Topband: AM interference on 1840

Edward Sawyer sawyered at
Tue May 21 10:10:32 EDT 2019

Jorge.  I agree the harmonics are not acceptable.  But between fishing buoys and other birdie type QRN, moving around to find a clear frequency is not new to 160M, nor ham radio in general.  Its part of what we do.  As soon as something channelizes – its very limited quickly.


Ed  N1UR


From: Jorge Diez - CX6VM [mailto:cx6vm.jorge at] 
Sent: Tuesday, May 21, 2019 8:50 AM
To: Edward Sawyer
Subject: Re: Topband: AM interference on 1840




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






El mar., 21 may. 2019 a las 8:52, Edward Sawyer (<sawyered at>) 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] 
Sent: Tuesday, May 21, 2019 7:50 AM
To: Edward Sawyer; topband at
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.




On Tue, 21 May 2019 05:32:24 -0400

"Edward Sawyer" <sawyered at> 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.




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