Re: [Flexradio] Poor sideband suppression
Tim Ellison wrote: > Mel, > > The real Cadillac is Jensen > http://www.jensen-transformers.com/iso_aud.html > > > -Tim > --- > Integrated Technical Services > > "Too much of everything is just enough." > -Rob Barlow > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mel Whitten > Sent: Wednesday, September 27, 2006 1:39 PM > To: FlexRadio > Subject: Re: [Flexradio] Poor sideband suppression > > Here is a little blurb on these isolators if you prefer to build your > own. > They are simple, but some care should be taken when choosing the > transformer(s): > > http://www.tkk.fi/Misc/Electronics/circuits/audio_isolator.html > > and > > http://www.solorb.com/elect/musiccirc/stereoiso/index.html > > and if you prefer to buy more of a "Cadillac" model, MCM offers a > stereo isolator with 3 types of connectors: > > http://www.mcminone.com/product.asp?catalog%5Fname=MCMProducts&product%5 > Fid=555%2D7675 > > > Mel, K0PFX > > > > > - Original Message - > From: "Tim Ellison" <[EMAIL PROTECTED]> > To: "A.R.S. - W5AMI" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]> > Cc: "Flexradio" > Sent: Wednesday, September 27, 2006 12:14 PM > Subject: Re: [Flexradio] Poor sideband suppression > > >> The EBTech Hum Eliminator is good too. It will accept balanced or >> unbalanced connections and the frequency response id 20 to 70,000 Hz. >> >> >> -Tim >> --- >> Integrated Technical Services >> >> "Too much of everything is just enough." >> -Rob Barlow >> >> -Original Message- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of A.R.S. - W5AMI >> Sent: Wednesday, September 27, 2006 12:12 PM >> To: K6JEK >> Cc: Flexradio >> Subject: Re: [Flexradio] Poor sideband suppression >> >> Jon, >> >> Do you have any stereo 1:1 audio isolation xfmrs laying around? If > so, >> try inserting one between your presonus connections and the line-in > jack >> of the SDR-1000. Make sure whatever xfmr you use, it has a good flat >> audio curve. I use a Scosche car audio device: >> >> > http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 >> There are others like Jensen, Radio Shack, etc. >> >> This may not help, however it will not hurt, and if you ever run AM > with >> any outboard power, you might very likely need one, as there has been > a >> reported problem with an DSB image 11kcs below the transmitting freq. >> With this 1:1 isolation xfmr, that all goes away. >> >> Brian w5ami >> >> >> On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: >>> I started this thread about poor sideband suppression. Just so you >>> all know, this is not a case of poor cable connections, an avenue I >>> diligently explored. I do believe the stereo mini jacks leave >>> something to be desired but they are not the source of my opposite >>> sideband grunk >>> >>> Jon, K6EK >>> >>> On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: >>> >>>> I love Willi's practical approach to things. I mean it is not as > if >>>> we are attempting to preserve the beauty of this black box! I did >> exactly >>>> this on a radio I was having trouble with doing a demo. I do >> suspect >>>> that there are some who would feel uncomfortable removing the stack >>>> to drill the holes which is required to prevent damage to the >> connectors. >>>> But, this allowed the cheapest plug to seat properly and deox >>>> removed the microOhm resistance oxidization build up (my stinking >>>> greasy fingers and their acid "reflux" ). >>>> >>>> Bob >>>> N4HY >>>> >>>> >>>> Willi Reppel wrote: >>>>> Jeff, >>>>> >>>>> One possible cure to avoid said jiggling and twisting of the plugs >>>>> is to drill larger holes into the backplate of the SDR1000 >>>>> enclosure. The relatively small holes may prevent certain types of >>>>> male plugs to reach the bottom of the female connectors. >>>>> Gold-plated plugs here in the old countries have normally a larger >>>>> diameter than the holes. Also, the holes in the cabinet may not be >>>>> con-centric with the rings of the female
Re: [Flexradio] Poor sideband suppression
