Topband: Norton preamp

[shristov at ptt.yu]

Ford Peterson <ford at cmgate.com> wrote :

> I've been following this thread and took a look at Dallas Lankford's
> article.  It looks interesting.  And although &quot;...he seems to be very
> meticulous and conservative,&quot; he also boast of the magical 2N5109 preamp as
> having an IP2 of +80dBm to +100dBm based on single versus P-P design (top of
> page 7).  I can absolutely, positively, beyond any reasonable doubt, assert
> that this is an absolute impossibility.  That's so fantastic I had to
> re-read it an actually ponder how big a signal that really is...
 
>  1W is +30dBm
> 1KW is +60dBm
> 1MW is +90dBm
 
> I can absolutely assert that anything looking like a 'circuit' in the signal
> path of 10 MegaWatts of RF will absolutely vaporize in a spectacular blue
> flame instantly.


Intercept Point values represent no real physical power.

They are rather arbitrary numbers calculated from distortion
measurement results. It is, therefore, perfectly possible to have
such a large numbers with low distortion, low power circuits.


73,

Sinisa  YT1NT, VE3EA