97 to January of this year Now they have ruled that amateur stations running less ihan the specified power level on each hand are exempted from e aluation....

The Team

Contributing Culprits Bill Brown WB8ELK Mike Bryce WB9VGE Joseph E Carr K4IPV Michael Geie* KBTUV Jim Gray W1XU 7 Jack Heller KB7N0 Chuck Houghton WB6IGP Dr. Marc Leavey WA3AJR Andy MacAllister W5ACM Dave Miller NZ9E Joe Moetl KOOV Sieve Nowak KE8YN 4 Carofe Perry WB2MGP Frances Hyvannen Roger Smith 603-924-005B 800-274-7373 Fa* 603-924 8613 Editorial - Advertising - Circulation Feedback - Product Reviews Amateur Radec. Toda Magaiine 70 Route 202N Peterborough NH 03458*1107 603924-0058 Fax...

Kxw

With the existing design, when you're listening to weather from the monitor, you should lower the volume u> prevent ihe interface from activating. Human speech is typically from 300-3000 Hz, Modifying the input filtering hy adding additional second- or third-order filters can sharpen the input response skirts to prevent ordi-nan audio from triggering the interface. Detailed circuit Interface description ()p amps I 1A and I' IB are cascaded it) produce a second-order, low-pass filler,...

We Now Stock Commercial Communications Systems

EALEH NC JiHiQS INVTTED PHONE IN ORDERS BE RFIMRUFlHED COMMERCIAL RADIOS STOCKED 4 SEflVtCE ON PREMISES. sxPORTordersMjp d imm ea'aiRlv CALL TechniEHi help o tar d upon purclwM FAX 21 2-925-7001 respectable job fur a 'compromise' lop band skyhook hat follows is what I've found to work nicely ai my QTH and il should he adaptable to others. the way, an earlier ver-si on of (his idea was described in CQ Magazine some years back, but this latest configuration seems to give better results iat least...

Seagon Company Oak Ville Center Suite

11 was apparent to me that here was a perfect application for this project The meter circuit uses only a few mi I li amps and I do recharge often. The bq2903 prevents overdischargc if I leave the meter on too long there is no chance of overcharging, as the bq2903 ends the charging cycle when the batteries are charged. If 1 leave the meter unused for months, the batteries wilt still he ready to go. If I lei the batteries discharge deeply, the bq29G3 circuit will recharge them in only a few...

MODEL

*Holds ell Hamstick Antennas and rnijr y others. Gvor-10C'tf of Molding power 2 KU tool print 3620-9A Whitehall Ftd., Anderson, St 29626 - 864-226-6990 FAX 864-225-4565 i E-ltfaii hamstick hamstick.com www.hamstich.com 3 S X 24 hh re jLJ mounting iS'R Se c x w PL-259 no rust Aluminum construction ALL 100 MADE IN USA Add 7 per order S H *Holds ell Hamstick Antennas and rnijr y others. Gvor-10C'tf of Molding power 2 KU tool print 3 S X 24 hh re jLJ mounting iS'R Se c x w PL-259 no rust Aluminum...

Every Issue Of

The entire run of 73 from October 1960 through last year is now available. Over 800 fiche You can have access to the treasures of 73 without several hundred pounds of bulky back issues. Our 24x fiche have 98 pages each and will lit in a card file on your desk. We offer a battery operated hand held viewer for 150, and a desk mode for 260, Libraries have these readers. The collection of microfiche, is available as an entire set, (no partial sets) for 325, plus 10 shipping (USA). Annual updates...

Mfjmv

MFJ's heavy duty c o n v e nt i ona 1 po wer s u p pi y is excellent for powering your HF or 2 Meter 440 MHz transceiver and accessories. A massive 19,2 pound transformer makes this power supply super heavy duty it delivers 35 amps maximum and 30 amps continuous without even flexing its muscles. Plugs into any 110 VAC wall outlet. It s highly regulated with load regulation better than . Ripple voltage is less than 30 mV, No RF hash - it's super clean Fully protected has over voltage protection,...

Outernet

There's a Kantronics 9612 'tus about to enter 1er Wee aboard Mir Packet, GPS APRS, Host, KISS and WEFAX modes Personal Mailbox (PBBS) row supports multiple calls Copies NWS EMWIN with optional software Remote access, sensing and control with two A D and two KA-Noae or option K-Net networking capability PBBS 100k, expandable with optional 512k RAM Uses external power or internal 9v battery NEWU5ER mode and online help 3,2 Firmware now with Advanced GPS APRS Ul digipea ting available for alt 3...

