pmr circuit diagram

Ferite Balus 1.8 - 30 Mhz - 1:1 and 4:1 baluns diagrams

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.

PortalPMR - Spanish Transceiver forum with classifieds

Funk-Forum - PMR forum, in German

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.

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

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

CAT5e Wiring Diagram - CAT5 T-568B Colour Code for RJ-45 Plug

TVI Filters - Schematic and diagrams for TVI Filters by G4WPW

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.

Kenwood Schematics - Kenwood schematics diagrams in high resolution format, includes Kenwood TS-830S , TS-820S and TS-520S

Electro Voice 664 Wiring - Electro-Voice Model 664 (EV 664) cardioid microphone, wiring diagram, pictures and data sheet

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.

Basic Multimeter project - A basic multimeter project with full schematic diagram by G3PTO

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

Make your own multimeter - Homebrew a multimeter with this article

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

RF Probe for HF - A RF Probe circuit for the RADIO frequency experimenter to check the presence of a RF signal and also to measure its strength

RF Probe project - A simple RF probe diagram

A DIY Square Wave Signal Generator - This circuit is very simple and has a fantastic range of potential uses.