[Collins] 75A-3

[Ron Youvan]

   Joe Walden wrote:
/*snip*/
>   My question today is
> about some mods that Collins sent out back in the 1950S...  I have these
> three bulletins...  Bulletin #1 is a mod to reduce internal noise and
> improve the signal to noise ratio under average operation conditions..
> Bulletin #2 is for receivers serial #1300 and over.    Bulletin #3 is for
> receivers serial #1299 and below..  My receiver is serial #391..  This
> bulletin concerns a 2 to 1 improvement in the cross modulation and blocking
> characteristics...  Should I make these modifications in bulletins #1 and
> bulletin #3???

   In my personal experience there is no such thing as a bulletin to be applied to a range of after 
a certain number, this sounds like a typo to me.  When a bulletin is published it would apply to 
units previously made, not future units, those they do at the factory.
-- 
    Ron  KA4INM - Did you know ...
                  ... that no-one ever reads these things?