[Elecraft] K3: CW feature request

[Alan Bloom]

On Thu, 2009-12-03 at 14:35 -0700, Bob Cunnings wrote:
> Sorry, I was confusing the two, you did say *Sideband* 9.001 after all.
> 
> So in the case where the IF is 5 MHz and the VFO is 9 MHz, we have:
> 
> Subtract 5 MHz IF:
> VFO 9.000 - 5.000 = 4.000 MHz
> VFO 9.000 - Sideband 5.001 = 3.999 MHz
> ==> LSB
> 
> where we do see the inversion of the sideband.

Right.  If the ***VFO*** is at 9 MHz and the ***IF*** is at 5 MHz then
the sidebands are inverted on the two bands.

Alan



> Bob NW8L
> 
> On Thu, Dec 3, 2009 at 11:34 AM, Alan Bloom <n1al at cds1.net> wrote:
> > No, we're talking about sideband direction, not VFO tuning direction.
> >
> > Al
> >
> >
> > On Thu, 2009-12-03 at 08:15 -0700, Bob Cunnings wrote:
> >> Er, hold on. you write:
> >>
> >> > Subtract 5 MHz VFO:
> >> > Carrier   9.000 - 5.000 = 4.000 MHz
> >> > Sideband  9.001 - 5.000 = 4.001 MHz
> >> > ==> USB
> >>
> >> but shouldn't it be:
> >>
> >> Subtract 5 MHz VFO:
> >> Carrier   9.000 - 5.000 = 4.000 MHz
> >> Sideband  9.000 - 5.001 = 3.999 MHz
> >> ==> LSB
> >>
> >> Since we changing the VFO, not the IF freq?
> >>
> >> Bob NW8L
> >>
> >> On Wed, Dec 2, 2009 at 10:39 PM, Alan Bloom <n1al at cds1.net> wrote:
> >> > On Wed, 2009-12-02 at 21:06 -0800, Alan Bloom wrote:
> >> >> On Wed, 2009-12-02 at 18:36 -0800, wb6rse1 at mac.com wrote:
> >> >> > LSB on the lower bands and USB on the higher bands is an artifact of
> >> >> > the mixing scheme, from the early days of SSB, of a 9 Mc IF mixed with
> >> >> > a 5.0 - 5.5 Mc VFO. (Yes, it was Mc in those days, not MHz.) Add and
> >> >> > you get 20m. Subtract and you get 80m. The subtraction results in
> >> >> > sideband reversal and so LSB became the "standard" for 80m. There is
> >> >> > really no reason now to not to just operate USB on all bands other
> >> >> > than tradition.
> >> >>
> >> >> I've heard people say that many times over the years but clearly it's
> >> >> not true.  A 9 MHz IF set up for (let's say) USB will still be USB no
> >> >> matter whether you add or subtract the 5-5.5 MHz VFO.
> >> >
> >> > I just did a little Googling on the Internet (AC6V.com and elsewhere)
> >> > and discovered to my astonishment that this is an actual bona-fide
> >> > controversial subject among radio amateurs.  Despite the fact that a
> >> > simple 2-minute back-of-the-envelope calculation is all it takes to
> >> > disprove the myth.  For the record:
> >> >
> >> > Intermediate frequency:
> >> > Carrier   9.000 MHz
> >> > Sideband  9.001 MHz
> >> > ==> USB
> >> >
> >> > Add 5 MHz VFO:
> >> > Carrier   9.000 + 5.000 = 14.000 MHz
> >> > Sideband  9.001 + 5.000 = 14.001 MHz
> >> > ==> USB
> >> >
> >> > Subtract 5 MHz VFO:
> >> > Carrier   9.000 - 5.000 = 4.000 MHz
> >> > Sideband  9.001 - 5.000 = 4.001 MHz
> >> > ==> USB
> >> >
> >> > I can't believe people are actually arguing about this!
> >> >
> >> > Al N1AL
> >> >
> >> >
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