Degrees Below Horizontal

Fig 2 A plot of an antenna's relative field strength v degrees below horizontal provides an accurate method of calculating the antenna's coverage pattern. (Graphic courtesy of Bogner Broadcast Equip Corp) This technique can be used to increase the signal strength within a system's allotted coverage area (or cell in cellular radio applications) without increasing the size of the coverage area or radiation levels towards neighboring systems or cells). It can also be used to reduce signal levels...

Circuit Board

Fig 3 Solder should flow out in a smooth fillet between the circuit metal and the chip-cap end termination. of oxidation. Tarnished or oxidized contacts won't accept solder no matter how hot you get them. Avoid handling the chip with your fingers because finger oil can impede the flow of solder. First, tin the circuit areas where the chip is to be attached. Use tweezers to place the chip in position. Hold it in place with the tip of the tweezers while you solder one end. Use a narrowtip...

Other Radios And Accessories

Panasonic RF-2600-EA Shortwave receiver 179.95 RD95-EA Uniden Remote mount Radar Detector 128.95 RD55-EA Uniden Visor mount Radar Detector . 96.95 RD9-EA Uniden Passport size Radar Detector, 239.95 BC-WA-EA Bearcat Weather Alert 49 95 0X1OOO-EA Bearcat shortwave receiver SALE 349.95 PC22-EA Uniden remote mount CB transceiver____ 99.95 PC55-EA Uniden mobile mount CB transceiver 59.95 R1060-EA Regency 10 channel scanner SALE 92.95 MX3000-EA Regency 30 channel scanner 198.95 XL156-EA Regency 10...

Opamp Projects

Includes a Slide Timer AF Signal Gen Mike Pre-amp. Scratch Filter, and much more BP67 COUNTER DRIVER & NUMERICAL DISPLAY PROJECTS 5.00. Numerical indicator devices make H easy to count, divide and display ( I BP59 SECOND BOOK FOR CMOS IC PROJECTS 5 00 Multivibrators, amplifiers triggers & gates, special devices including reac tion timer simple electronic organ, and more ' BP93 ELECTRONIC TIMER PROJECTS 5.00 Timing circuits to III usl about every application Required tor every...

Protocol

Fig 6 An ICOM-to-Kenwood interface. to determine whether originate (closed) or answer tones (open) are used. When S2 is open, the 202 mode is selected. In the 202 mode, S1 is used to enable disable frequency equalization. I haven't determined that this makes much of a difference, so I leave S1 on this switch position turns off the equalization. The output interface drives an ICOM IC-2AT type radio. I use a Kenwood TH-21AT for my main radio, delegating my IC-2AT to packet work. Since I normally...

Nemal

12240 N.E. 14th AVENUE, NORTH MIAMI, FL 33161 TELEPHONE (305) 893-3924 TELEX 6975377 dealer pricing available on all items QEX (ISSN 0886-8093) is published monthly by the American Radio Relay League, Newington, CT USA. QEX (ISSN 0886-8093) is published monthly by the American Radio Relay League, Newington, CT USA. Maureen Thompson, KA1DYZ Assistant Editor William Conwell, K2PO Geoffrey H Krauss, WA2GFP Bill Olson, W3HQT Contributing Editors Lisa Fuini QEX Circulation Michelle Chrisjohn, WB1ENT...

Interface Board

Fig 3 The 16-pin connector cable is wired from the Xerox at point J8 to the interface board. The ground wires must be added because Xerox omitted them. What we have here are three BCD digits, four binary lines each. When a line is tied high 5 V , that line is selected. The first BCD digit is MHz, the second is hundreds of kHz and the third is tens of kHz. While you are inside the transceiver, connect the squelch mute line wire 13 , ground wire 14 , and the 5-kHz line wire 15 to the 16-pin...

Scanners

Old Regency Programmable Vhf Transceiver

The world's largest distributor of radio scanners, Introduces new lower prices to celebrate our 15th anniversary. List price 89S.95 CE price S390.95 SPECSAL 10-Band, 30 Channel Grystallmts AC DC Frequency range 25-550 MHz. continuouscovgrage and S00 MHz. io 1.3 GHz. continuous coverage. The Regency MX7000 scanner lets you monitor Military, Space Satellites, Government, Railroad, Justice Department, State Department, Fish amp Game, Immigration, Marine, Police and Fire Departments, Broadcast...

Function Generator Kit H To Khz In Five Bands Amplitude And Offset Adjustable Output Imp Ohms Wave Forms Sine Square

SHIPPING INFORMATION PLEASE INCLUDE 10 OF ORDER FOR SHIPPING AND HANDLING CHARGES MINIMUM 2 50 MAXIMUM 10 CANADIAN ORDERS. ADD 7 50 IN US FUNDS MICHIGAN RESIDENTS ADD 4 SALES TAX FOR FREE FLYER SEND 22 STAMP OR SASE 12671 Dix-Toledo Hwy. C gt Southgate. Ml 48195 r -T 7L 313 281-7773 Hours 12 00 - 6 00 EST Mon.-Sat , gt t lt HAROLD C NOWLAND

The Arrl Handbook

1186 pages and 40 chapters make this the most comprehensive edition since the Handbook was first published in 1926. It is updated yearly to present the cutting edge of rf communication techniques while presenting hundreds of projects the average Amateur Radio operator can build. Paper 0631 18 US, 19 elsewhere. Cloth 1638 27 US, 29 elsewhere The 63rd edition is packed with information on digital communication modes as well as new power supplies, amplifiers, and a digital PEP Wattmeter....

Cathode Current Shunt

Fig 2 This circuit represents a commercial VHF class-C grounded-grid amplifier using a 3CX1500A7 8877 tube. In rny January 1986 column, I discussed bias circuitry for triode grounded-grid amplifiers, particularly those using higher-frequency types like the 2C39, 3CX100A5 and the 7289. As a result of that column, I received several letters detailing circuits being used by other VHF ers. Two of the cathode bias circuits are discussed here. The first circuit is shown in Fig 1 and was described to...

The Best Gets Better At

The Most Exotic VHF-UHF Receiver Ever Offered To General Public EEB introduces the new ICOM R7000 VHF UHF receiver, which also is available as the R7000 HP high performance with EEB-designed modifications that remarkably improve the sensitivity, audio frequency response, selectivity, and more In conformance with their record as a responsible manufacturer, ICOM has done everything possible to hold down production costs wnile modification e.g.. R71A that can substantially improve performance and...