Avcomm Developments Ltd.
Although no longer in production, we still maintain this site as support for our Glider and Aircraft radios type GL72A and GL72B.
If you want information on them you can download the
User Handbook as an Adobe file (1.4MB)
and the GL72A Test Specification as an Adobe file (48KB). (The GL72B version has twice the tx output power of the "A" version.)
and the schematic diagram and component locations. as an Adobe file (237KB), coplete with a diy fault guide.
However, pse be aware that many of the components are no longer obtainable and we have exhausted out 10 year maintenance stock.
For more information on suitable microphone installation see here.
Although no longer in production, we still maintain support for our Portable VOR type GL32P.
If you want information on it, you can download the
Information or the User Manual as Adobe files (800KB) or
the Installation schematics