Ps

9- 5 V variable 30A Wa* 22A cominuous Overload protected multiple terminals s-See Lisr of Advertisers or page 30 In this case, let s use the reliable LM324. 5fep 2. Select a circuit. We can start with the SVF of i ig 2 and later see what happens when we convert the design to the other circuits. Step J. Choose a power supply, in this example, we have chosen a single 12-volt source. This forres us to provide a voltage divider to teed the positive input lines that we would directly ground it we...

Call Toll Free For Quotes

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Q

Fig. 6, Norton amplifier configuration only R6 R5 2Rf rig. 5. A comparison of filter design relationships. or vary somewhat from their value according to the needs of the Q relationship Only in the SVF design does Q leave the input resistor unaffected, being determined by the relationship between R4 and R5. In the other designs, the input resistor will be a compromise (if needed) between the dictates of Q and the desired situation of having the input resistor correctly related to the feedback...

Inpjt

CMOS inverter, showing inputs and outputs. authorities quote not less than 1 megohm, with some going to 10Ti Ohms, Thus, many CMOS devices can be driven from the same output with regard for current-driven capability, There may, however, be capacitance limitations, especially where a rapid rise time must be maintained. Fig. 2 illustrates some of the circuit situations required to interface between CMOS and TTL devices. Ordinarily, a single low-power (74L) or low-power Schottky (74LS)...

Kantronics Sets A New Standard With The Kantronics Universal Terminal Unit

UTU allows any computer with an RS232 port and a terminal program to interface with any transceiver. Additional software isn't necessary with UTU, as an internal microcomputer gives the unit data processing capabilities to send and receive in four codrd amateur formats Morse code, Sample terminal programs for IBM, TRS-80 Model III and IV, Kaypro, and other computers are included in the manual Enhanced features can be user defined by altering the terminal program, giving you flexibility to...

Info

New MFJ-1224 RTTY A5C11 AMTOR CW Computer Interlace lets you use your personal computer as a computerized full featured RTTY ASCII AMTOR CW station for sending and receiving. Plugs between rig and VIC-20. Apple. TRS-B0C. Atari, TI-99 Commodore 64 and most otters Use MFJ see MFJ-1250 1251 Mow) software for VIC-20. Commodore 64 and Kantronics for Apple. TRS-80C Aiari, TI-99 and most other software for RTTY ASCli AMTOR CW. Easy, positive tuning with twin LED Indicators. Copy arty shift 170,425,960...

Australia

Jim Joyce VK3YJ 44 Wren Street Attona 30W, Victoria Australia it has been claimeJ that no two nation's prople are more alike all ways than Aus traJ ans and New zanders, Considering our comnwo heritage, It Is not surprising mat there moves iq the Fate 1900s to make New Zealand another state of Australia, but the plans were eventually dropped With New Zealand being closer to the eastern states of Australia than our own West Australian city of Perth and with, up until lately, no I ravel...

Mark Cr

In 1978 we created the first microprocessor based repeater and here is its successor the incomparable MARK 4CR. Of course it has autodial and tail messages, after all, we invented those features, Sure it has autopatch, reverse patch and built-in ID. But hold on - it also has Message Master1 real speech and receiver voting. Its all new receiver puts 7 large helical resonators up front for extremely high dynamic range. Yes, MARK 4CR is the next generation Unlimited vocabulary speech messages in...

Grounding Contact

The approximate method of fabricating the double-sided printed circuit board base and shielding of the preamp. The shields are covered with copper foil ids that are soldered to the edges of the shield enclosures. The drawing also shows the mechanical details of the switching contacts. A 4CX250 amplifier that provided around 300 Watts output in linear or Class C had been around for a w hile and this enabled occasional contacts in the range of 150-200 miles. Before anyone scoffs at the...

Radio X

How to get top dollar, omnidirectional performa* nee. lightning protection and economy on 2 meters Butternut's 2-MCV -5 Super Trombone with patented phasing sections, an unbroken 15.75 ft, all 0.C, grounded radiator , pre-set gamma match, stainless steet hardware and many other features. For more information, contact your dealer or write for our free catalog.

