[Elecraft] TS870

[Craig ...]

It would be nice if the K3 has a perfectly designed
ALC which results in all IMD products  being down 40
db at 5khz and 80db down at 20khz. For the needs of
VHF contesting IMD products should ideally be down 100
db down at 20 khz.   However expecting this level of
IMD performance from any modern ham radio is truly a
dream. However older radios like the TS520S and TS830s
could achieve or come close to this level of
performance.

 I don't know if the K3 has a perfectly designed ALC,
or if it has a some way of controlling the drive level
without  activating the ALC like the FT1000D and
IC7800  radios. A drive control is a great way of 
driving the PA  even when the ALC has a tendency too
overshoot which causes much of the horrendous  IMD
that we hear so much of on the bands.  Unfortunately 2
tone  numbers don't tell us much about how the
transmitter performs under real world voice
conditions. Lets hope that the K3 has got it right.

Craig
VK3HE
--- Julian G4ILO <julian.g4ilo at gmail.com> wrote:

> When you listen to the "music" most people listen
> to, the quality
> hardly matters. :)
> 
> However, there are lossless audio compression
> formats, and formats
> that can support higher bit-rates (and therefore
> presumably higher
> fidelity) than standard CDs, so I guess the
> advertising is true. It's
> just that most people are happy to trade quality for
> small file size.
> 
> As far as amateur communications go I think the
> quality of the
> transmitted audio makes more difference than the
> quality of the
> receiver. Some of the cleanest sounding SSB I have
> ever heard came
> from the Kenwood TS-520 / TS-820 / TS-830
> transceivers with their tube
> finals. Then solid state PAs came along. I doubt if
> even the K3 output
> stages will have better linearity and IMD than a
> pair of 6146Bs in
> push-pull, but Elecraft is always capable of
> surprising us. ;)
> 
> -- 
> Julian, G4ILO K2 s/n: 392  K3 s/n: ???
> G4ILO's Shack: www.g4ilo.com
> Ham-Directory: www.ham-directory.com
> 
> 
> On 8/24/07, Don Wilhelm <w3fpr at embarqmail.com>
> wrote:
> 
> > IMHO, as a society, we may declining rapidly in
> audio perception when I
> > hear advertising statements which hint that MP3
> recordings are better
> > quality than CD recordings!  We have finally
> achieved good quality
> > digital preservation of sound waves, and now the
> iPod crowd and its
> > popularity may be diminishing the easy
> availability of high quality
> > recordings for the consumer - that trend concerns
> me.
> _______________________________________________
> 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
> 



       
____________________________________________________________________________________Ready for the edge of your seat? 
Check out tonight's top picks on Yahoo! TV. 
http://tv.yahoo.com/