NRG WORKSHOP

including our extensive FAQ section

Decibel Scale & Information - Shows the table for using the Decibel system & shows 2 examples of converting.

10 Watt Amplifier Schematic (Full Schematic) - The full circuit design for a 10 Watt RF Amplifier.. Designed for 50mW (0.05 Watts) drive power.

PLL Pro II Operating Principles - This shows the key features & main operating principles of our older PLL Pro II transmitter.

Half-Wave Dipole Aerial & 1:1 Balun - Shows and explains "Wavelengths" and how they are catered for in an aerial system. You will learn how to make an aerial system as well as a 1:1 Balun here.

Unlock Power-Down - If using a PLL Pro 3 transmitter, this feature comes as standard, but if you use a PLL Pro II (older version) - then you may need to install an "Out-Of- Lock Power Down" system. And here is how to do it (Includes circuit design / Schematic)

RF Amplifier Construction Example - Building an RF transmitter is a tricky business, and if you going to attempt it then why not read this very useful article.

Early 5 Watt PLL Stereo Transmitter (From "Radio Jukebox") - The entire circuit design / schematic for an early PLL type transmitter. There is a stereo encoder incorporated in the design.

RF Low-Pass Filter For 88-108 MHz Transmitters - Need to build a low-pass filter for your transmitter??? Click here to see how. Circuit Diagram (schematic) and component values are included.

Test Circuit For BLF177 MOSFET Transistor - Here there is a Circuit Diagram (Schematic) & component values for a test circuit for the rugged & robust BLF177.

Monopole Aerial Radiation Patterns - If you are having trouble deciding what aerial to buy and for what reasons, have a look here and you can see how your aerial will perform with the help of our radiation patterns

Transmitter Kit Building Advice - If you are going to be building a kit please have a look at this part of the workshop to build your kit most effectively. You will not believe the exhibits shown!

Tracking Transmitter Schematic - Need to keep of track of something, perhaps a person, pram or car. Click here to see information on building a Tracking Transmitter for 108MHz.

Amplifier Stability - This document will explain how to keep your RF amplifiers free from unstable properties such as harmonics & other spurious emissions.

High Voltages With Capacitors & Diodes (Deathtrap) - In the case you need you effectively multiply an AC voltages with capacitors & Diodes then look here.

Balanced To Unbalanced Audio Conversion & Vice Versa - This document shows how one might accomplish a balanced to unbalanced audio conversion or indeed an unbalanced to balanced conversion. Circuit diagrams are included as well as values for components. Thanks to Bias-Comm for this contribution.

The Workings Of A 5 Watt FM VFO Kit - This document elaborates on exactly how our 5 watt FM kit operates and functions.

A Versatile Broadband 88 - 108 MHz 5-Watt RF power amplifier ....Gives 1 watt transmitters a useful power increase. Full Schematic shows the simplicity of this MRF 237 based amplifier.

An example of Bad Transmitter design.....The 'Pantek' 3 watt tx kit explained. A very popular transmitter kit which was just about all you could find in 1980.

The Slim Jim end fed vertical aerial.... This page takes a look at the basics of the versatile 'Slim Jim' antenna. It is quite straightforward to construct one yourself and a good starting point is right here!

Band 1 Link system.... This section illustrates a complete transmitter set-up complete with Band 1 link! The link separates the studio from the transmitter....desirable for several reasons! The system is stereo capable and the page shows how the various units are configured.

The Medium Wave Loop Aerial.... The Loop aerial is an indoor directional medium wave (AM) receiving aerial with some unique properties. If you are an AM d'xer, this is for you! Although nothing new, it takes some beating and you see how to make one here.

The Super Bal ......Balanced to unbalanced converter. A superior type of solid state balance to unbalance circuit for audio enthusiasts. Conventional wound transformers for studio work are a thing of the past if you build this!

Very High Power Transmitter Valves ...Although you may be ecstatic over your 25 watt transistorised rig, this page shows that 25 watts is small beer in the world of high power transmitting tubes! Take a look at this page to see REAL VHF power amplification.

High Power Medium Wave Transmitters...Brookmans Park in London is where several Radio stations have their AM medium wave transmitters. Here are some good quality photographs showing the scale of things at the multi-kilowatt level in AM broadcasting. Some AM technical background is also explained in this updated version.

A Stereo Coder complete circuit.... Based on the popular switching principle, excellent results can be had for little cost. The whole circuit can be be built on strip board and virtually no setup is required. This circuit will convert any half decent fm transmitter into full FM Stereo!

PLL FM Transmitter from 1985......This includes a quality picture of a tidy 1.5 watt transmitter and the layout shows how important it is to configure the circuit correctly.

Fitting a built kit into a metal enclosure.......This page was sent to us, in it's entirety, by an NRG customer. He shows here how he fitted his newly assembled PLL-PRO III 4-Watt Exciter into a metal box. This really is a good idea and 'Trick' in the UK, did this at very low cost!

Another Customer's built-it-himself job .....is presented here. This time it's pretty adventurous too, a very compact 40 watt transmitter complete with built in psu! Using the PLL-PRO III as driver for the 40 watt amplifier module, this looks good!

A Cute Slim Jim Aerial ...for portable operation. You can pack this aerial up and carry it in your pocket! Seriously, this is a version of Frank Judd's famous 'Slim Jim' aerial that is made out of 300-ohm ribbon cable, the stuff that came with your hi-fi. Take a look, it's a nice little evening project!

The PLL-PRO 3 RF section schematic...This page is for RF engineers and shows the workings of the balanced oscillator/frequency multiplier and broadband 4-watt amplifier circuitry. It's clever stuff and the others are still trying to match it for sheer performance and stability.

Typical London 100 Watt Fm Transmitter For Private Radio Broadcasting...A very slick looking transmitter that was used on a London based private radio station. Also, new pictures of a 50 watt model from the UK Private Radio Scene, plus some link receivers. Well worth a look. Now including a "professional" aproach from 'DAVE'.

PLL and VFO Transmitters - These are the two FM Transmitter types available. Although PLL is now taking off big time in low power fm broadcasting, the VFO still has the edge on price and simplicity. Take a look and see what both have to offer in this basic but informative article on fm transmitters.