[Elecraft] unequal power output per tone in FSK

[Hank Garretson]

Mark and space switch between two frequencies 170 Hz apart.  There should be
no change in amplitude between mark and space.

With my K3 the difference between mark and space is about 1 dB.  Too much.
Elecraft is aware of the problem, and the sooner it gets fixed the better.

Side note.  There were some pretty wide RTTY signals in the Roundup.  It
would be interesting for someone smarter than me to calculate the bandwidth
of a 0-dB-difference-between-mark-and-space signal and the bandwidth of a
1-dB-difference signal.  I sure hope my signal wasn't one of the wide ones.

73,

Hank, W6SX


On Mon, Jan 10, 2011 at 8:54 AM, <nr4c at widomaker.com> wrote:

I may be all wet here, but I seem to think this is understandable.
> FSK uses two tones, one is the MARK and one is SPACE.  There are only
> two states, you will have one or the other tones on the air all the
> time.  One tone is the base, and if the signal is un-modulated, it
> would be transintted 100% of the time.  The other tone is a pulsed
> deviation from the base, so is only "ON" for short pulses when needed
> to form a character.  Since there is hardly ever an even distribution
> of MARK/SPACE, the power out will not be the same.
>





Ski Exuberantly,

Hank

Mammoth Lakes, California

Elevation 8083 feet in John Muir's Range of Light