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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