[RTTY] What is this auto mode that QRM's me?

[Joe Subich, W4TV]

> This auto mode is characterized by two sides chirping at each other,
> one side typically is "longer" than the other. The short chirps are
> just a second or so, the longer chirps are several seconds.

That is PACTOR - probably PACTOR II which is a 500 Hz wide mode.

Just imagin if each of those stations was 2.7 KHz wide as ARRL want
with legalizing PACTOR 4 in the traditional CW/RTTY bands!

73,

    ... Joe, W4TV


On 3/30/2014 12:20 PM, Shoppa, Tim wrote:
> With all the Winlink and RM-11708 talk going around, I have a
> question.
>
> When I contest especially on 80M RTTY band (also occurs other bands,
> but most frequently on 80M RTTY band, may be weighted by the fact
> that I like 80M the most!) I am often QRM'ed by some sort of
> automatic digital mode.
>
> This auto mode is characterized by two sides chirping at each other,
> one side typically is "longer" than the other. The short chirps are
> just a second or so, the longer chirps are several seconds.
>
> Bandwidth is similar or broader than RTTY but it is not RTTY.
>
> I think this is some sort of ALE mode or HF packet, but don't know if
> it's Winlink.
>
> It most frequently comes up on me after I've been running on a freq
> for 10 or 20 minutes or even more.
>
> I know that this auto mode "sees me" because if I pause, it switches
> from "short chirps", to the long chirps. So clearly this auto mode
> sees me on the frequency and knows the frequency isn't clear, but is
> trying to carry on nevertheless.
>
> Does this sound familiar? I am on east coast US and I'm pretty sure
> this is some sort of ALE mode (unsure which one) and I'm 100% sure
> there's no human at either end.
>
> Tim N3QE _______________________________________________ RTTY mailing
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