Topband: [wsjtgroup] Re: AM interference on 1840

Tue May 21 16:47:55 EDT 2019

 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 at 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 at 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 at gmail.com

On May 21, 2019, at 3:23 PM, Paul Kiesel k7cw at yahoo.com [wsjtgroup] <wsjtgroup-noreply at 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 at 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 at 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 at gmail.com>
> To: Edward Sawyer <sawyered at earthlink.net>
> Cc: GEORGE WALLNER <aa7jv at atlanticbb.net>; TopBand List <
> topband at 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 at 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 at atlanticbb..net]
> > Sent: Tuesday, May 21, 2019 7:50 AM
> > To: Edward Sawyer; topband at 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 at 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
> > Reflector
> >
> >
> >
> > _________________
> > Searchable Archives: http://www.contesting.com/_topband - Topband
> > Reflector
> >
>
>
> --
> 73,
> Jorge
> CX6VM/CW5W
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

__._,_.___Posted by: Paul Kiesel <k7cw at yahoo.com>
| Reply via web post  | • | Reply to sender | • | Reply to group | • | Start a New Topic  | • | Messages in this topic (1)  |

Have you tried the highest rated email app?With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.To unsubscribe, send an email to:
wsjtgroup-unsubscribe at yahoogroups.comVisit Your Group  
• Privacy • Unsubscribe • Terms of Use 
SPONSORED LINKS.
__,_._,___

_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector