- Hello MT-63'ers,
I'm new to this list and to this mode. I've downloaded Nino's software
for MT63 and am looking forward to experimenting. I know that 14.347 in
USB is the preferred frequency at the moment. My question: Does that
14.347 represent the indicated frequency of the suppressed carrier or is
it something else, such as the actual frequency of the lowest
transmitted tone, etc.?
With other modes (except for SSB, of course) I have been using actual
transmitted frequencies, rather than that of the suppressed carrier, but
I want to be sure I'm conforming to the standards for this mode.
Can anyone help reassure me that MT-63 is OK with the USA's FCC?
Thanks for your help and 73,
John W2KI (New York)
Part 97 nowadays calls for a "new" mode to be publicly
published before it is considered "legal". Exactly
what that means is not clear --- ARRL seems to
say that a blurb in QST or article in QEX or the
DCC proceedings is considered "adequate".
MT63 has been discussed ever since its inception on a
public list, i.e., HFSIG and I am fairly certain that
one can argue that it is as publicly published as one
can get, but I still would like to see someone write
a proper article for posterity. So how about that folks?
A number of us in the US have been using
MT63 on the air for some time, and we believe that we
are meeting all legal requirements. Activity is rather
sporadic however but perhaps this will change now.
I have published Pawel's Readme file from the Linux
distribution on my web page that contains a bit more
technical details, if anyone is interested in that.
Not sure this helps.
On Tue, 23 Nov 1999, John Hirth wrote:
> From: John Hirth <w2ki@...>
> Can anyone help reassure me that MT-63 is OK with the USA's FCC?
> Thanks for your help and 73,
> John W2KI (New York)
> > - The MT63 Reflector -
Johan has answered your question about MT63 being street-legal as well
as anyone could.
In answer to the question about the operating frequency, the answer is that,
unlike most modes (and not a good idea, I know), the frequency quoted is
SUPPRESSED CARRIER, i.e. the actual signal will be some 1 - 2 kHz
This mode is new and still being experimented with, so many (most) QSOs
have some SSB chatter involved, rather like a typical SSTV contact, which
is why the frequency is quoted this way.
In the future, once things have settled, and we all agree that no matter
what the mode is, I believe we should quote the frequency of the LOWEST
TONE of the transmission (i.e. 500 Hz baseband). In the meantime,
we go with the suppressed carrier frequency, and operate USB.
- I think this would cause more confusion. If we stick
with the suppressed carrier frequency, at least you know what
to set your radio to. If it makes sense for voice, it ought
to make sense for other modes...
At 09:27 AM 11/24/99 +1300, you wrote:
>In the future, once things have settled, and we all agree that no matter
>what the mode is, I believe we should quote the frequency of the LOWEST
>TONE of the transmission (i.e. 500 Hz baseband). In the meantime,
>we go with the suppressed carrier frequency, and operate USB.