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Author Topic: cw interfering with digital on 40 meters  (Read 1776 times)

Posts: 14

« on: February 19, 2010, 12:39:27 AM »

I am a licensed amateur radio operator.  I operate only cw and mainly on 40 meters  of which i am allowed to do according to my station license. I am very aware of band conditions and interference on 40 and all amateur bands and gosh knows we know there is interference. Operating  is on a shared basis and I understand that. Before operating on a given frequency  I listen and then transmit qrl several times listening in between to make sure I dont interfere with another station that i might not here or is not transmitting at the time but from time to time things do happen and I feel bad about that when it does. On February 7, 2010 AT 0255 utc on 7.076mhz  I sent qrl several times listening in between calls to make sure  i am not interfering with anyone. Hearing nothing I transmitted a cq and was answered by a WA6 station and we carried on a cw qso. A few days later I now have received from a OO that I was interfering with a NON FREQUENCY AGILE DIGITAL SYSTEM  that was already transmitting on that frequency. I never heard that station at all at any time before, during and after my qso. And if I cant hear the digital station then how do i know i am interfering with them. According to my license i can operate on 40 meters from 7025 to 7125 and i am going to continue to operate cw in the 40 meter band allocated for cw.. If however there has been a rule change from the FCC that I am not aware of  that I cant operate there then i will gladly qsy to a different frequency but for the time being  i am going to continue to work  in the frequncy  spectrun on 40 meters allocated to cw and  for those people who operate non frquency agile digital systems you are going to have to just get over it.  And the radio observer  who sent me the report if you were listeng to me send then why didnt you get on the air and tell me i was interfering with this non frequncy agile digital system or you just taking these peoples word for it.  It appears these people want a perfect operating scenario and they want their cake and coffee and what ever else they want.For me to stop sending and operating cw then some one is going to have to try and pry my hand off that cw key and it wont be someone who operates non frequncy agile digital systems for darn sure.

Posts: 109

« Reply #1 on: February 19, 2010, 11:02:42 AM »

Perhaps you should contact the OO and explain that you called qrl? and did not hear any signal on frequency, and ask why he thinks you were causing interference.

Posts: 114

« Reply #2 on: February 19, 2010, 10:00:01 PM »

40 meters is a nightmare for cw ops right now. Seem the digital guys like to come down to say 7.030 and just turn it on. Rude.. guess if it keeps up we will just reverse the band plan. All that room higher and some must go LOWER !

Posts: 5688

« Reply #3 on: February 20, 2010, 09:47:59 AM »

Perhaps you should contact the OO and explain that you called qrl? and did not hear any signal on frequency, and ask why he thinks you were causing interference.

That sounds to me like good advice. 

Posts: 14491

« Reply #4 on: February 20, 2010, 01:21:41 PM »

Obviously an automatic digital station is not going to copy your CW QRL and respond. Most likely some manual digital station unknowingly brought the automatic station up on top of your CQ. I wouldn't worry about it. Unlike an FCC notice, you are not required to provide any explanation to an OO.

Bob  AA4PB
Garrisonville, VA

Posts: 2129

« Reply #5 on: February 20, 2010, 03:42:47 PM »

Since you couldn't hear the digital station it is unlikely that the digital station could hear you either. So you probably wouldn't have been interfering with the digital station's reception at all.

The OO could hear both you and the digital station and yes you interfered with the OO's reception of the digital station but that is the nature of the beast on HF and NO offense has been committed by you. You aren't responsible for interference caused to the reception of other stations who are listening to stations that you can't even hear, especially since the aggrieved station couldn't even be bother to tell you of the interference that he was suffering.

Mark N1UK
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