Ray T. Mahorney wrote:
> Now my question becomes why would we want to use a scramble code?
The normal use of scramblers like this is to prevent loss of sync and
corruption of digital data streams. In some cases -- T1 lines are the
usual example -- the receiver clock will lose sync and the link g
At 07:53 AM 6/25/2008, you wrote:
>Now my question becomes why would we want to use a scramble code?
To avoid pathological conditions such as a long sequence of 0's,
which would make clock recovery from the signal difficult. You want
to have bit transitions as frequent as possible (ideally with
Ron and All:
Please note that there is no prohibition on unpublished codes as long as
they are not used for the purpose of "obscuring the meaning" of a
transmission. ( see 97.309(b) ) Also note that there are provisions for
dealing with situations where there's a concern by the FCC District
D
Now my question becomes why would we want to use a scramble code?
- Original Message -
From: "Nate Duehr" <[EMAIL PROTECTED]>
To:
Sent: Tuesday, June 24, 2008 10:20 PM
Subject: Re: [dstar_digital] D-Star scramble code
These types of "scramble" codes are c
Ron Wright wrote:
> This was the reason the ARRL in 2007 attempted to get FCC approval for
> wide band modes on bands down to 6 meters...it would open up more modes
> for high speed. So many opposed it due to thinking single ops would be
> occupying large chunks of spectrum.
ACTUALLY... It wa
These types of "scramble" codes are common in telecom for doing things
like "ones density".
I wouldn't even call them "scrambled", that seems to be a term that
picked up somewhere in D-STAR.
Telecom engineers would simply call this "line coding" of different sorts.
Study all of these, and you'
fair point which I'd not considered. Thanks for the clarification
- Original Message -
From: "Evans F. Mitchell; KD4EFM / AFA2TH / WQFK-894" <[EMAIL PROTECTED]>
To:
Sent: Tuesday, June 24, 2008 5:57 PM
Subject: RE: [dstar_digital] D-Star scramble code
not if i
Ray,
Had this discussion with a Ham friend on this topic yesterday.
As others have said it is legal since it is published and known. This has been
a change in recent years where the FCC now allows about anything as long as it
is published and stays within the allowed bandwidth for a band or mo
Ray,
This is part of the encoding technique for modulating the signal, it is a
fixed encoding, not an encryption. Think encoding as in ASCII or Baudot,
not encryption like WEP or WPA.
Micha - the people to check with are Robin AA4RC and Satoshi (Call escapes
me) who have worked on hardware proje
om [mailto:[EMAIL PROTECTED]
On Behalf Of Ray T. Mahorney
Sent: Tuesday, June 24, 2008 12:20 PM
To: dstar_digital@yahoogroups.com
Subject: Re: [dstar_digital] D-Star scramble code
someone correct me but would that not run counter to the prohibition of the
transmission of codes and ciphers?
someone correct me but would that not run counter to the prohibition of the
transmission of codes
and ciphers?
- Original Message -
From: "Michael Przybilla" <[EMAIL PROTECTED]>
To:
Sent: Tuesday, June 24, 2008 3:37 PM
Subject: [dstar_digital] D-Star scramble code
Hi
Has anyone tried
11 matches
Mail list logo
