|Spectrum Communications of Dorchester manufacture a range of products for the VHF bands. Since 1988, they have been producing 4m transverters in kit and ready-built form.|
The picture shows the latest design (2005) of transverter board with its companion 25W PA.
|Danish amateurs have developed a transverter design which is now available in kit form, see OZ2M's website.|
The kits cost 125 € including shipping within Europe, and profits go to support theOZ7IGY beacon project.
With more than 175 kits sold this transverter is probably the best selling transverter kit these days.
An accompanying 25 W PA kit is also available for 130 €.
|Mechanics & Electronics Inc, run by Gabi HA1YA, is now producing a 4m transverter and a range of valve RF PAs and associated control and power supply units.|
See his website for more details.
The input power required to drive these units is around 0.3 Watts: they were originally supplied with an external 15dB power attenuator (as shown in the photo), which dropped the output power from a 10W transceiver to a suitable level.Microwave Modules of Liverpool were well-known in the 1980s for their amplifiers and transverters. Many of these are still working, and appear on the second-hand market - check the dealers, or RadCom members' ads. These were constructed inside a compact Eddystone diecast box with either BNC or SO239 sockets for RF interconnections and a 5-pin locking DIN connector for DC and switching connections. Models were produced for use with 144MHz transceivers as well as HF transceivers using a 28MHz IF. They have been proved to be quite robust units over the years with many proving useful for both portable and home station use. They produce around 10W output and are suitable for all-mode operation.
The same company produced some new models in the mid-1990s, which are reputed to have a much better performance than the originals.
Dave G4FRE has set up an archive of MM circuit information
and Steve M0BPQ has provided a scan of the schematic.
RN Electronics also produced transverters for the 4m band although these too are no longer available new. They were very similar in size and concept to the Microwave Modules devices and were also produced with IF's suitable for both 144MHz and HF transceivers. They were generally better than the Microwave Modules types in that some models gave 25W output and the receive sections were a little quieter. They are very rare on the second hand market however as very few were manufactured but again RadCom members' ads may turn one up.
Mutek produced a nice dual-band transverter for the 50 and 70MHz bands with 25W output. They produced versions for 28MHz and 144MHz IFs but were quite expensive when new, but had a reputation for superb RF performance.
|Cirkit manufactured a kit for a 70MHz transverter designed by Tony Bailey G3WPO. This design was originally published in Ham Radio Today magazine around 1984. It was designed for use with a HF transceiver and used a 28MHz IF. It only produced around 0.5W output and so needed additional amplifier stages.|
Examples of these have been successfully built and used by Roger G3MEH and Ross G0WJR.