A Beginner's Guide to Four Metres
The fact that it is not in widespread use around the world means that there is practically no commercially-built Amateur equipment for the band. Consequently, everyone using it uses either home-made or modified equipment.  (c)
Ross G6GVI

70MHz beacons
Adopted OE9PMJ 50 MHz transverter construction
Danish amateurs have developed a transverter design which is now available in kit form costing around 120 Euros, and profits go to support the OZ7IGY beacon project
ARAC 4m Transverter
This project was originally conceived in about 1995 by members of the Andover Radio Amateurs club. The design concept was to produce a well documented, simple project to enable members to get on the amateur 4m (70MHz) band. The Transverter was designed to be driven by a 28MHz (10m) amateur transceiver or by a CB radio.
70MHz Modification of TenTec 1209
Enjoy building a low-cost kit for the 4-meter (70-MHz) band based on the 50MHz Transverter 1209 from TenTec.
(c) Tony I0JX
My 70MHz rig
Some info about my station