In article , Michael wrote:

"Mark Zenier" wrote in message
...
In article , Michael
wrote:
I'm hearing some RTTY on 4293 and 8451. I think these may be NOAA reports
coming from Kodiak Alaska. There is supposed to be a NOAA station with
carriers on 4298 and 8459.

When I use my receiver in USB to try to decode these using MMTTY, as you
would expect, I have to tune off the carrier to 4293 and 8451 to get the
mark where I need it to be. These signals have a shift of 850 as is with
the NOAA RTTY reports. The strange thing is, these dont seem to be in the
clear. I cant decode them as I can decode other NOAA reports.

Does anyone have any idea if these are the Kodiak NOAA reports or
something
else ???

850 shift? They're probably something else. Back when I was activly
monitoring RTTY (10-15 years ago), there were a large number (about
50 percent) wide shift stations. But I NEVER got copy on any of them.
They were always there, with strong signals (here in Seattle). My guess
was they were encrypted point to point links, maybe in the eastern Soviet
Union/Russia. Or maybe some back up signals for US Military in Alaska.

Hitting the web, it looks like the Coast Guard only transmits
weather on narrowband SITOR now.

http://www.nws.noaa.gov/om/marine/hfsitor.htm

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)

If they dropped the RTTY reports in favor of Sitor B, I gather they must
have done it only a year or so ago. I remember three years ago I could
regularly decode the RTTY out of Boston and Halifax and they all had a shift
of 850. I'm sure they still transmit weather fax images as I've decoded a
few of them over the past few days. Though, what I can hear onthe Boston

Check http://www.navcen.uscg.gov/marcomms/cgcomms/fax.txt

frequencies doesn't sound like Sitor B. I'm familiar with what a Sitor B
signal sounds like and looks like on a band scope because I decode the
NAVTEX on 518 all the time. What I can now hear on the Boston frequencies
of 4235, 6340.5, 9110 and 12750 doesn't sound anything like Sitor B. When
they arent transmitting weather fax I'm hearing a signal that dosent sound
like Sitor B or look like it on a scope. I'm sure its somthing or other, but
I dont know what it is.

I'll keep at it.

Maybe it's just the idle signal that they use between fax signals.
I havn't poked around with weather fax for 20 years, do they have
some sort of content coding now, so that the receiver only prints
what the user wants?

I though that pretty much everything public used 170 or 425 Hz shift.
At least those were the shifts that worked best for me getting copy.

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)