Mel, The real Cadillac is Jensen http://www.jensen-transformers.com/iso_aud.html -Tim --- Integrated Technical Services "Too much of everything is just enough." -Rob Barlow -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mel Whitten Sent: Wednesday, September 27, 2006 1:39 PM To: FlexRadio Subject: Re: [Flexradio] Poor sideband suppression Here is a little blurb on these isolators if you prefer to build your own. They are simple, but some care should be taken when choosing the transformer(s): http://www.tkk.fi/Misc/Electronics/circuits/audio_isolator.html and http://www.solorb.com/elect/musiccirc/stereoiso/index.html and if you prefer to buy more of a "Cadillac" model, MCM offers a stereo isolator with 3 types of connectors: http://www.mcminone.com/product.asp?catalog%5Fname=MCMProducts&product%5 Fid=555%2D7675 Mel, K0PFX - Original Message - From: "Tim Ellison" <[EMAIL PROTECTED]> To: "A.R.S. - W5AMI" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]> Cc: "Flexradio" Sent: Wednesday, September 27, 2006 12:14 PM Subject: Re: [Flexradio] Poor sideband suppression > The EBTech Hum Eliminator is good too. It will accept balanced or > unbalanced connections and the frequency response id 20 to 70,000 Hz. > > > -Tim > --- > Integrated Technical Services > > "Too much of everything is just enough." > -Rob Barlow > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of A.R.S. - W5AMI > Sent: Wednesday, September 27, 2006 12:12 PM > To: K6JEK > Cc: Flexradio > Subject: Re: [Flexradio] Poor sideband suppression > > Jon, > > Do you have any stereo 1:1 audio isolation xfmrs laying around? If so, > try inserting one between your presonus connections and the line-in jack > of the SDR-1000. Make sure whatever xfmr you use, it has a good flat > audio curve. I use a Scosche car audio device: > > http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 > > There are others like Jensen, Radio Shack, etc. > > This may not help, however it will not hurt, and if you ever run AM with > any outboard power, you might very likely need one, as there has been a > reported problem with an DSB image 11kcs below the transmitting freq. > With this 1:1 isolation xfmr, that all goes away. > > Brian w5ami > > > On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: >> I started this thread about poor sideband suppression. Just so you >> all know, this is not a case of poor cable connections, an avenue I >> diligently explored. I do believe the stereo mini jacks leave >> something to be desired but they are not the source of my opposite >> sideband grunk >> >> Jon, K6EK >> >> On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: >> >> > I love Willi's practical approach to things. I mean it is not as if > >> > we are attempting to preserve the beauty of this black box! I did > exactly >> > this on a radio I was having trouble with doing a demo. I do > suspect >> > that there are some who would feel uncomfortable removing the stack >> > to drill the holes which is required to prevent damage to the > connectors. >> > But, this allowed the cheapest plug to seat properly and deox >> > removed the microOhm resistance oxidization build up (my stinking >> > greasy fingers and their acid "reflux" ). >> > >> > Bob >> > N4HY >> > >> > >> > Willi Reppel wrote: >> >> Jeff, >> >> >> >> One possible cure to avoid said jiggling and twisting of the plugs >> >> is to drill larger holes into the backplate of the SDR1000 >> >> enclosure. The relatively small holes may prevent certain types of >> >> male plugs to reach the bottom of the female connectors. >> >> Gold-plated plugs here in the old countries have normally a larger >> >> diameter than the holes. Also, the holes in the cabinet may not be >> >> con-centric with the rings of the female connectors of the board >> >> stack and the larger holes I drilled make sure that the plugs are >> >> properly seated. No more jiggling here since a long time ago. >> >> >> >> 73 es gl >> >> SM6OMH Willi >> >> >> > >> > -- >> > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, >> > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You >> > see, wire telegraph is a kind of a very, very long cat. >> > You pull his
Re: [Flexradio] Poor sideband suppression
Here is a little blurb on these isolators if you prefer to build your own. They are simple, but some care should be taken when choosing the transformer(s): http://www.tkk.fi/Misc/Electronics/circuits/audio_isolator.html and http://www.solorb.com/elect/musiccirc/stereoiso/index.html and if you prefer to buy more of a "Cadillac" model, MCM offers a stereo isolator with 3 types of connectors: http://www.mcminone.com/product.asp?catalog%5Fname=MCMProducts&product%5Fid=555%2D7675 Mel, K0PFX - Original Message - From: "Tim Ellison" <[EMAIL PROTECTED]> To: "A.R.S. - W5AMI" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]> Cc: "Flexradio" Sent: Wednesday, September 27, 2006 12:14 PM Subject: Re: [Flexradio] Poor sideband suppression > The EBTech Hum Eliminator is good too. It will accept balanced or > unbalanced connections and the frequency response id 20 to 70,000 Hz. > > > -Tim > --- > Integrated Technical Services > > "Too much of everything is just enough." > -Rob Barlow > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of A.R.S. - W5AMI > Sent: Wednesday, September 27, 2006 12:12 PM > To: K6JEK > Cc: Flexradio > Subject: Re: [Flexradio] Poor sideband suppression > > Jon, > > Do you have any stereo 1:1 audio isolation xfmrs laying around? If so, > try inserting one between your presonus connections and the line-in jack > of the SDR-1000. Make sure whatever xfmr you use, it has a good flat > audio curve. I use a Scosche car audio device: > > http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 > > There are others like Jensen, Radio Shack, etc. > > This may not help, however it will not hurt, and if you ever run AM with > any outboard power, you might very likely need one, as there has been a > reported problem with an DSB image 11kcs below the transmitting freq. > With this 1:1 isolation xfmr, that all goes away. > > Brian w5ami > > > On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: >> I started this thread about poor sideband suppression. Just so you >> all know, this is not a case of poor cable connections, an avenue I >> diligently explored. I do believe the stereo mini jacks leave >> something to be desired but they are not the source of my opposite >> sideband grunk >> >> Jon, K6EK >> >> On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: >> >> > I love Willi's practical approach to things. I mean it is not as if > >> > we are attempting to preserve the beauty of this black box! I did > exactly >> > this on a radio I was having trouble with doing a demo. I do > suspect >> > that there are some who would feel uncomfortable removing the stack >> > to drill the holes which is required to prevent damage to the > connectors. >> > But, this allowed the cheapest plug to seat properly and deox >> > removed the microOhm resistance oxidization build up (my stinking >> > greasy fingers and their acid "reflux" ). >> > >> > Bob >> > N4HY >> > >> > >> > Willi Reppel wrote: >> >> Jeff, >> >> >> >> One possible cure to avoid said jiggling and twisting of the plugs >> >> is to drill larger holes into the backplate of the SDR1000 >> >> enclosure. The relatively small holes may prevent certain types of >> >> male plugs to reach the bottom of the female connectors. >> >> Gold-plated plugs here in the old countries have normally a larger >> >> diameter than the holes. Also, the holes in the cabinet may not be >> >> con-centric with the rings of the female connectors of the board >> >> stack and the larger holes I drilled make sure that the plugs are >> >> properly seated. No more jiggling here since a long time ago. >> >> >> >> 73 es gl >> >> SM6OMH Willi >> >> >> > >> > -- >> > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, >> > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You >> > see, wire telegraph is a kind of a very, very long cat. >> > You pull his tail in New York and his head is meowing in Los >> > Angeles. Do you understand this? And radio operates exactly the same > >> > way: you send signals here, they receive them there. >> > The only difference is that there is no cat." - Einstein >> > >> > >> > ___ >> > FlexRadio mailing l
Re: [Flexradio] Poor sideband suppression
The EBTech Hum Eliminator is good too. It will accept balanced or unbalanced connections and the frequency response id 20 to 70,000 Hz. -Tim --- Integrated Technical Services "Too much of everything is just enough." -Rob Barlow -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of A.R.S. - W5AMI Sent: Wednesday, September 27, 2006 12:12 PM To: K6JEK Cc: Flexradio Subject: Re: [Flexradio] Poor sideband suppression Jon, Do you have any stereo 1:1 audio isolation xfmrs laying around? If so, try inserting one between your presonus connections and the line-in jack of the SDR-1000. Make sure whatever xfmr you use, it has a good flat audio curve. I use a Scosche car audio device: http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 There are others like Jensen, Radio Shack, etc. This may not help, however it will not hurt, and if you ever run AM with any outboard power, you might very likely need one, as there has been a reported problem with an DSB image 11kcs below the transmitting freq. With this 1:1 isolation xfmr, that all goes away. Brian w5ami On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: > I started this thread about poor sideband suppression. Just so you > all know, this is not a case of poor cable connections, an avenue I > diligently explored. I do believe the stereo mini jacks leave > something to be desired but they