[Yaesu] N-Channel MOSFET Replacement

[Peter Markavage]

3SK48's, if you can find them, is a very good low noise/high gain
transistor for front end receiver applications.

Pete, wa2cwa

On Fri, 31 Aug 2007 10:48:51 -0400 rbethman <rbethman at comcast.net>
writes:
> Deon,
> 
> This same thing was fiddled with in Kenwood Transceivers.
> 
> They were initially built with 3SK45s.
> 
> We specifically replaced the 3SK45's with the 3N201s.
> 
> These four beasties, 40673s, NTE222s, 3SK45s, and 3N201s are all 
> very 
> close relatives.
> 
> We managed to get the 3N201s from someone working in the Bell Labs 
> in 
> Florida around 1980.
> 
> They are all also direct plugins for each other.  Sometimes the ONLY 
> way 
> to determine which one to use is simply try one of each in YOUR 
> application.  The minor circuit differences between the radios can 
> make 
> all the difference.
> 
> I added the list back into the discussion.  THEY may find technical 
> 
> merit or useful information.
> 
> Bob - N0DGN
> > There is a well-known N-Channel MOSFET replacement to increase 
> the
> > RX sensitivity of the mixer (Q103) in the FT-301.  I believe that 
> it also
> > increases the sensitivity of the first RF amplifier of the 
> FT-101.
> >
> > Does anyone know which MOSFET is used for this replacement?
> >
> > Thanks
> > Deon ZS1ZL
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