hl 60u circuit

The 4X4 Slimtenna - Development of the Slim Jim antenna for HF

Ashland Amateur Radio Club - The Ashland Amateur Radio Club is located in Ashland, Nebraska on the KØASH repeater at 145.310 (-).

FORDAHL - The FORDAHL Group was founded in 1981 and quickly established itself as a leader in the area of high end miniature frequency control products.

100watts.com - Bi-monthly hams and cb radio magazine in Thailand, established in 1989.

Yaesu FT-920 Inrad CW Filter Mod - This modification allows the use of two filters. Either one or two filters in cascade may be selected

AFR Enterprises - AFR Enterprises a leading distributor of electronic components, semicondustors, diodes, Resistors, Integrated Circuits across the USA.

APRSISCE/32 - APRSISCE/32 is an Automatic Packet Reporting System (APRS) program, primarily intended for Windows and Windows Mobile (CE), although it will run on Linux and Mac OS under wine. Offer enhanced messaging, announcement support via ANSRVR, and QRU for object query support, can run as a highly configurable Digipeater

iProp - iProp is a propagation simulator based on the 90's work of the FTZ Darmstadt

Transistor PA Biasing - Here is a simple circuit that can deliver the peak base current needed for linear ssb operation

Transistor PA Biasing - Here is a simple circuit that can deliver the peak base current needed for linear ssb operation

Integrated Circuit Audio Amplifiers - Circuit designs for IC audio amplifiers by N1HFX

Recovering old NICAD and NMHI Cells - Old Nicads batteries and sometimes NMHI batteries usually end up with several cells being short circuit, as they suffer from crystal growth in the electrolyte

Semiconductors - Semiconductors, diodes and transistors, intregrated circuits

RF Dummy Load - The use of dummy load is mandatory for off-air adjustment of the transmitters. Build one.

Circuit Laws - Basic electronic circuit laws

A high perfomance Crowbar Circuit - The MC3423 can protect sensitive circuity from power supply transients or regulator failure when used with an external "Crowbar" SCR.

DC RF Sensing PA Switching - Circuit for dc/rf sensing pa switching from g8mny

QLF Filter - Microprocessor based interface designed receives a signal from a Morse key, processes it, and re-transmits it to the radio. A microprocessor in the circuit is pre-programmed with a proprietary algorithm which makes a number of measurements and adjustments to the less percise human generated code.

A low cost morse Trainer / Keyer - By Prof. T. K. Mani - VU2ITI

FT290 CW KOX Circuit - This is not actually break-in but just KOX circuit. It can only be used on the CW mode otherwise it keys up the Tx

Non-relay instant RF Switching - Coax lines to do the RF switching. The advantages are instant switching, no power wasting DC control circuits.

An Accurate Power Meter For QRP Ops - A circuit using two junkbox transistors and a garden variety op-amp that will let you accurately measure your rig\'s flea power down to milliwatts.

30 m Band Direct Conversion Receiver - The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct.

Oscilloscope Tester - Circuit to assist in the setting-up and calibration of oscilloscopes

UHF on a VHF Rig - This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.