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Tune

Figure 1. Circuit diagram of Dave Benson's RIT

Tune

"XX-40" PC Board

Tx Key

Rx Key

Figure 1. Circuit diagram of Dave Benson's RIT

Photo A H&re ~ts AHGCFs v&rsfon of Dave's transc&tver Note the mufti-tum dial for tuning.

Building a circuit requiring a negative supply? Really want to use an audio filter but the op-amps need a separate minus supply? Wellt start laying out the circuit board because Linear Technology has a new CMOS voltage converter in a simple 8-pin dip IC, It's the LTC660.

This guy wili source up to 100 mA while boosting a power conversion efficiency of 88% with a 100-mA toad. It's simple to use. There's only two external capacitors needed. Most of the Linear Technology chips are in stock from Digi-Key electronics. Ask for one of their catalogs.

Good Books

Since the days are growing shorter, now is the time to get that old HW-8 up and running. I have a pile of the HW-8 Hand^ books left. They contain modifications for the HW-8, HW-9, and a few mods for the HW-7. They're only $11 and that includes first class postage.

If the bands are dead this coming winter, then how about curling up with a good book? You can get a complete set of the ORPP published by the NorCal QRP

club. This is great reading even if you1 re like Scott NSJSK who has no idea what end of the soldering iron gets r ot.

Drop a card (with postage, please) to Doug Hendricks, KI6DS, 862 Frank Ave, Dos Paios, CA 93620, Doug has put together all the issues of ORPP into one huge book. This book wlN surely generate some all-

night building binges! The price is $15.

Figuring Your Solar Needs

Most QRPers like to operate their stations on solar power. How many panels and how many batteries will it take? instead of number crunching by hand, let your Macintosh do the work for you. II have coded a HyperCard stack that wili calculate the number of solar panels,, the amount of batteries required, and lell you the minimum array-to-load ratio. Why, I even figured out how to generate charts for the various reports. SunCad Lite has an extensive database of all current and out-of-production solar modules. There's also a rather busy database of lead-acid batteries to choose from. There is solar isolation data for all states (some are not active yet) as well. Bui. best of alE, tfs free! SunCad Lite requires HyperCard 2+2 and at least four Megs of RAM, If you don't have HyperCard 2.2, then ask for the stand-alone application (hat does not require HyperCard, Just send a Macintosh-formatted blank disk with return postage to my address. State if you want the stack or the stand-aione version. I'll send it right out to you, SunCad Lite is great fun for playing hiwhat rfs,L by changing modu/es or modifying your loads.

Next month, we1lE look at some simple circuits to improve your low power equipment. In the mean time, everyone have a great Thanksgiving! EQ

210 Utica Street Tonawanda, NY 14150 (716) 692-5451

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Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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