Notch

(COM is proud to announce the most advanced amateur transceiver in communications history. Based on ICOM's proven high technology and wide dynamic range HF receiver designs, the iC-751 is a competition grade ham receiver, a 100KHi to 30MHz continuous tuning general coverage receiver, and a full featured alii mode solid-stale ham band fransmifter, that covers all the new WAifC bands. And with the optional internal AC power supply, it becomes one compact, portable field day package. Receiver....

Try an

INC was the first company to introduce a single chip microcomputer-based product (the AD-1 Auto Dialer) to the consumer market back in 1977. Since that time. AEA has developed a reputation for engineering design excellence (in both hardware and software), high manufacturing quality, outstanding customer service and prices that are competitive with products providing much ess value if you hav* never owned an AEA product ask others who have ant1 you will find a...

New Hamtronics Catalog

Inc., has announced publication of their new 1964 mailorder catalog tor the VHFflJHF QSCAR enihuiiasi and twoway radio shops The 36-page two color catalog features many new products, including an expanded line of FM repealers and accessories such as power amplifiers, DTMF lone decoder controllers, and auto patches Also included are the lines of FM and AM receivers, FM transmitters, VHF and UHF transmitting and receiving con-vertex space-shuttle receivers. BOO-MHi scanner conveners...

Multiband Antennas

7131 DWENSMDUTH AVE., 463C CANOCA PARK, CALIF., 91303 TELEPHONE 316 341-5460 International's leadership in crystal design and production is synonymous with quality quartz crystals from 70 KHz to 200 M Hz. Accurately controlled calibration and a long list of tests are made on the finished crystal prior to shipment. That is why we guarantee International crystals against defects, material and workmanship for an unlimited time when used in equipment for Orders may be piaced by Phone 405 236-3741,...

General Information

513 223-0923 Try to limit calls to between 8 am and 10 pm EST. Prices Registration general admission ticket is 7.50 in advance and S10.00 at the door. Tickets on sate in advance by mail or at the arena during the regular Hamvention hours not available overnight as in the pastl Asst. General Chairman Harold HaP Judd WA8KNM Apri 28 Banquet Speaker Harry Dannals, Past President, the Amateur Radio Relay League. Banquet tickets 14.00 in advance, Si6.00 at the door. Flea-Market Setup Times...

Hal

AT-3K 1 S 30 MHz. 3 KW PEP SWR bridge with separate fWD amp RE 1 meters. Tunes toa i rres or balanced line Hh optional balun 4 I2d 13 d Receive-on Baudol ASCN CW comurucations te m nal With optional KB-2100 Keyboard, and a Video Monitor it's a complete transmit and receive terminal Option gt ifit vn with CT-2100 Regular SALE KB 2100 Dedicated keyboard 175.00 M911 RS-2100 1 RTTY scop loop supply 329.00289 KG I2N 12 green screen monitor 200.00 169s RW 2100 Rack mourning kit i 25.00 Service Manual...

Output

Fig. 2. 5-voll-input versiont Note thaf L2 s phase is reversedI Equi alent transistor types again The 79172 only bums about 4 mA. enough gain at the frequency in use. The added pair corrected that but brought in a new problem The saturation voltage VcE-sar f r a Darlington pair, measured from the ganged collectors to the lower emitter, is one typical circuit, because the driver-half emitter is held high by the final-half baseemitter diode one VBE , and their collectors are tied together The...

Strange Openings From Upland

I grew up in Lapland, northern Sweden, lust north of the Arctic Circle which is the call area SM2_ My OTH was located further north than Fairbanks in Alaska which might be of some reference help to you. In the wintertime From yp there f usually could work the west coast of the North American continent at night. VE8. VE7l KL7, W7l and all the way down to W6 was fane, ot course, still is workable, the signals crossing the North Pole are characterized by a very rapid flutter In those operas you...

