battery tips

A 5/8 mobile whip for 2m - Schematic for a a 2m 5/8 λ mobile whip, courtesy WB4MYL

Ground Plane Antenna for 70 cm - It is easy to homebrew this quarter wave ground plane antenna for 70cm.

Ground Plane for 70 cm - A quarter wave ground plane for 70 cm

8 elements Yagi for 70 cm - 70 cms 8-element Yagi Beam, this Yagi antenna should not need a balun as it will resonate under its own merit.

1:6 Balun for the HF bands - 11 wdg bifilar on Amidon T 200-2 Toroid core

W0BTU Beverage Receiving Antenna notes - Comprehensive information page about bi-directional Beverages, including applications, construction details, and tips.

Low-Cost dipole for QRP - Here’s an economical dipole for simple QRP HF homebrew rigs.

Low-cost half wave Dipole for HF QRP rigs - An economical dipole for simple QRP HF homebrew rigs

Coiled Coax Choke Balun - A very practical Balun for aerial work is the choke type

Building tips - Homebrewing antennas with parts which you can buy from local shops and stores.

A homebrew magnetic antenna mount - A homebrew Magmount for 2m antenna

PSK31 Fundamentals and Setup - Background: The PSK31 philosophy, The QPSK mode, Varicode, Sound Card DSP Setup and Operating Tips

An introduction to HF Propagation - This article will help to unravel some of the mysteries as well as giving useful operating tips to maximize your chances of working that rare station by G4UCJ

Fox Hunt Attenuator - An Offset Attenuator for fox hunts.

Rechargeable Battery Review - Rechargeable Battery Comparisons

Battery voltage booster - A battery voltage booster project with pictures and schematic by KD7W

Battery Articles - A collection of battery questions and the replys from Red Scholefield, a battery engineer.

Rechargable Battery Information - All you need to know to keep your batteries fit and well!

Change Battery on DVS-2 - The DVS-2 is a CQ unit for the Yaesu Trancievers.

Fast, smart NiCD/NiMh battery charger - PCB for a battery charger described in the datasheet for the MAX712/MAX713 fast charge controllers.

NiCad battery charger plan - SV1BSX project for a Nicad battery charger

40 meters QRP CW RTX Priority listing - This is the schematic of asolid-state 7 MHz QRP CW transmitter by VU2NAN

Radio Modification Information Center - Tips, tricks, and modifications of Ham rigs, Ham modems, and more equipment.

A Guide to Better Soldering - Basic guide on soldering techniques, tips and tricks

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.