Diode Radio Kit

how to convert a 40meter ham radio receiver into a 80 meter receiver?

how to convert a 40meter ham radio receiver into a 80 meter receiver,
I have a kit to make a 40 meter ham radio receiver, they 80 meter receiver has been discontinued, I hope there is someone who could give me a little bit help.
the kit is a 40 meter direct conversion receiver it uses a sa602 chip, two varactor diodes and two toroid ferrite coils that are hand wound.

Dear Jimjuta,

Direct conversion receiver is oldest type of receiver that designed before superheterodyne receiver system. In direct conversion, joined carrier signal and AF signal directly extracted/filted to get AF signal. While in superheterodyne system, joined carrier and AF signals, first developed to get IF (Intermediate Frequency) signal. This IF signal then amplified in order receiver to be more sensitive, then as final result: AF (Audio Frequency).

Superheterodyne developed because IF amplifier which frequency is much more low than RF, is easier to designed.

If you like to change frequency of your receiver, you should be able to modify oscillator/local oscillator of your receiver. Oscillator developed from many models: with LC tank, VCO, Crystal, etc..

Eg. oscillator with LC tank: main formula for resonance frequency: Fr=1/(2π√(LC)) . If values of L and C increased, resonance frequency would be lower. Of course if you modify oscillator, you would need oscilloscope which maximum frequency measurement is approximately 5MHz (because 80m band is between 3.5-3.9MHz).

In order to modify, you should understand internal circuit of SA602, so please download this link (just click): http://go2.wordpress.com/?id=725X1342&site=frrl.wordpress.com&url=http%3A%2F%2Ffrrl.files.wordpress.com%2F2008%2F11%2Fne602.pdf although this is datasheet for SA602A. On that datasheet, figure 7 shows various tuning circuits attached to pin 6 and 7, and figure 8 shows circuit if you are using VCO with synthesizer. I do not know what circuit you are using. SA602A could produce oscillation up to 200MHz, so modify it to 3.5-3.9MHz, I hope is alright.

I could recommend You good book to design oscillator: "Transistor Circuit Design With Experiment" by Delton T. Horn, and another good book to design coil/L/inductor: "ARRL Handbook".

Have a nice experiment.

Thank You very much Jimjuta.

Kuryakyn Diode Kit $6.76 " This kit is required when installing LED. lights as turn signals on a motorcycle with a single turn signal indicator light If this diode kit is not installed, power will back feed across the indicator light and all turn signals will ff"

Crystal Radio Kit $30.32 Kids can build a working crystal radio that will pick up radio stations with this activities kit. This crystal radio kit allows children to experiment with radio waves while learning chemistry basics.Kit containsOne diodeOne baseFour rubber bandsOne tuning rodTwo connecting wiresOne coil wireOne sand paperThree nutsOne earphoneThree boltsFour washersOne coil tubeOne tuning ball and one instruction manualNo batteries requiredMeets or exceeds ASTM F 963Dimensions: 9.1 inches high x 7 inches wide x 2.35 deepAge recommendation: 8 years and upModel: 2012

Elenco MX-901C Electronic Crystal Radio Kit $15.5 Safe solderless educational and fun!. Easy-to-read instructions included. Crystal diode converts RF to audio. Tune in your favorite AM radio stations!. Learn how radios work. Includes earphone. For ages 10 and up.

Elenco MX901C Electronic Crystal Radio Kit $20.15 Safe solderless educational and fun. Easytoread instructions included. Crystal diode converts RF to audio. Tune in your favorite AM radio stations. Learn how radios work. Includes earphone. For ages 10 and up.

Kuryakyn L.E.D. Turn Signal Diode Kit $7.99 This kit is required when installing L.E.D. lights as turn signals on a motorcycle with a single turn signal indicator light. If this Diode Kit is not installed, power will back feed across the indicator light & all turn signals will flash at once.

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Custom Dynamics Diode Kit $6.99 Use when front turn signal bulbs are replaced with LEDs Designed for metric cruisers with one LED turn signal bulb in each turn signal

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Philmore Model VC-1000 Radio Kit

Solar Power On The Go

In the early days of solar power there were huge installations necessary to make use of this energy source. The solar panels that were needed were larger than the average full grown man. This made the collection of solar power a bit of a challenge. Therefore making use of solar power was not suitable of everyone. It was expensive and a bit of a chore as well.

