I wasn't clear. I meant BCB filters at their receivers would not help those
stations being bothered by the second harmonic.
K7CW
On Tuesday, May 21, 2019, 8:42:15 PM UTC, Paul Kiesel via Topband
<topband@contesting.com> wrote:
Unless I lost track of the conversation, we are talking about a station in
Colombia whose second harmonic is interfering with reception on 1840 in
Uruguay. A BCB filter would likely not help the stations being bothered by this
second harmonic.
K7CW
On Tuesday, May 21, 2019, 7:37:56 PM UTC, Wilson Caselli
<k1mij@hotmail.com> wrote:
I live only 3.5 miles from radio station WBT in Charlotte, NC. WBT runs
maximum allowable power into three phased antennas on 1110. Even a BCB filter
does not eliminate their signal into my Hy-Tower antenna, which by the way
receives them very well. I have some overload from there signal but is this an
offense? I don’t think so. The are not splattering. Their frequency when
last measured was about 20Hz high but well within FCC specifications.
I suggest you purchase a BCB rejection filter and place it in the Tx input of
your receiver/transceiver.
Wilson A. Caselli, K1MIJWCaselli@gmail.com
On May 21, 2019, at 3:23 PM, Paul Kiesel k7cw@yahoo.com [wsjtgroup]
<wsjtgroup-noreply@yahoogroups.com> wrote:
I think 1840 works for most. Moving the FT8 frequency because of one second
harmonic of a broadcast signal is not called for. Getting the broadcast station
to clean up its signal is. There are other activities on 160 that would have to
change frequency if the FT8 frequency were to change. There is one local
nightly "net" in the PNW that meets on 1847. They are already too close to 1840
if one needs to use his noiseblanker and there is no reason to believe they
would move to make another frequency available for FT8. 1840 has been
established and works. Getting that broadcast station to clean up its signal is
the thing to do.
73, Paul K7CW
On Tuesday, May 21, 2019, 5:04:56 PM UTC, Herbert Schoenbohm
<herbert.schoenbohm@gmail.com> wrote:
1844 would be a great solution for FT-8. Now we have to convince the WSJTX
people to put 1844 in their dropdown menu we they do the next release.
They have 1838 for JT-65 which few ever use today and that could be another
option for FT-8.
On Tue, May 21, 2019 at 10:50 AM cqtestk4xs--- via Topband <
topband@contesting.com> wrote:
> I don't have a dog in the fight but why not move to 1843 or 1844. Is 1840
> sacrosanct?
> Bill KH7XS
>
> -----Original Message-----
> From: Jorge Diez - CX6VM <cx6vm.jorge@gmail.com>
> To: Edward Sawyer <sawyered@earthlink.net>
> Cc: GEORGE WALLNER <aa7jv@atlanticbb.net>; TopBand List <
> topband@contesting.com>
> Sent: Tue, May 21, 2019 12:51 pm
> Subject: Re: Topband: AM interference on 1840
>
> Ed
>
> FT8 can move, but 1840 still is useless to do CW, so is not a FT8 problem
>
> George said the two big problems, hope this not increase with harmonics
>
> 73,
> Jorge
> CX6VM/CW5W
>
> El mar., 21 may. 2019 a las 8:52, Edward Sawyer (<sawyered@earthlink.net>)
> escribió:
>
> > I agree with the 2 messages. But there is a 3rd. The inability for the
> > FT8 crowd to QSY around some interference. Interference is a fact of
> > life. And we have QSY’s around it (even as it is being worked) for a
> > century..
> >
> >
> >
> > Ed N1UR
> >
> >
> >
> > From: GEORGE WALLNER [mailto:aa7jv@atlanticbb..net]
> > Sent: Tuesday, May 21, 2019 7:50 AM
> > To: Edward Sawyer; topband@contesting.com
> > Subject: Re: Topband: AM interference on 1840
> >
> >
> >
> > There are two messages in this topic: One is the interference from this
> > particular BC station. Not a crisis, not yet. Two is a warning: Newly
> > installed solid-state AM broadcast amplifiers in poorly regulated
> regions,
> > over time, will have the potential to fill the entire 160 meter band with
> > harmonics. The second part is not trivial and should be a heads-up. The
> > earlier we find ways to deal with it, the better.
> >
> >
> >
> > 73,
> >
> > George,
> >
> > AA7JV
> >
> >
> >
> > On Tue, 21 May 2019 05:32:24 -0400
> >
> > "Edward Sawyer" <sawyered@earthlink.net> wrote:
> >
> > While the harmonic interference is unacceptable and needs to be dealt
> with,
> >
> > isn't this only "a crisis" because of the simplistic FT8 solution of
> >
> > bunching everyone up on a small channel? It reminds me of the old CB days
> >
> > when something would happen on a certain channel but no one would move
> >
> > because they have always had the radio on channel 2 and that's where all
> >
> > their buddies are. Or the 75M pig farmers that refuse to move but
> complain
> >
> > and harass on QRM that was there before their daily time started.
> >
> >
> >
> > For those of us using CW on topband, this isn't a real problem except
> for a
> >
> > contest weekend. And honestly, it will just get moved around, like the
> >
> > Middle East jammer on 3807.
> >
> >
> >
> > 73
> >
> >
> >
> > Ed N1UR
> >
> >
> >
> > _________________
> >
> > Searchable Archives: http://www.contesting.com/_topband - Topband
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> >
> >
> >
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
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> >
>
>
> --
> 73,
> Jorge
> CX6VM/CW5W
> _________________
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