are not the source of my opposite > sideband grunk > > Jon, K6EK > > On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: > > > I love Willi's practical approach to things. I mean it is not as if > > we are attempting to preserve the beauty of this black box! I did exactly > > this on a radio I was having trouble with doing a demo. I do suspect > > that there are some who would feel uncomfortable removing the stack > > to drill the holes which is required to prevent damage to the connectors. > > But, this allowed the cheapest plug to seat properly and deox > > removed the microOhm resistance oxidization build up (my stinking > > greasy fingers and their acid "reflux" ). > > > > Bob > > N4HY > > > > > > Willi Reppel wrote: > >> Jeff, > >> > >> One possible cure to avoid said jiggling and twisting of the plugs > >> is to drill larger holes into the backplate of the SDR1000 > >> enclosure. The relatively small holes may prevent certain types of > >> male plugs to reach the bottom of the female connectors. > >> Gold-plated plugs here in the old countries have normally a larger > >> diameter than the holes. Also, the holes in the cabinet may not be > >> con-centric with the rings of the female connectors of the board > >> stack and the larger holes I drilled make sure that the plugs are > >> properly seated. No more jiggling here since a long time ago. > >> > >> 73 es gl > >> SM6OMH Willi > >> > > > > -- > > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, > > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You > > see, wire telegraph is a kind of a very, very long cat. > > You pull his tail in New York and his head is meowing in Los > > Angeles. Do you understand this? And radio operates exactly the same > > way: you send signals here, they receive them there. > > The only difference is that there is no cat." - Einstein > > > > > > ___ > > 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 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 > -- "There is nothing more uncommon than common sense." -- Frank Lloyd Wright ___ 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 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
Re: [Flexradio] Poor sideband suppression
BTW, if you do install one of these, be sure to re-calibrate as it might either reduce or increase the voltages going to line-in slightly. On 9/27/06, Jeff Anderson <[EMAIL PROTECTED]> wrote: > If there's a Radio Shack nearby, they also sell > ground-loop isolators: > > http://www.radioshack.com/product/index.jsp?productId=2062214 > > - Jeff, K6jca > > --- "A.R.S. - W5AMI" <[EMAIL PROTECTED]> wrote: > > > Jon, > > > > Do you have any stereo 1:1 audio isolation xfmrs > > laying around? If > > so, try inserting one between your presonus > > connections and the > > line-in jack of the SDR-1000. Make sure whatever > > xfmr you use, it has > > a good flat audio curve. I use a Scosche car audio > > device: > > > > > http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 > > > > There are others like Jensen, Radio Shack, etc. > > > > This may not help, however it will not hurt, and if > > you ever run AM > > with any outboard power, you might very likely need > > one, as there has > > been a reported problem with an DSB image 11kcs > > below the transmitting > > freq. With this 1:1 isolation xfmr, that all goes > > away. > > > > Brian w5ami > > > > > > On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: > > > I started this thread about poor sideband > > suppression. Just so you > > > all know, this is not a case of poor cable > > connections, an avenue I > > > diligently explored. I do believe the stereo > > mini jacks leave > > > something to be desired but they are not the > > source of my opposite > > > sideband grunk > > > > > > Jon, K6EK > > > > > > On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: > > > > > > > I love Willi's practical approach to things. I > > mean it is not as if we > > > > are attempting to preserve the beauty of this > > black box! I did exactly > > > > this on a radio I was having trouble with doing > > a demo. I do suspect > > > > that there are some who would feel uncomfortable > > removing the stack to > > > > drill the holes which is required to prevent > > damage to the connectors. > > > > But, this allowed the cheapest plug to seat > > properly and deox removed > > > > the microOhm resistance oxidization build up (my > > stinking greasy > > > > fingers > > > > and their acid "reflux" ). > > > > > > > > Bob > > > > N4HY > > > > > > > > > > > > Willi Reppel wrote: > > > >> Jeff, > > > >> > > > >> One possible