[Elecraft] K-1 Sensitivity

[James R. Duffey]

Bill - I stick by my original statement, that one would have to cook up a
pathoglogical antenna for it to limit the bandidth over which noise is
integrated in an HF amateur radio receiving system. I doubt that even the
AEA Isoloop is narrower than the typical SSB bandwidth, 2 - 3 kHz, otherwise
it would not be too useful as an SSB antenna! At CW bandwidths, it is even
harder to imagine such an antenna that would be used and constructed by the
typical ham.

So, I stick by my original statement the bandwidth over which noise is
integrated in a receiving system is determined by the  narrowest bandwidth
stage in the receiving system. For the K-1 under discussion this is the
crystal filter, set in my K-1 and many others to 300 Hz, the bandwidth I
used im my example. It is not usually the receiving antenna, even if it is
very narrow.

My asumption of linear stages is good in this discussion of noise. For very
strong signals it may not be valid, but for strong signals the noise floor
is not an important considertion, nor is it usually the limiting factor in
receiving signals.

Thanks for your  comments.
-- 
James R. Duffey KK6MC/5
Cedar Crest, NM   DM65