Johnson Tube Sockets And Chimneys

SFOR 520.00 260.00 74.00 36,00 390,00 51,00 73.00 11.00 60.00 60,00 66. 00 10-00 66. 00 34,00 36.00 7 i 00 225.00 225-00 86.00 86.00 225,00 40.00 225.00 300,00 57,00 650.00 535.00 12 -L11 SK606 122-0275-001 124-0113-00 124-I16 SK630A 124-115-2 SK620A Chimney For 4CX250B,BC,F 4CX350ABF,FJ Socktt For 3-500Z, 4-125A, 250A. 400A, A-30 A, 5-500A Socket For 4CX250BtBC FGtE, 4CX350A, F ,FJ Socket For 4CX250B,HC,FCTR, 4CX35QAjF,FJ 813 Tube Socket

Preamps

Call or Write for FREE CATALOG Send 1.00 or 4 IRC'c for overseas mailing Order by phone or mail Add S3 S amp H per order Electronic answering service evenings amp weekends Use VISA, MASTERCARD, Check, or UPS COD, Hamtronics is a registered trademark For SSB, CW, ATV, FM, etc. Why pay big bucks for a rnulti mode rig for each band Can be linked with receive converters fortransceive. 2 Watts output vhf, 1 Watt uhf. New low-noise microwave transistors make preamps in the 0.9 to 1.0 dB noise figure...

Kantronics Universal Terminal Unit

UTU allows any computer with an KS232 port and a terminal program to interface with any transceiver. Additional software isn't necessary with UTU as an internal microcomputer gives the unit data processing capabilities to send and receive in four coded amateur formats Morse code, Radioteletype, ASCII, and AMTOR. Sample terminal programs for IBM, TRS-80 Model IN and IVf Kaypro. and other computers are included in the manual, Enhanced features can be user defined by altering the terminal program,...

Rtty Today

Radio Amateur 1984

In a large 81 r k 1V softbound edition with an easy-to'ead type style and format, the books Eleven chapters cover The Ex citing World of -mateuf FTTTY, Operating Parameters and Concepts of RTTY Straight Tai K on Home Computers and RTTY, RTTY Syvems for Home Computers RTTY Converts You Can Build, Dedicate RTTY Terminals and Systems. New Mini-RTTY Systems, Fascinating RTTY Ouiside the Amaieur Bands Press, Military, Weather. Etc , Fluency list o Comrner-ciar Press Services. Secrecy and Othe Codes...

Macc

Surge protected Master AC Control Console Provides eight outlets and features lighted switches for individual circuits 3rd master single-switch station control. Model MACC Master AC Control Console S79.95 125 VAC. 15 A 1875 warts tofta rating. Rugged 3-stage 2000 A lightning clipper, tested to IEEE pulse standares it OL r i-ptiaDetta er Cr cmjer t iTevt in U.S. UasterCaro ano VISA accepts it OL r i-ptiaDetta er Cr cmjer t iTevt in U.S. UasterCaro ano VISA accepts P SOf Cements Or c 45459 - lt...

Daiwa

GIVE YOUR HAND-HELD THE BOOST IT NEEDS The New Daiwa LA-2035 two meter linear amplifier. A compact amp at a compact price Only 79.95 Suggested Retail, This amplifier us designed for use with hand-held transceivers in either mobile or fixed station configurations. Because of its light weigfrt arid compart silr. tlw tA 2 35 can bt mounted under the da amp it. under du- seat, or in any other concernent The LA-2035 is equipped with Rl activated stand by circuitry. Easy operation. S imply connect...

Wyomingutah Ranch Land

FREE infer-mation. maps, photographs. Trade equity tor ham gear, home computer, test equipment, etc. Owner Mike Gauthier K6ICS, 9550 B Gallatin Fid. Downey CA 90240. BNB001 MOBILE IGNITION SHIELDING. Free literature Estes Engineering, 930 Marine Drive, Port Angeies WA 98362. BNB006 COMPUTER OWNERS Super new MFJ 1224 CW RTTY ASCIf terminal units. Sen deceive GW RTTYJVlC-20 and Commodore 64 software. Full-featured, disk or cassette. Kantronics, too. Low prices, speedy...