cure to avoid said jiggling and > > twisting of the plugs is > > > >> to > > > >> drill larger holes into the backplate of the > > SDR1000 enclosure. The > > > >> relatively small holes may prevent certain > > types of male plugs to > > > >> reach the > > > >> bottom of the female connectors. Gold-plated > > plugs here in the old > > > >> countries > > > >> have normally a larger diameter than the holes. > > Also, the holes in the > > > >> cabinet may not be con-centric with the rings > > of the female > > > >> connectors of > > > >> the board stack and the larger holes I drilled > > make sure that the > > > >> plugs are > > > >> properly seated. No more jiggling here since a > > long time ago. > > > >> > > > >> 73 es gl > > > >> SM6OMH Willi > > > >> > > > > > > > > -- > > > > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, > > TAPR, Packrats, > > > > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk > > Grp Chairman > > > > "You see, wire telegraph is a kind of a very, > > very long cat. > > > > You pull his tail in New York and his head is > > meowing in Los > > > > Angeles. Do you understand this? And radio > > operates exactly > > > > the same way: you send signals here, they > > receive them there. > > > > The only difference is that there is no cat." - > > Einstein > > > > > > > > > > > > ___ > > > > 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 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 > > > > > > > > > -- > > "There is nothing more uncommon than common sense." > > -- Frank Lloyd Wright > > > > ___ > > 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 > > > > -- "There is nothing more uncommon than common sense." -- Frank Lloyd Wright ___ FlexRadio mailing list FlexRadio@flex-radio.
Re: [Flexradio] Poor sideband suppression
If there's a Radio Shack nearby, they also sell ground-loop isolators: http://www.radioshack.com/product/index.jsp?productId=2062214 - Jeff, K6jca --- "A.R.S. - W5AMI" <[EMAIL PROTECTED]> wrote: > Jon, > > Do you have any stereo 1:1 audio isolation xfmrs > laying around? If > so, try inserting one between your presonus > connections and the > line-in jack of the SDR-1000. Make sure whatever > xfmr you use, it has > a good flat audio curve. I use a Scosche car audio > device: > > http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 > > There are others like Jensen, Radio Shack, etc. > > This may not help, however it will not hurt, and if > you ever run AM > with any outboard power, you might very likely need > one, as there has > been a reported problem with an DSB image 11kcs > below the transmitting > freq. With this 1:1 isolation xfmr, that all goes > away. > > Brian w5ami > > > On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: > > I started this thread about poor sideband > suppression. Just so you > > all know, this is not a case of poor cable > connections, an avenue I > > diligently explored. I do believe the stereo > mini jacks leave > > something to be desired but they are not the > source of my opposite > > sideband grunk > > > > Jon, K6EK > > > > On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: > > > > > I love Willi's practical approach to things. I > mean it is not as if we > > > are attempting to preserve the beauty of this > black box! I did exactly > > > this on a radio I was having trouble with doing > a demo. I do suspect > > > that there are some who would feel uncomfortable > removing the stack to > > > drill the holes which is required to prevent > damage to the connectors. > > > But, this allowed the cheapest plug to seat > properly and deox removed > > > the microOhm resistance oxidization build up (my > stinking greasy > > > fingers > > > and their acid "reflux" ). > > > > > > Bob > > > N4HY > > > > > > > > > Willi Reppel wrote: > > >> Jeff, > > >> > > >> One possible cure to avoid said jiggling and > twisting of the plugs is > > >> to > > >> drill larger holes into the backplate of the > SDR1000 enclosure. The > > >> relatively small holes may prevent certain > types of male plugs to > > >> reach the > > >> bottom of the female connectors. Gold-plated > plugs here in the old > > >> countries > > >> have normally a larger diameter than the holes. > Also, the holes in the > > >> cabinet may not be con-centric with the rings > of the female > > >> connectors of > > >> the board stack and the larger holes I drilled > make sure that the > > >> plugs are > > >> properly seated. No more jiggling here since a > long time ago. > > >> > > >> 73 es gl > > >> SM6OMH Willi > > >> > > > > > > -- > > > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, > TAPR, Packrats, > > > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk > Grp Chairman > > > "You see, wire telegraph is a kind of a very, > very long cat. > > > You pull his tail in New York and his head is > meowing in Los > > > Angeles. Do you understand this? And radio > operates exactly > > > the same way: you send signals here, they > receive them there. > > > The only difference is that there is no cat." - > Einstein > > > > > > > > > ___ > > > 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 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 > > > > > -- > "There is nothing more uncommon than common sense." > -- Frank Lloyd Wright > > ___ > 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 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
Re: [Flexradio] Poor sideband suppression
Jon, Do you have any stereo 1:1 audio isolation xfmrs laying around? If so, try inserting one between your presonus connections and the line-in jack of the SDR-1000. Make sure whatever xfmr you use, it has a good flat audio curve. I use a Scosche car audio device: http://www.scosche.com/scosche_caraudio.aspx?CategoryID=33&ItemID=ES034 There are others like Jensen, Radio Shack, etc. This may not help, however it will not hurt, and if you ever run AM with any outboard power, you might very likely need one, as there has been a reported problem with an DSB image 11kcs below the transmitting freq. With this 1:1 isolation xfmr, that all goes away. Brian w5ami On 9/27/06, K6JEK <[EMAIL PROTECTED]> wrote: > I started this thread about poor sideband suppression. Just so you > all know, this is not a case of poor cable connections, an avenue I > diligently explored. I do believe the stereo mini jacks leave > something to be desired but they are not the source of my opposite > sideband grunk > > Jon, K6EK > > On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: > > > I love Willi's practical approach to things. I mean it is not as if we > > are attempting to preserve the beauty of this black box! I did exactly > > this on a radio I was having trouble with doing a demo. I do suspect > > that there are some who would feel uncomfortable removing the stack to > > drill the holes which is required to prevent damage to the connectors. > > But, this allowed the cheapest plug to seat properly and deox removed > > the microOhm resistance oxidization build up (my stinking greasy > > fingers > > and their acid "reflux" ). > > > > Bob > > N4HY > > > > > > Willi Reppel wrote: > >> Jeff, > >> > >> One possible cure to avoid said jiggling and twisting of the plugs is > >> to > >> drill larger holes into the backplate of the SDR1000 enclosure. The > >> relatively small holes may prevent certain types of male plugs to > >> reach the > >> bottom of the female connectors. Gold-plated plugs here in the old > >> countries > >> have normally a larger diameter than the holes. Also, the holes in the > >> cabinet may not be con-centric with the rings of the female > >> connectors of > >> the board stack and the larger holes I drilled make sure that the > >> plugs are > >> properly seated. No more jiggling here since a long time ago. > >> > >> 73 es gl > >> SM6OMH Willi > >> > > > > -- > > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, > > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman > > "You see, wire telegraph is a kind of a very, very long cat. > > You pull his tail in New York and his head is meowing in Los > > Angeles. Do you understand this? And radio operates exactly > > the same way: you send signals here, they receive them there. > > The only difference is that there is no cat." - Einstein > > > > > > ___ > > 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 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 > -- "There is nothing more uncommon than common sense." -- Frank Lloyd Wright ___ 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
Re: [Flexradio] Poor sideband suppression
