SEM 52 family
Actually, "SEM 52" is a good example how messy a numbering
system can get. Originally, there was only one SEM 52, a crystal controlled six
channel small strap on radio, first to be seen around 1971. However, less then
ten years later a newer version of the SEM 52 - with six synthesized frequencies
to be set internally -
appeared, being called the SEM 52-S. And the original SEM 52 was then renamed
To complicate things even more, the newer SEM 52-S has two versions, as there is also a SEM 52-S/Fz - described on the page dedicated to the SEM 52-S.
Even more recent is the SEM 52-SL, with 12 channels and more sophisticated means of programming the frequencies.
Lastly, one can even find the SEM 53 mentioned, which was developed as a prototype in 1972 but never got into production.
07-11-2003 23:24 +0100