hl 60u circuit

Horizontal Loop for 80 meters - Modelling an horizontal Loop antenna at 3.5 MHz

Z-Match Antenna Tuner project - This Z-Match is a link coupled all-band tuner. Two all band tank circuits cover 3-14mhz and 14-30mhz. The tank output links are selected with a very heavy duty SPDT rotary switch.

HF Digital Contest Calendar - IK6ZDE Monthly Digital Contest Calendar

Las Vegas Rural Nevada Highway Patrol - Live feed for NHP rural areas of Moapa Laughlin Primm Alamo Indian Springs

Variacs - Variable Autotransformer - Use these Variac auto transformers for specific application requirements that include, but are not limited to, home coffee roasting, tube amps, and more.

APRS in Deutschland - APRS-DE operating APRS in Germany

GB3HI Repeater - Isle of Mull, Highlands and Islands Repeater Scotland

AMSAT Deutschland - AMSAT-DL International Satellites for Communication, Science and Education.

NOAA Solar Calculators - Improved Solar Calculator, Old Sunrise/Sunset and Solar Noon Calculator, Solar Position Calculator

Adding 160 meters to the Heathkit SB-220 - There will be radical changes to this Heathlit SB-220. There will be the addition of 160 meters along with many other circuit and design changes.

SB-220 Repairs and Modifications - Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers

GG Graphics - QSL card printer based in Bethlehem, PA offer QSL Card printing, Bronze Plaque with sation ID and Printed Envelopes

Hire Test Equipment - Inlec are a leading test equipment hire supplier. Hire test equipment at low prices

4-1000A Tube RF Amplifier - Home Brew a 4-1000A RF power amplifier project by W4NFR

GS-35B Tube Amp - 160-10 Meters 1500 Watt Amp - W4NFR

Design Guidelines for JFET Audio Preamplifier Circuits - Design Guidelines for JFET Audio Preamplifier Circuits By Mike Martell N1HFX

Adjustable Regulated Battery Charger - This battery charger circuit is regulated and adjustable to make this circuit able to charge the mosto NiCAD battery.

A NiCAD Battery Charger - A NiCAD Battery Charger with Current and Voltage Limiting

Noise Bridge Tuner Tuner - Noise bridge circuit to tune your tuner

About Cavity Filters - Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass

RF Sampler - This circuit will let you look at the signal and frequency output of your transceiver.

Circuit Improvements for the TS-440S - Some improvements for the Kenwood TS-440S, including distortion level in SSB in transmitted signals, Lack of crispness in the RX audio and Limited transmit frequency coverage.

Grip Dip Oscillator - Originally eveloped by I1FLC, uses seven plug in coils covering 3.0 to 30Mhz in a Colpitts oscillator circuit.

Build a Test Meter - This article include a circuit that allows a cheap 0-1mA meter to be used as a micro-ammeter or a milli-voltmeter

RF Probe circuit - This RF probe circuit allows RF to be measured in the presence of DC