Good Morning All, Just home for a minute. I suspect I have the same problem but need to retest. I had carrier level of only -30 dB and TX CW LSB of -40, Right after setting up the TX rejection with the built-in tone on an Agilent Spectrum Analyzer of recent vintage . I have to repeat it all Barry VE4MA - Original Message - From: "K6JEK" <[EMAIL PROTECTED]> To: "Flexradio" Sent: Wednesday, September 27, 2006 10:42 AM Subject: Re: [Flexradio] Poor sideband suppression >I started this thread about poor sideband suppression. Just so you > all know, this is not a case of poor cable connections, an avenue I > diligently explored. I do believe the stereo mini jacks leave > something to be desired but they are not the source of my opposite > sideband grunk > > Jon, K6EK > > On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: > >> I love Willi's practical approach to things. I mean it is not as if we >> are attempting to preserve the beauty of this black box! I did exactly >> this on a radio I was having trouble with doing a demo. I do suspect >> that there are some who would feel uncomfortable removing the stack to >> drill the holes which is required to prevent damage to the connectors. >> But, this allowed the cheapest plug to seat properly and deox removed >> the microOhm resistance oxidization build up (my stinking greasy >> fingers >> and their acid "reflux" ). >> >> Bob >> N4HY >> >> >> Willi Reppel wrote: >>> Jeff, >>> >>> One possible cure to avoid said jiggling and twisting of the plugs is >>> to >>> drill larger holes into the backplate of the SDR1000 enclosure. The >>> relatively small holes may prevent certain types of male plugs to >>> reach the >>> bottom of the female connectors. Gold-plated plugs here in the old >>> countries >>> have normally a larger diameter than the holes. Also, the holes in the >>> cabinet may not be con-centric with the rings of the female >>> connectors of >>> the board stack and the larger holes I drilled make sure that the >>> plugs are >>> properly seated. No more jiggling here since a long time ago. >>> >>> 73 es gl >>> SM6OMH Willi >>> >> >> -- >> AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, >> NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman >> "You see, wire telegraph is a kind of a very, very long cat. >> You pull his tail in New York and his head is meowing in Los >> Angeles. Do you understand this? And radio operates exactly >> the same way: you send signals here, they receive them there. >> The only difference is that there is no cat." - Einstein >> >> >> ___ >> 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 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 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
Re: [Flexradio] Poor sideband suppression
I started this thread about poor sideband suppression. Just so you all know, this is not a case of poor cable connections, an avenue I diligently explored. I do believe the stereo mini jacks leave something to be desired but they are not the source of my opposite sideband grunk Jon, K6EK On Sep 27, 2006, at 8:05 AM, Robert McGwier wrote: > I love Willi's practical approach to things. I mean it is not as if we > are attempting to preserve the beauty of this black box! I did exactly > this on a radio I was having trouble with doing a demo. I do suspect > that there are some who would feel uncomfortable removing the stack to > drill the holes which is required to prevent damage to the connectors. > But, this allowed the cheapest plug to seat properly and deox removed > the microOhm resistance oxidization build up (my stinking greasy > fingers > and their acid "reflux" ). > > Bob > N4HY > > > Willi Reppel wrote: >> Jeff, >> >> One possible cure to avoid said jiggling and twisting of the plugs is >> to >> drill larger holes into the backplate of the SDR1000 enclosure. The >> relatively small holes may prevent certain types of male plugs to >> reach the >> bottom of the female connectors. Gold-plated plugs here in the old >> countries >> have normally a larger diameter than the holes. Also, the holes in the >> cabinet may not be con-centric with the rings of the female >> connectors of >> the board stack and the larger holes I drilled make sure that the >> plugs are >> properly seated. No more jiggling here since a long time ago. >> >> 73 es gl >> SM6OMH Willi >> > > -- > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman > "You see, wire telegraph is a kind of a very, very long cat. > You pull his tail in New York and his head is meowing in Los > Angeles. Do you understand this? And radio operates exactly > the same way: you send signals here, they receive them there. > The only difference is that there is no cat." - Einstein > > > ___ > 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 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
Re: [Flexradio] Poor sideband suppression
