Re: [Flexradio] Question about TX harmonics
Mark, I no longer have your original message, but if the "spur" was 1.2 kHz as I recall, I'm wondering if you have a local AM broadcast station which may have mixed in your final. I have seen sum and difference products from local transmitters mixing in a transmitter result in "spurs". Sometimes it is a matter of running intermod calculations on the local transmitters, identifying what is getting into your PA and then filtering them to prevent further problems. I'm not say its one transmitter, it could be two or more or it may not even be a mixing problem... just a thought outside the box. 73 ES DX, Gary - AB9M On 11/25/2016 11:47 AM, Mark Lunday wrote: > Thanks Patrick. > > It was two stations about 700 miles away in different directions. > > Instead of harmonic, I should have said Spur. I shall open a ticket with > Flex. > > Mark Lunday, WD4ELG > Greensboro, NC FM06be > wd4...@arrl.net > http://wd4elg.blogspot.com > > > -Original Message- > From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of > Patrick Greenlee > Sent: Friday, November 25, 2016 8:27 AM > To: flexradio@flex-radio.biz > Subject: Re: [Flexradio] Question about TX harmonics > > Mark, Harmonics are integral multiples of your frequency so whatever was > happening it wasn't a harmonic of your signal. > > How close was the reporting station to your QTH? Strange things happen when > someone experiences fundamental overload of their receiver. If able, > arrange to have a look at your emissions on a good spectrum analyzer. It > might not be something you are emitting but something created in his > receiver. > > One time in the early 60's I was reported to the FCC as causing TVI. I had > a 2nd class licensee prepare a fact finding report in response to "The > Letter" from the FCC. I was putting out a very clean 3 Watts on the CB band > and the "ancient" TV I was interfering with had an IF with band width > covering the CB freqs. I was transmitting directly into one of the TV > receiver's IF circuits. Solution: Hey dude, get a more modern TV. End of > story. > > > > ___ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > To opt out of the Reflector: > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Re: [Flexradio] Question about TX harmonics
Mark, 1.2 kHz down would be an image response of your xmt signal if the sidetone frequency is the default value of 600 Hz -- as if the opposite sideband was not being suppressed. You did not say what type of radio. IF FLEX-1500, FLEX-3000, or FLEX-5000, try doing a reset to factory defaults. Starting with a clean database cures a myriad of ailments. 73, Ray, K9DUR http://k9dur.info ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Re: [Flexradio] Question about TX harmonics
Thanks Patrick. It was two stations about 700 miles away in different directions. Instead of harmonic, I should have said Spur. I shall open a ticket with Flex. Mark Lunday, WD4ELG Greensboro, NC FM06be wd4...@arrl.net http://wd4elg.blogspot.com -Original Message- From: FlexRadio [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Patrick Greenlee Sent: Friday, November 25, 2016 8:27 AM To: flexradio@flex-radio.biz Subject: Re: [Flexradio] Question about TX harmonics Mark, Harmonics are integral multiples of your frequency so whatever was happening it wasn't a harmonic of your signal. How close was the reporting station to your QTH? Strange things happen when someone experiences fundamental overload of their receiver. If able, arrange to have a look at your emissions on a good spectrum analyzer. It might not be something you are emitting but something created in his receiver. One time in the early 60's I was reported to the FCC as causing TVI. I had a 2nd class licensee prepare a fact finding report in response to "The Letter" from the FCC. I was putting out a very clean 3 Watts on the CB band and the "ancient" TV I was interfering with had an IF with band width covering the CB freqs. I was transmitting directly into one of the TV receiver's IF circuits. Solution: Hey dude, get a more modern TV. End of story. ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Re: [Flexradio] Question about TX harmonics
Mark, Harmonics are integral multiples of your frequency so whatever was happening it wasn't a harmonic of your signal. How close was the reporting station to your QTH? Strange things happen when someone experiences fundamental overload of their receiver. If able, arrange to have a look at your emissions on a good spectrum analyzer. It might not be something you are emitting but something created in his receiver. One time in the early 60's I was reported to the FCC as causing TVI. I had a 2nd class licensee prepare a fact finding report in response to "The Letter" from the FCC. I was putting out a very clean 3 Watts on the CB band and the "ancient" TV I was interfering with had an IF with band width covering the CB freqs. I was transmitting directly into one of the TV receiver's IF circuits. Solution: Hey dude, get a more modern TV. End of story. On 11/24/2016 11:44 PM, Mark Lunday wrote: I was attempting to break through the pileup for 5H1WW on 80 CW the other night. A ham emailed me the next morning and said he could hear a harmonic of my CW signal 1.2 kHz down from my main.which unfortunately was right on top of the DX station. This is the first time someone has told me about this, but I think I read somewhere about it happening to another ham on 160 meters. Does this sound familiar to anyone? How did you resolve it? I was running an amp at the time into an inverted L. Mark Lunday, WD4ELG Greensboro, NC FM06be wd4...@arrl.net http://wd4elg.blogspot.com ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
