[Collins] mmf and uf

[Garey Barrell]

Chris -

I don't know what time frame you are referring to, but at least in the 
early to mid 50's, mmf referred to "micro-micro" (also referred to by 
some as "mickey mikes") or pico.

I have run into "M" used as a thousands multiplier in 30's schematics, 
rather than the "M" for millions multiplier as used in the 50's forward.

As I recall, (and my memory probably isn't any better than yours!,) the 
"mmf" to "pf" change took place about the same time as the "Mc" to "MHz" 
change, i.e., mid to late 60's.

73, Garey - K4OAH
Atlanta

Chris Pedder wrote:

> Hi,
>
> Over the past few days, and I haven't been watching as carefully as I 
> should, there has been reference to mmf and this has been equated, 
> from time to time, to pf.
>
> This is incorrect both logically and historically. When I was in short 
> pants, I seem to recall that mmf was the common designation for what 
> we now refer to as uf. (milli-milli being the equivalent of micro) 
> This is a long time ago and my memory may be less good with advancing 
> years.
>
> My absolute first memories of life consist of being made to sit at the 
> dining room table and insert 'T' and 'U' transformer laminations into 
> a bobbin, alternating sides. These transformers were used in homebrew 
> TV sets just after WW2. Slave labour for my wicked Dad   :)
>
> Chris
>
>