Clamps

ASHING UNE 5 T fl B L 2 E Ff S The LC4fLQ antenna mounted above the tribander. The LC4fLQ antenna mounted above the tribander. Hg. 3 feedpoints tor horizontal and vertical polarization. hook around the bolt or screw, and then cut the entire piece off. In making the swr measurements, I noticed that the relative motion between the elements was enough to change the swi To prevent this I added three pieces of fishing line tied to each element and to the ends of the boom which extend beyond the...

O

A no frills directory of over 411,000 U.S. Radio Amateurs. 8Vzx11, easy to read formal. Completely updated. Also available tor the first time ever Alphabetically arranged- Said separately) by STate. C< 1y and Siree Mo and Coil Ordering information Directory SH. 95 Geographical Index 2S< 00 Name Index 25.00 Send your order-enclosing cneck or money order in U S dollars to 7(M Florida Hill Road Kid eheld, CT tX> 877 U.S.A. on 2 Meter Handheids with this MFJ VHF Converter. New MFJ VHf...

New Rtty Books

WORLD WIDE RADIO TELETYPE STATIONS IN FREQUENCY OROER 8th EDlTtON Compiled by Univer sal Electronics Inc. Contains 2198 frequencies of sta 1'Ons that h we been logged m 1982 Frequency Sign, name of station TU countrT symbol, nmes of reception and details are included Ail Types of RTTY stations are lisied including schedules of 82 press and news agencies operating on 637 Irequendtes. Includes 77 meteorological stations on 279 frequencies Covers jl' RTTY stations from 3 MHZ to 30 MHZ. air metro,...

Encom Photovoltaics

Distributors nf Sotarex PhotovoiUttcs Di iL 73 75B4 Schoolcraft Liviini, , Mi 48lb0 See List of Advertisers on page 114 73 Magazine * May 1963 53 William Tucker W4FXL 1965 Sou til Ocean Dn o Apartmeni 15-C Hallandale Ft 33009 If you are a coffee drinker and you work 2 meters, you'll love this antenna. W4FXE shows you how to get wide bandwidths and small size at low cost Recently, I needed an in__door antenna for two- meter FM operation to piace on the wmdowsill of my high-rise apartment. The A...

Antenna

Fig. fl, Test setup for tuning the coffee-can antenna. It may be only 70 feet up, but this aerial is no worm-burner Better still, it will fit almost anywherel The loop antenna *s well known, with many van ations incltjding the quad loop, the delta loop, and the twin loop Loops have a reputation of being easily tuned, forgiving of slight mismatch, broad banded, balanced, and immune to QRN Many antennas are really loops m disguise if you don't believe it, consider such diverse examples as the...

WIRED

Here'i a hanjy. general purpose counter thai provided mnn counter functions at an unbelievable pnce The MINI-100 doesn't have tbe fu41 frequence range or input impedance quaJiDes found in higher pru e unjli but for basic RF signal measurement, it can be beat Accurate meuuremcnL can be made from I MHz nil the way Upto5G0 MHz WftfleKceUftflt sensitivity throughout the range, acid the two ale timei let you selcct the resolution desired Add the its c ad pact option and ihc MINI l00mal(t*& ni<...

Great Britain

Amateurs in G at Britain are enioying the recently-released GO ftp Cud O reus Handbook e ted by G-QRP club presideni Rev. George Dobbs G3RJV The Hantfttoo* ha Over TOO pages of QRF circuits compiled from Sprat, the club's newsletter Eight years of circuits and ideas, from 1974 19B2, have been incfuded In the book. Newcomers and oftMuners alike have bean finding usefu1 new, circuits, as more British hams are discovering QRP Amaieurs interested n finding out more aooul iriis collection oi QRP...

The Interface

Software Available for Six Computers The versatility of the personal computer gives you a whole new world with the Kantronics Interface and Hamsoft or Hamtext. The Interface* connects to any of six popular computers with Hamsoft or Ham-text giving you the ability to send and receive CW RTTY ASCll. An active filter and ten segment LED bargraph make tuning fast and easy. All programs, except Apple, are on program boards that plug directly into the computer. 10 Message Ports-255 Characters each...

The Autek Research Of A Filter

Although many active filter designs pass themselves off as multi mode filters, as being equally useful on phone as on CW. very few end up seeing much use in the shack of a dedicated phone -lor. One of ihe faw exceptions to mis rufe is the Autek Research QF-1A rifter. The Aute* filler is an active audio filter combining aeveraJ functions into one package for use in a variety of signal situ-aliens The 1wo*chip fitter with built-in LM360 amplifier is capable ol driving either a speaker or...

