Re: [Flexradio] Desensing of signal by AGC due to carrier?
Dale, I also submitted a tuneable notch filter to the enhancement list a few months ago. The way I envision it working is much the same way it works in MixW, Right click on an unwanted signal. A drop down box has as a selection: ADD NOTCH FILTER. Click on this. You can add other notch filters at other frequencies too. They are pretty narrow; I add two for a Pactor II signal or a RTTY signal. These notch filters are very effective in MixW for the digital modes but don't do anything for you on SSB. You might also get some relief by turning ACG off and reducing the RF gain control. If the front end is overloading, try turning the preamp off. 73, Chas W1CG. At 10:46 PM 1/7/2007, you wrote: Joe, I think the ANF only operates in the audio path after the AGC, so it doesn't actually eliminate the carrier from within the passband of the filter, although it does remove it from the audio output of the radio. However, a tunable, adjustable-width notch filter would solve this. About a year ago, another Flexer came up with a great concept, and unfortunately I do not remember who it was, although I remember his idea and terminology. His idea was to have the ability to slide a notch filter from either the left or right side of the panadapter display, and place it on top of an offending carrier. In fact, he used the analogy of having a 'quiver' of these notch filters available so that multiple notches could be implemented simply by dragging them into position. A great idea, in my opinion, and one which cw op's would also find useful, particularly those of us who prefer to use wider filter settings where the NR is more effective. 73, Dale WA8SRA Joe - AB1DO wrote: Hi all, I have noticed that when someone is tuning on top of a SSB signal, the strong carrier causes the AGC to cut down the volume, thus rendering a weak SSB signal all but inaudible. This is what I would expect, I guess However, when I activate ANF (Block LMS), the carrier's effect is killed, but the AGC keeps limiting the audio of the weak SSB signal, thus still rendering it barely audible. When the carrier itself disappears, the AGC increases audio again. Do others experience the same? Am I overlooking something, some setting? Can anything be done about this? Thanks for any help, 73 de Joe - AB1DO Configuration: Dell Dimension 4700 /w 3GHz P4 HT + 1GB DDR2 SDRAM + Intel 915G Express + XPHomeSP2 SDR-1000 + RFE + 100W PA Delta-44 + Break-out kit -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070107/f310a4b6/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
Re: [Flexradio] Desensing of signal by AGC due to carrier?
Dale, I have no issue with the ANF - it works superb. And I agree that an extension with manually tunable NFs would also have merrit. I'm just wondering if it is at all possible to have the ANF work before the AGC (Forgive me if I'm totally off base here as I have no idea what the current processing order is or even if it would make sense). That way, the AGC would work on the signal after the carrier has been filtered out and (most likely) leave the SSB signal alone. I understand that I can manually correct for it by turning AGC off and adjusting RF/AF, but that's several controls to manipulate, which all would need to be readjusted again when the carrier itself disappears. Just wondering if it could be avoided in the first place. 73 de Joe - AB1DO - Original Message - From: Dale Boresz [EMAIL PROTECTED] To: Joe - AB1DO [EMAIL PROTECTED] Cc: FlexRadio@flex-radio.biz Sent: Sunday, January 07, 2007 22:46 Subject: Re: [Flexradio] Desensing of signal by AGC due to carrier? Joe, I think the ANF only operates in the audio path after the AGC, so it doesn't actually eliminate the carrier from within the passband of the filter, although it does remove it from the audio output of the radio. However, a tunable, adjustable-width notch filter would solve this. About a year ago, another Flexer came up with a great concept, and unfortunately I do not remember who it was, although I remember his idea and terminology. His idea was to have the ability to slide a notch filter from either the left or right side of the panadapter display, and place it on top of an offending carrier. In fact, he used the analogy of having a 'quiver' of these notch filters available so that multiple notches could be implemented simply by dragging them into position. A great idea, in my opinion, and one which cw op's would also find useful, particularly those of us who prefer to use wider filter settings where the NR is more effective. 73, Dale WA8SRA Joe - AB1DO wrote: Hi all, I have noticed that when someone is tuning on top of a SSB signal, the strong carrier causes the AGC to cut down the volume, thus rendering a weak SSB signal all but inaudible. This is what I would expect, I guess However, when I activate ANF (Block LMS), the carrier's effect is killed, but the AGC keeps limiting the audio of the weak SSB signal, thus still rendering it barely audible. When the carrier itself disappears, the AGC increases audio again. Do others experience the same? Am I overlooking something, some setting? Can anything be done about this? Thanks for any help, 73 de Joe - AB1DO Configuration: Dell Dimension 4700 /w 3GHz P4 HT + 1GB DDR2 SDRAM + Intel 915G Express + XPHomeSP2 SDR-1000 + RFE + 100W PA Delta-44 + Break-out kit -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070107/f310a4b6/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
Re: [Flexradio] Desensing of signal by AGC due to carrier?
Dale, I also submitted a tuneable notch filter to the enhancement list a few months ago. The way I envision it working is much the same way it works in MixW, Right click on an unwanted signal. A drop down box has as a selection: ADD NOTCH FILTER. Click on this. You can add other notch filters at other frequencies too. They are pretty narrow; I add two for a Pactor II signal or a RTTY signal. These notch filters are very effective in MixW for the digital modes but don't do anything for you on SSB. Long ago and far away, before we had the external list, and probably before this reflector was established, I proposed a notch filter that worked on a drag and drop basis. It would stay on the frequency that the notch was deposited on. The scroll wheel could be used, if need be, to widen it up. The original listing had pictures which may or may not still show up if we could find the thread, which (I think) would have appeared on the original Flex web site. Larry WO0Z ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
Re: [Flexradio] Desensing of signal by AGC due to carrier?
Joe, I think the ANF only operates in the audio path after the AGC, so it doesn't actually eliminate the carrier from within the passband of the filter, although it does remove it from the audio output of the radio. However, a tunable, adjustable-width notch filter would solve this. About a year ago, another Flexer came up with a great concept, and unfortunately I do not remember who it was, although I remember his idea and terminology. His idea was to have the ability to slide a notch filter from either the left or right side of the panadapter display, and place it on top of an offending carrier. In fact, he used the analogy of having a 'quiver' of these notch filters available so that multiple notches could be implemented simply by dragging them into position. A great idea, in my opinion, and one which cw op's would also find useful, particularly those of us who prefer to use wider filter settings where the NR is more effective. 73, Dale WA8SRA Joe - AB1DO wrote: Hi all, I have noticed that when someone is tuning on top of a SSB signal, the strong carrier causes the AGC to cut down the volume, thus rendering a weak SSB signal all but inaudible. This is what I would expect, I guess However, when I activate ANF (Block LMS), the carrier's effect is killed, but the AGC keeps limiting the audio of the weak SSB signal, thus still rendering it barely audible. When the carrier itself disappears, the AGC increases audio again. Do others experience the same? Am I overlooking something, some setting? Can anything be done about this? Thanks for any help, 73 de Joe - AB1DO Configuration: Dell Dimension 4700 /w 3GHz P4 HT + 1GB DDR2 SDRAM + Intel 915G Express + XPHomeSP2 SDR-1000 + RFE + 100W PA Delta-44 + Break-out kit -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20070107/f310a4b6/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
