[RTTY] More on the KH6ZM mystery

[Alex Malyava]

the same story here.
I remember looking at the screen for a long time, like several transmissions
in a row.
the callsign was coming differently every time and it (audio) was truncating
right in the middle of last letter...
I got KH6Z, KH6ZM, ZN, Z-garbage... It was ZM most of the time so I assumed
that and logged it.

K2BB

On Wed, Jan 12, 2011 at 6:39 AM, Larry <lknain at nc.rr.com> wrote:

> I saw KH6Z, KH6ZN, and KH6ZM on the East Coast. KH6Z would
> be an unusual call but the signal struck me as being truncated. KH6ZN
> was heard once and it too sounded truncated. So I had to listen a few
> times but finally got KH6ZM (which I recognize as well) a couple of times
> and went with that.
>
> Some programs have a setting for PTT drop delay (and some the leading
> pick time). Perhaps Alex needs a bit more delay in the drop. Some
> people do sequence the radio and amp timing so that could be another
> possibility as suggested.
>
> 73, Larry  W6NWS
> ----- Original Message -----
> From: "Kok Chen" <chen at mac.com>
> To: "RTTY Reflector" <RTTY at contesting.com>
> Sent: Wednesday, January 12, 2011 3:49 AM
> Subject: Re: [RTTY] More on the KH6ZM mystery
>
>
> >
> > On Jan 11, 2011, at 10:13 PM, Jim W7RY wrote:
> >
> >> I have him on 20 and 40 as KH6ZM.
> >
> > I copied him on 15m and 40m as KH6ZM also, and more than once when I
> click
> > on him again.
> >
> > Based on the waveform K2BB has recorded, I suspect there could be 4
> > answers (two of which produces KH6ZM :-).
> >
> > You can print him as 1) KH6Z if the character with the truncated bit is
> > squelched away, 2) print him as KH6ZN if the demodulator decoded the
> > trailing noise as a zero, 3) print him as KH6ZM if the demodulator
> decoded
> > the trailing noise as a one, or 4) his amplifier was cut off but somehow
> > his exciter is not, in which case, people who get really good signal to
> > noise ratio from his signal, will always print KH6ZM correctly.
> >
> > If most of the west coast prints him as KH6ZM, then (4), unlikely as it
> > might me, may be the correct guess.
> >
> > The recorded signal dropping is so very clean that there is almost no
> > chance that it is caused by propagation.
> >
> > 73
> > Chen, W7AY
> >
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> >
>
>
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