Ggte

- - - F ri r n mr. et immwrn - 82 78 Hamsum 4 42 tsotron 65 242 Jan Crystals 13 T 275 * Maggiore Electronics 33 335 Menu Plus 5 86 MFJ Enterprises 7 Michigan Radio 39 193 Morse Tutor Gold 82 240 Molron Electronjcs 59 246 Matron Electronics 73 114 Mr. Ned 27 ' P st BPQS> irii 33 68 Radio Book Shop 57 Radio Book Shop t 59 Radio Book Shop 75 Radio Book Shop 86 254 Ross Distributing 18 167 Sescom, Inc ____ 49 188 SGC. Inc 81 141 The Nicad Lady 69 269 Tige rtron ics 51 259 Versatel Communications...

Kenwood

Radios for Business, Governments, Consulates, Embassies. Stocked and Serviced. Overseas and Domestic Orders. YAESU HAM amp VEHTEX BUSINESS RADIOS' FT51-R, FT-asoo. TOO, FT-11, FT-25Q0, FT30 0, FRG-100B. FT- GOOD. FT-5 R, VXin, FT'940. FTSMAT, FT- J20, VXR-50 G repeater 25 walls, VHr ar UHF. Manne Mobile VXM-100 HAM, MARINE. BUSINESS AMD AVIATION RADIOS A-2 amp C-T7, C-70 amp . IC- 07, C-T A IC-75C IC- GXAT, C-Wj A, IC-2Q7H NEW rao.7 F.hC-LI VlOO

Joys Loud Enough Metronome Part

Evert Fruitman W7RXV 2808 West Rancho Drive Phoenix AZ 85017-2646 fruitman asuchrn.la asu eduj Last time, you II recall, we went through the story of why I decided to huild a metronome that my daughter could hear over the souud of the piano one that could he set for any heal. Pari I included the schematics and parts lists now let's put it together Note Figs. 1-5, Tables 1-3. and Photo A were all included in Part 1, published in April's 73. Fi . 3 remember it from last time lends itself to just...

Izv

Finders provide 2 degree accuracy, and include 1L software for Iriangulalion from ff a centrat control site. Mobile versions also available covering 50MHz to 1 GHz PO Box 2780 Carefree, AZ 85377 Tel 602 48S-9755 Fax 602 488-1295 European Market Direc tor Denis Egan TO Box 2. Seaton Devon EX 12 2YS nglafid Tel amp Fax 44 1297 62 56 90 Joe Moell P.E. KOOV R O. Box 2508 Fullerton CA 92837 Hom ngin aol.com http members aot.corn homingin Has our club held its first hidden transmitter hunt of this...

Rg

1 2H x 2 wood, 10-ft. length crossarm 4 Hose clamp to secure PVC pipe to crossarm 2 5 16' x 1 machine bolts with nuts 1 Light-duty TV rotator RS 15-1225 50 ft. Rotator cable, 3-conductor RS 15-1149 1-1 4 EMT conduit for mast, length dependent upon height 12 AWG THHN antenna wire approx. 30 ft. required for 20 m antenna Total length of antenna 12 AWG rabbit ear extensions. L 468 freq in MHz. Just above the rotator, the horizontal support is mounted to the one-inch vertical EMT conduit The...

Penny Pinchers Digital Ammeter

Because 1 do a lot of mobile ham operating, bauery usage is very important to me. During the past few years, when cruising on my boat I have often found my battery voltage becoming lower than ii should be. As a consequence, 1 have been told hy the Waterway Radio and Cruising Club net controller that I was FMing, check your batteries. The Waterway Radio and Cruising Cluh meets daily at 0745 Eastern time For about an hour and is dedicated to helping and passing traffic for marine mobile amateurs...

Modulating Signal

Ax576 Modem

R sultant bandwidth reduction with the use of a Gaussian filter The frequency at which the low-pass Gaussian filter Marts to work has a direct influence on the bandwidth used for transmission. The lower the frequency relative lo the data rate of the signal, ilie narrower the transmission spectrum, but the higher the likelihood of bit errors during transmission. The ratio of the -3 dB point of the low-pass filler Fl to the data rale is known as the BT value. This can be shown by The...

X

Piezot MuRata PKM-11 or Radio Shack 273 73 or equivalent in the house. This sound is equivalent to a smoke detector, so you shouldn't I have not been alerted h my new alarm yet. but it gives me a vace of nund thai 1 never had before. Knowing that it's there makes all the difference

Wwv Receiver

Wwv Receiver

Got lime ft frequency checks without tjuj lng multibano hf rcvr Hear solar activity reports affecting -adio propagaiicr Very sensitive and selective crystal contro ed super-het. dedicated to listening to WWV on 10 MHz. Performance rivals ihe most expensive receivers RWWV Rcvr Kit, PCB - RWWV Rcvr kit wi h rabt sp r. ft 12Vdc adapter . 69 RWWV Rcvr .v t in catil M sp r a asaptei ________ S129 Hamtronics rs pieased to announce a new line of its vhf fm transmitters and receiversr popular for...

