[Elecraft] K3: CW feature request

[Bob Cunnings]

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.

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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