These huge solar panels still exist in solar power plants, which produce energy for certain parts of the world. But over the years technological advancements have made solar power affordable and portable enough so common people can use it for their everyday lives. Nowadays solar panels have become so small that pocket calculators use these as an alternative power source to the usual single cell batteries.

But the use of portable solar power did not stop with the use of pocket calculators. Numerous inventions have made use of portable solar power and some of these are available all over the world. Let's take of look at 5 affordable uses of portable solar power.

1) BRUNTON BATTJACK Batteries and Chargers

The charger comes with the SolarPort 4.4, wall transformer and 12V car cord to charge batteries from AC or in a vehicle. The charger can hold 4 AA or AAA rechargeable batteries. The kit has 4 1500 mAh NiMH AA battery cells. The charger will switch to trickle charge when the batteries are fully charged. It also has a discharge option for maintaining NiCad batteries. This will cost $30.

Batteries are NiMH AA dry cells, have a 1500 mAh capacity, can recharge for hundreds of times, and come in a package of 4 AA batteries. These cost $14.

2) SS-PVSMALL Power System

This portable solar power system from Silicon Solar Inc is easy to use and needs no assembly. Included in each system is an inverter/battery carrying case and 8.5 or 17-watt solar panel/charge.

This system can power a laptop computer, portable audio devices, small coloured TV, and most devices that need less than 140 watts AC 110-120v, and 60Hz input. Power time can range from 30 minutes to 56 hours, depending on the equipment being powered up.

The system is also used for indoor/outdoor lighting, and is lightweight. The system also includes inverters, cables, battery box, and sealed gel cell battery. The system comes with a 1-year warranty. The system costs $149.95.

3) UNI-KIT

The Uni-Kit system is a portable, durable, solar powered lighting system that can provide extended lighting hours to its users. This is powerful enough to let even a 12-volt radio or TV operate, and easy to install. The Uni-Kit system also comes with a basic power controller that maximizes battery life of its 12-Volt Deep Cycle SLA Battery by controlling its charging and load use, and protects the system from overcharging and excessive discharging.
Uni-Kit can be used in the garage, tool sheds, remote homes, isolated buildings, surveying sites, construction sites, camp sites, and even during water pumping operations.
Uni-Kit comes with an 11-watt fluorescent lamp that has a 1-year warranty. The 15-watt solar panel has a 20 year warranty. You can add up to 4 lamps to increase the system's illumination capacity. The default kit weighs 10 pounds and can be purchased for $249.95 from Silicon Solar Inc. If you have additional 4 lamps, all 4 will cost an extra $235.

4) BRUNTON Portable Solar Panels

Brunton has portable CIGS (copper indium gallium diselenide) solar array panels that are thin and lightweight to save weight for backpackers. These panels produce standard 12volts outputs, and come with basic 12V vehicle socket, 4 different jack plugs, and battery clips. Solar array panels come in a 6 and 12 foldable, and 14 roll able series. Prices of these panels range from $129 to $399.

5) EN-R-PAK AC/DC Backup Power Supply

The EN-R-PAK backup power supply 200 series are compact solar power backup supplies that have built-in electronics that store, control, and produce energy from the sun, wind, or flowing water. The system can accept additional solar panels, wind turbines, or water turbines. These power supply systems use renewable stored energy to produce 115 volts and 12 volts DC. A 230-volt unit is also available for international use.

The EN-R-PAK can provide emergency power for a home or office, remote areas, a cabin or cottage, for communications, wherever and whenever you need power! This system has no parts that wear out, is environment friendly, quiet, does not emit harmful fumes, easy to operate, requires no assembly, needs almost no maintenance, and is designed to survive rugged weather conditions. These can also power energy efficient lights, a laptop computer, a small TV, rechargeable power tools, and other electrical equipment.

The EN-R-PAK has a 1-year system warranty, 20-year solar panel warranty, 2-year battery warranty, and is built to conform to UL, NEC, and CSA electrical standards.

EN-R-PAK 50-watt solar panels are liquid-proof and shatter proof. These also come with a blocking diode, 30 feet of cable with a connection plug. Wind turbines are also configured to the EN-R-PAK so changes to the power centre are not needed.

The basic system will cost $1500. Additions to the system will make the cost reach a maximum of $2950.

This sums up the possibilities for portable solar power. As time and knowledge progress other devices and possibilities will be available on the market. The prices mentioned here can give you an idea, but are by no means accurate.

About the Author

Bryan Wong is the owner of the solar information website

www.GetEasyInfo.com/solarpower> - A great website that shares quality Info, News and TIPS on solar energy.