Years Of Quality Antennas Skymaster Hf Kits From Js Pretuned Hf Quads From Sa

Quad Antennas From 2 Through 4Q Meiers 2 METER 4 EL PRE-TUNED S4 amp .9S SiH 6 METER 2 EL PRE-TUNED S69.95 54H SEST PfltCE amp O eeyBLEBHAIQtB DftCfW.N ftOPE visit our new web site http www,cubex,com Write Or Cal For Fret Cslit og 7024 Soutfwesl 21st Place. Unit D. Oavie, FL 33317 954 236-3663 FAX 95- 236-5576

Qrp

Michael Bryce WB3VGE SunLight Energy Systems 955 Manchester Avenue SW North Lawrence OH 44666 prosolar sssnet.com As the sun wan us the planet this time of year spring arrives and again the earth is renewed. It's also the time of year that marks the beeitiniiis of hamfest season And of course the biggie that starts ihe season off is Dayton's hamvenlion With luck. Ihis year will mark my 24th trip to Dayton. And if my timing scoffed, the column should hit just as the hamvenlion kicks off, Dayton...

Als

While allowing ii to complete the circuit for DC. An example of a balanced amplifier is shown in lip. 11. Tliis circuit is a variant on the theme of the Fig. 8 circuit in which the input transformer TI in Fig. 8 is replaced by the loop, Because the circuit is a common gate push-pull amplifier, ihe coupling loop must be center-tapped in order to provide balanced bui out ol phase input signals to QI Q2. As with the previous version, the DC is applied to the drain terminals of Q1 and Q2 through...

In

Mwa110 Circuit

Fig, Two MWAIIOs produce a broadband preamp, 22 73 Amateur Radio Today May 1998 Fig, Two MWAIIOs produce a broadband preamp, 22 73 Amateur Radio Today May 1998 and Vt is 2.9 V. When V is 12 V. the decoupling resistance R in Figs. 2 and 3 must drop 9.1 volts. Therefore. R must be 910 fl The amplifier shown in Fi n 3 uses 50 Q. micros trip lines at the input and output of the MWA110. The DC components are on the ground plane side of the hoard, while the RF components arc on the other side. The DC...

Ya Gotta Shop Around

Take your time, do your homework, and get the best deal Have you ever looked at a new rig. or even a picture of a new rig. so long and hard thai you almost drooled on it That's die wa I saw the COM IC-706. What a great idea tor a rig a complete design the everything transceiver. I had been using my trusty Kenwood TS-130S, which I loved, for many years. It was evervthiim I had needed . -t however I used Lhe 130 as my secondary rig at home and white camping, and sometimes ran it mobile- and it...

Brits Get Gaussian

with GMSK Data Products' high-speed packet modem Roger J. Cooke G3LDI The Old Nursery, The Drift. Swardeston, Norwich Norfolk NR14 BLQh UK m ay or uk.mdis.com GMSK Data Products is a partnership company set up by two professional electronic design engineers who arc also keen radio amateurs Matt G6WPJ and John GKSTW. They are the sysops of the TCP IP packet stations GR7WPJ and GB7STW, respectively. Mutt and John are also av id members of their local TCP IP group, the Essex IP Group or EIPG,...

Gmsk

A method of data modulation known as Gaussian Minimum Shift Keying GMSK is used lo pass data as fast as practicable in the radio channel. GMSK modulation and demodulation and the modems' control and data coding can all he performed by the latest integrated circuit devices. This makes for a compact design and lav out vvhich is easv to build and provides for high performance. Radio port speeds of 4StK . 9600. 19200, and 38400 bps with AX384 7200, 14400,28800, and 57600 bps with AX576. The...

Pill Bottle

Making Center Insulator

Fig, 3. indoor wire dipolt using a discarded pill bonle as the center insulator. Fig, 3. indoor wire dipolt using a discarded pill bonle as the center insulator. Alter struggling to remove the iin GMA-style fuse mounted on the printed circuit board of my Kenwood TS-50 after it opened, I decided to make my life a little bit easier the next lime that fuse might give out I cinched a small in Ion cable tie around the new fuse's bod gt . leaving enough 'tail' on the cable tie for me to easih crab...