Y is for... Your Own Radio Station.
copyright (c) 2008-2015 Sarah Bluck.
So.. you would like to start your own FM radio station. and you want a transmitter.
You can buy transmitters already built on e-bay, although their quality is not always
good. (you may get a visit sooner rather than later from the radio investigation service,
and the police! Or you may be able to find a commercial transmitter or exciter for sale.
Here are a few commercial units. Usually they are quite expensive, but occasionally they
do turn up cheaply. Then, if you need more power, you can either buy, or build your own PA.
(above). An Eddystone XE series synthesized exciter.
These are available with output powers up to 250W so you may not need a PA stage.
(above). A Continental Electronics 802B exciter.
Another synthesized unit, (10kHz steps), with 5 to 50 watts output.
(above). Norsk-Marconi exciter.
This is my Norsk Marconi transmitter. it's a bi-crystalled exciter so not as frequency
agile as the synthesized units above. It has an added PA on the back to give an output
of 10-15 Watts. This can be used to drive a PA if required. It sounds lovely and warm!
With none of that synth-whine you can get from lesser units. I have used this with a
stereo encoder too and it sounds great.
If you want a kit of parts to build your own exciter and PA, you can order the kits below
and put it all together yourself for a fraction of the price of a commercial unit. These
kits are from an outfit in the USA called "Free Radio Berkeley" see the internet for more
details. The designer Stephen Dunifer was one of the pioneers of low power radio stations
in the United States.
Above the one watt synthesized exciter kit before, and after building. All the parts you
will need are there, and the instructions are easy to follow.
Above. A 40 Watt PA kit. Free Radio Berkeley produce higher output PA units. I bought this
kit as the output I needed for this project was 25 Watts ERP. After the filter unit (below)
the output is cleaner, and still over 30 watts. The filter is well worth the extra few dollars.
All you will need to add will be a metal box to put it all in, a power supply to run it and
some tools. (solder, soldering iron, wire-cutters, pliers, screwdrivers, drill, drill-bits).
On pirate or restricted-service/special-events transmitters you may find it useful to add a
high-VSWR switch reduce the output or switch off the transmitter if an areial fault develops.