[Elecraft] New K3 SN#207 built but question on AM Filter

[Paul Clay]

I would.  :=)  I'm not a hardcore ham operator, and
one of the big selling points for the K3 for me was
getting   excellent broadcast radio receive capability
(say, on par with a Drake R8B or AOR7030).  (I
currently run a K2-100 with which I'm very satisfied.)

- Paul, N6LQ


--- Dave Martin <dave.w5dhm at gmail.com> wrote:

> I've seen a number of old U.S. broadcast receivers
> with a 10 KHz notch
> filter in the audio to get rid of the high pitched
> hetrodynes from the
> adjacent channels.  But the wide IF sure brightens
> up the music when
> listening to your local honky-tonk station, and
> nobody gave a rip how
> wide their IF was if their music sounded good. 
> That's why I was
> hoping for the option of going as wide as I see fit
> when conditions
> allow.  But then who (other than yours truly) would
> be using a K3 to
> listen to the local BC when he could be working CW
> while enjoying 100
> Hz selectivity?
> 
> Dave  W5DHM
> >
> >
> > The basic reason has already been explained,
> however, there are very few
> > cases were exceeding 3kHz audio bandwidth is
> useful.  HF broadcast
> > stations use 5kHz channelling, which would only
> allow them 2.5kHz with
> > brick wall filtering at both transmit and receive
> ends, although they
> > probably do expect to suffer significant adjacent
> channel interference.
> >
> > MF broadcast stations use 9kHz channelling in
> Europe and 10kHz in the
> > USA, but I suspect that adjacent channel
> interference is less
> > acceptable.  As they were designed to be received
> with LC IF filters,
> > with poor shape factors, I suspect they don't even
> make use of the full
> > channel, and if they did, they would probably be
> required to have
> > filters which put the adjacent channel into the
> filter stop band.
> >
> ...
> > David Woolley
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
> 
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> 



      ____________________________________________________________________________________
Be a better friend, newshound, and 
know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