Hessage Saved No More Mesages

An ustraf on o how messages may e inspected jnd, if garbage, deleted to con-serve c sA space. Th s feature is available only on the I oca I terminal, not over ihe air he system, one gets on fre- uency and sends a mark one tor about five setonds allowed by a bunt h of Vs. t will automatically switch o either jO wpm Baudot or 10 baud SC I depending in what the computer hears m frequent y > fter the sta-ion tr mg to che< k in drops its carrier (the is on meters), the computer will end...

Info

need an assembly mjnuai Tor the Heath HM-1Q2 HF -rfattme efiswr bridge I will pay fQf copying costs. 1rs Lind rm*n PO Box 229 Commack NV 117 am interested in forming an intercollegiate HF net foi raffic, technical formation c change, or other purposes. Any < S0l-lege radio clubs InlereSted in joining, please contact mo for Information Timothy O'Nflitl KA2MNQ Polytechnic Institute of New Yoifc Amateur Radio Club 333 Jay St, Bo* 662 Brooklyn NV 11201 1 have a Roto Beam rotator made by Gor don...

Mfj

Up lo 3 KW PEP and it matches any feedNne, 1.6 30 MHz, coax, balanced or random. to amp RF ammeter assures max. power at mm SWR SWWWaiimeterr tor Vrel 2000 200W IS position dual inductor, ceramic switch 7 pes. ant switch 250 pi 6KV cap 5x14x14 300 watt dummy lottl 4 1 teraile balun. 3 H0RE 3 KW MODELS MFJ 981, 239.95 (f 10)P Itke 984 less ant switch, ammeter. MFJ 982. 239.95 ( + 10 , like 984 less am meter, SWR Waitmeter MFJ 480, 209.95 t + 10), like 982 Jess an I switch Rexibte antenna switch...

Mpt

Message processing Is now available for radio communications systems. The MPT3100 is a complete up-date of the popular HAL DS3100 RTTY terminal, adding the ability to store RTTY messages, edit them, and retransmit them singly or In preset groups. ALL of the previous features of the DS3100 and MSO31O0 are retained and new mailbox commands are included. The editor may be used with any file that is stored. The MPT3100 includes ASR Auto Send-Receive , MSO Message Storage Option - mailbox , and TRO...

Yiu

Nal audio circuit more on this later , Let's get to the heavy stuff making the comparator switch states. The output of the comparator will be in one of two states 0 volts and Vcc approximately . If you prefer to think in logjc, 0 0 volts and 1 Vct. The output of my Icom 720A pin 8 was 5 volts on 7 0 MHz and 4 vo ts on 14 0 MHz. A note here It you refer to the pattern of changes given in the first paragraph of this article, you will see that it is arranged in order of the output voltage, not the...

Kwz

M Oi IflACMSSA f -5 fOui Ct OtCE t DDptun i. flr ii - l-l fjBACKISSUE 10 TOuPCHOlCt 'Mh MBACftiSSUE JS foun CHOICE J1 5 n HACH. SSU - Ou CHOf E SfV i4 gt in CLJR. OUIICJ UNt MNAS B J AHNO 1ATEC BASIC V 1. 044 r i 1 jmi col gt i- 'ape 4 wpm 1,1 Ml J CODE tape r i h WPlw COW fiP i FDUHA OVt I' rt ttfc JIt THf COUPlfTG SHOnrWl BFI II 0 COMPutT R 0 MES i.' yrtIJM V FWtrtiftG OU AI- ATSWAWTEO lt flft'JJl A GUIDE TOHIM RAPtO 1 I BM - Hoeev COUP lt jrE4s ARE HEME 1 j i t. Mi H r, TO M gt TOtjflSELr JH...

Philips Oscilloscope

Model PM3232 SOLID STATE Triggered Dual Beam BANDWIDTH 0-l0 MHZ SENSITIVITY 2mV to 50mWcm 0.1V to l0V cm SWEEP RANGE 0.2us to 50us 0.1ms to 50ms O.isec to 0.5 sec. 10 selections for sweep A B Beam selector switches 8cm x 10cm CRT Display PORTABLE MODEL 499.99 each LAB MODEL 309 99 each Pencil type Soldering Iren 30watts 11Ovac Model 50B100 4.29 Computer 2400m fd 30000m fd 22000m fd 2i00mfd 26000m fd 900m td laOOmfd 6200m fd 10000m fd Amphenol 323-11506-3 26vdc coll SP4T BNC connectors 59.99 RF...