My father had a Hallicrafters HT-9 that did FMbut he never used it
on FM as long as
I remember. That line came to the market after WW II, if I remember well.
He sold his Hallicrafters transmitter in 1961 or so...Johnson HF
transmitters did not have
any measure of FM emissions.
Maybe some
There was some packet activity on 29 MHz in the 90's . While I could do
a LOT of forwarding at 1200 baud
on 28.18 MHz at 1200 baud using a SSB radio, I was NEVER lucky to get a
connection at 1200 baud FM AFSK,
even when I heard some of them. SNR was too bad.
The numbers tell that such a link
I was just looking in part 97, (regarding the legality of ISB), and
noticed something else...
In the US, even though regular NBFM is legal above 29 MHz, it's only
legal for voice. The entire 10-meter band is still split up between
RTTY/Data and Voice/Image like the rest of the HF bands..
So
]
To: digitalradio@yahoogroups.com
Sent: Thursday, February 01, 2007 6:08 PM
Subject: Re: [digitalradio] NBFM Packet Voice on HF?
I was just looking in part 97, (regarding the legality of ISB), and
noticed something else...
In the US, even though regular NBFM is legal above 29 MHz, it's only
legal for voice
Danny Douglas wrote:
Why is that? FM is the carrier, afsk is the mode. Just as SSB is the
carrier for an AFSK signal. If you can run AFSK on SSB in the other bands,
why not 10? Does it specifically say NBFM only for voice?
That would be an F2D emission. Legal on frequencies where
--- Danny Douglas [EMAIL PROTECTED] wrote:
Why is that? FM is the carrier, afsk is the mode.
Just as SSB is the
carrier for an AFSK signal. If you can run AFSK on
SSB in the other bands,
why not 10? Does it specifically say NBFM only for
voice?
Danny Douglas N7DC
ex WN5QMX ET2US
Paul L Schmidt, K9PS wrote:
Now, if someone hadn't confused the regulation-by-bandwidth rulemaking
proposal by putting unrelated changes in automatic control in the same
proposal, it might have been successful. Had it been, we'd be able to be
talking to someone on SSB, and blast them a
kd4e wrote:
Anyone familiar with NBFM Packet activity on 10M,
29,100 - 29,300MHz ?
I came upon an old Sonar VFX 680 NBFM/CW exciter
that covers 160-2M and it got me wondering why
NBFM is not included across the Ham HF spectrum
bandplan. I don't believe it is any wider than
an AM signal.
Good points, Paul,
One thing that I found with longer distance FM signals on HF, even
though 10 meters can be close to the MUF when it is open, is that there
is a lot of frequency inversion or other anomalies from the ionosphere
that make it rather annoying and unsatisfactory. This is not true
KV9U wrote:
Good points, Paul,
One thing that I found with longer distance FM signals on HF, even
though 10 meters can be close to the MUF when it is open, is that there
is a lot of frequency inversion or other anomalies from the ionosphere
that make it rather annoying and
Anyone familiar with NBFM Packet activity on 10M,
29,100 - 29,300MHz ?
I came upon an old Sonar VFX 680 NBFM/CW exciter
that covers 160-2M and it got me wondering why
NBFM is not included across the Ham HF spectrum
bandplan. I don't believe it is any wider than
an AM signal.
Collins Model 75A-1
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