How Codan Derive Model Numbers
Now before we get into it, this is information i have gathered from many other people
including my "peers". So please don't flood me with emails if the information is a little
incorrect or sound a little far fetched. If you have better more informed information i
would be grateful in hearing from you so i can correct what i have written here.
Model numbers are derived from the year of manufacture and the revision in development
stage. Now for example 7727 series radio's, 1977 being the year of manufacture and 27
being the revision before actual production, other variants are shown as "B", "C", or "TB"
The development stage is where a company continues to improve on a product before its
released to the world. This is not a hard and fast rule as some products like the Codan
HF1000 & 2000 series including the 4000 series (4404) just doesn't apply here.
For those out there who repair these radio's, its my experience that you never come
across two radio's exactly the same, there are always some small differences in
component values, hence many service manuals are required to cover the different
revisions or modifications posted after manufacture.