[GreenKeys] Terminal unit (HAL ST-5000) adjustment

[Ethan Blanton]

Ralph Mowery wrote:
> >From what you are saying you are using low tones, but have a filter set at
> 2260.  That does not sound right at all.  

The 2260 was a typo; it should have been 1360, which is the center
point for low tones (1275/1445).  Fldigi specifies its frequency for
FSK by the midpoint, not mark (which I think was more common for
vintage equipment).

> I am not familiar with  the drake 2b and filtering arrangement ,but if it is
> adjustable for center frequency, it should be much lower than 2000 if using
> low tones.  If the ellipses are not at right angles to each other, then the
> filters are not exactly  tuned, but if not off too far you should be able to
> copy ok.

The Drake filter was centered around the low tones, near 1360.  (I
don't know exactly where, and the 2-B  filters are not exactly
symmetric.)

It was my experience that I could indeed copy OK with the ellipses not
at right angles, but only under near-ideal conditions.

Thanks for your input!

Ethan