Mike, In all FlexRadio models, AM is really an amplitude modulated 11 KHz carrier that is transmitted in SSB mode on exactly the same hardware signal chain as the SSB signals. In other words, AM is a SSB signal on both the 1000 and 5000. AM and SSB are both transmitted the same way from the digital to analog converter through the PA stages to the antenna. There is no hardware difference.
Gerald Gerald Youngblood, K5SDR President FlexRadio Systems 13091 Pond Springs Rd. #250 Austin, TX 78729 Phone: 512-535-4713 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, July 09, 2008 11:30 PM To: Maarten Cc: FlexRadio Reflector Subject: Re: [Flexradio] TX Audio Quality Help, please! Maarten, the abnormality is always there in all bandwidths in the ssb mode. The audio in the AM mode can best be described as superb. I think most of us have a desire to have the Flex line of radios to be the best that are out there in all parameters. Well, the ssb audio has a problem. There are many inside and outside the Flex company that have been and are in various forms of denial. You may be comfortable with that. However, as you can see from this reflector, there are many that hear the problem and would like to see a cure. Mike, K6ZSR Maarten wrote: > What does a comment "I can pick out a Flex 5000 audio at least 4 out > of 5 times" mean. I know people that can distinguish the difference in > sound between a Porsche vs a Ferari. For most people both cars sound > just like any other car. > Lets get real. I doubt anyone can pick out a Flex1000/5000 (or any > other rig)when the signal is less than S5. How about when there is QSB or QRM. > Do we really want the limited resources of the Flex developers spent > on some audio artifact that most of us can not hear or do not care > about if we hear it on someones signal. > I can come up with a list of 10 more important issues that I would > like to see improvements on. > 73 Maarten N1DZ > > BTW is this "abnormality" in the audio also audible when you use a > normal SSB bandwidth. > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > Sent: Wednesday, July 09, 2008 9:18 PM > To: FlexRadio Reflector > Subject: Re: [Flexradio] TX Audio Quality Help, please! > > I can pick out a Flex 5000 audio at least 4 out of 5 times. I proved > that when K6JCA ran a test. I would have caught the 5th one but > conditions deteriorated and it was difficult to hear the signal in its > totality. There is something definitely wrong going on with the rig as > concerns the audio. I can best describe it as a tearing sound on the > high audio frequencies. This is not RF getting into the audio. It is > definitely there and it is definitely not a local area thing. John, > W5GI has very nice full audio, no one can deny that - But John like > all other 5000 users, has that trademark audio tearing. Is this some > digital artifact creeping into the audio chain? - I don't know. It is > there and it isn't going away. I love my 5000 and I have sold my > FTdx9000a because I kept going back to the 5000 as my main rig, even > with the abnormality in the audio. I hope that there will be a fix to > the problem and I only wish I knew of someway to help other than to > describe what I and many many others hear on the signal. > > de Mike, K6ZSR > > > > > > > Jimmy Jones wrote: > >> Thank you >> Someone else can hear. >> I was beginning to wonder. >> >> >> On Tue, 2008-07-08 at 12:18 -0700, K6JEK wrote: >> >> >> >>> It not just Jeff. I'm one of the guys who've been listening to the >>> various audio tests. We first noticed something funny in someone >>> else's 5000 before Jeff even got his. We ran experiment after >>> experiment. This guy finally returned his for a refund. Then >>> another fellow (not in the local rag chew group) broke in with his >>> 5000 to say he's just waiting for someone to figure this out. His >>> 5000 had the same problem. We've been listening and recording with >>> a variety of equipment ranging from 1000's to direct conversion home brews. >>> >>> It is subtle. It might be rare. But it is not unique to JCA >>> >>> I think Jeff's nailed it. The audio up through the driver stage is >>> perfect. It gets funky in the final. Why and what to do about it >>> is another matter. >>> >>> Jon >>> >>> On Jul 7, 2008, at 8:52 PM, Jeff Anderson wrote: >>> >>> >>> >>>> I agree, it's peculiar. But again - if it's a leveler issue (i.e. >>>> software) I'd expect to hear it at the PA driver, too. But I don't >>>> (but perhaps others do? Ref: 1st half of 6 July test). By the >>>> way, I just checked, and the Leveler has been OFF (box not checked) >>>> for all of my tests. The only TX effect I have enabled is TX EQ, >>>> which is set to the same EQ values for all of my tests. >>>> >>>> What I wonder is this: can distortion at RF (rather than at AF) >>>> have this same "soft compression" effect, after the RF is demodulated? >>>> >>>> - Jeff >>>> >>>> Frank Brickle wrote: >>>> >>>> >>>>> On Mon, Jul 7, 2008 at 7:30 PM, Jeff Anderson >>>>> <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote: >>>>> >>>>> >>>>> Frank, I agree, I'm sure the distortion is not in the ADC/DAC >>>>> components >>>>> (nor software, nor input stages) either, because I don't hear it >>>>> at the >>>>> 5K PA's *driver stage* output, which is well after the output DAC >>>>> (ref: >>>>> 1st half of 6 July recording). The problem only pops up at >>>>> the output >>>>> of the *final* stage. >>>>> >>>>> >>>>> What's peculiar about the compression is that it's "soft," not >>>>> clipped. You have to wonder about the leveler settings. >>>>> >>>>> 73 >>>>> Frank >>>>> AB2KT >>>>> >>>>> -- >>>>> "Sapristi nabolis!" -- Count Jim Moriarty >>>>> >>>>> >>>> _______________________________________________ >>>> FlexRadio Systems Mailing List >>>> FlexRadio@flex-radio.biz >>>> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.bi >>>> z >>>> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >>>> Knowledge Base: http://kb.flex-radio.com/ Homepage: http:// >>>> www.flex-radio.com/ >>>> >>>> >>>> >>> _______________________________________________ >>> FlexRadio Systems Mailing List >>> FlexRadio@flex-radio.biz >>> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >>> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >>> Knowledge Base: http://kb.flex-radio.com/ Homepage: >>> > http://www.flex-radio.com/ > >>> >>> >> _______________________________________________ >> FlexRadio Systems Mailing List >> FlexRadio@flex-radio.biz >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >> Knowledge Base: http://kb.flex-radio.com/ Homepage: >> > http://www.flex-radio.com/ > >> >> > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > > > > > > > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
