The Milli Beacon

This page describes an cheap RF signal source using a low cost temperature controlled crystal oscillator (TCXO).

The idea of using a TCXO came when I was in need for a portable micro beacon that could be used for checking the total receiver performance during DX-peditions or field days. Often you are in doubt if the RX is still working or not.

The signal source can be used for many purposes and at many frequencies e.g. aligning a receiver or transverter yet take care of the other frequencies generated. For my own purpose I use two different base frequencies. 10 MHz that covers both 50 MHz and 70 MHz, and a 48 MHz covers 144 MHz, 432 MHz and 1296 MHz.

Here is a user experience by Lars, OZ1BXM.


The schematic is fairly simple and anyone can make a Milli Beacon 

The diode can be omitted (shorted) if more lower frequencies power is needed. If so less high frequencies will be generated.


The Milli Beacon in a metal sheet box fitted with a 16 MHz oscillator. A standard 9 V battery is fitted too.

Location of the output BNC connector and On/Off switch.


Full spectrum up to 1,5 GHz.

144 MHz signal.

432 MHz signal.

1,3 GHz signal.


The output signal can be used for e.g.

Milli Beacon kit

There are no more kits available.

Bo, OZ2M, www.rudius.net/oz2m