I love Willi's practical approach to things. I mean it is not as if we are attempting to preserve the beauty of this black box! I did exactly this on a radio I was having trouble with doing a demo. I do suspect that there are some who would feel uncomfortable removing the stack to drill the holes which is required to prevent damage to the connectors. But, this allowed the cheapest plug to seat properly and deox removed the microOhm resistance oxidization build up (my stinking greasy fingers and their acid "reflux" ). Bob N4HY Willi Reppel wrote: > Jeff, > > One possible cure to avoid said jiggling and twisting of the plugs is to > drill larger holes into the backplate of the SDR1000 enclosure. The > relatively small holes may prevent certain types of male plugs to reach the > bottom of the female connectors. Gold-plated plugs here in the old countries > have normally a larger diameter than the holes. Also, the holes in the > cabinet may not be con-centric with the rings of the female connectors of > the board stack and the larger holes I drilled make sure that the plugs are > properly seated. No more jiggling here since a long time ago. > > 73 es gl > SM6OMH Willi > -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Einstein ___ 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
Re: [Flexradio] Poor sideband suppression
Mike, Good suggestion, but less useful for those who use gold-plated plugs in solid brass. Willi - Original Message - From: "Mike Naruta" <[EMAIL PROTECTED]> To: "'FlexRadio Mailing List'" Sent: Tuesday, September 26, 2006 6:07 PM Subject: Re: [Flexradio] Poor sideband suppression > Rather than enlarge the hole, I used a > knife to shave the plastic on the plug end. > > > Mike - AA8K > > > > Willi Reppel wrote: >> Larry, >> >> To the best of my knowledge, I cannot recall an offi-cial warning from >> Flex.Radio against the use of gold-plated plugs. In contrary, these were >> praised many times as problem solvers on the forum and reflector without >> objections. Anyhow, they solved my problems and twisting is now done only >> on >> dance floors. To avoid the introduction of new problems, I mentioned the >> required enlargement of the connector admission holes when using >> gold-plated >> plugs. >> >> vy 73 es best dx de SM6OMH Willi > > ___ > 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 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
Re: [Flexradio] Poor sideband suppression
Rather than enlarge the hole, I used a knife to shave the plastic on the plug end. Mike - AA8K Willi Reppel wrote: > Larry, > > To the best of my knowledge, I cannot recall an offi-cial warning from > Flex.Radio against the use of gold-plated plugs. In contrary, these were > praised many times as problem solvers on the forum and reflector without > objections. Anyhow, they solved my problems and twisting is now done only on > dance floors. To avoid the introduction of new problems, I mentioned the > required enlargement of the connector admission holes when using gold-plated > plugs. > > vy 73 es best dx de SM6OMH Willi ___ 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
Re: [Flexradio] Poor sideband suppression
Larry, To the best of my knowledge, I cannot recall an offi-cial warning from Flex.Radio against the use of gold-plated plugs. In contrary, these were praised many times as problem solvers on the forum and reflector without objections. Anyhow, they solved my problems and twisting is now done only on dance floors. To avoid the introduction of new problems, I mentioned the required enlargement of the connector admission holes when using gold-plated plugs. vy 73 es best dx de SM6OMH Willi - Original Message - From: "Larry Loen" <[EMAIL PROTECTED]> To: "Willi Reppel" <[EMAIL PROTECTED]> Cc: "Jeff Anderson" <[EMAIL PROTECTED]>; "Mike King - KM0T" <[EMAIL PROTECTED]>; "'FlexRadio Mailing List'" Sent: Tuesday, September 26, 2006 3:33 PM Subject: Re: [Flexradio] Poor sideband suppression > Willi Reppel wrote: > >>Jeff, >> >>One possible cure to avoid said jiggling and twisting of the plugs is to >>drill larger holes into the backplate of the SDR1000 enclosure. The >>relatively small holes may prevent certain types of male plugs to reach >>the bottom of the female connectors. Gold-plated plugs here in the old >>countries have normally a larger diameter than the holes. Also, the holes >>in the cabinet may not be con-centric with the rings of the female >>connectors of the board stack and the larger holes I drilled make sure >>that the plugs are properly seated. No more jiggling here since a long >>time ago. >> >>73 es gl >>SM6OMH Willi >> >> > > IIRC, actually, gold plugs are NOT recommended for this product precisely > because they are oversized. > > > 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
Re: [Flexradio] Poor sideband suppression
Willi Reppel wrote: >Jeff, > >One possible cure to avoid said jiggling and twisting of the plugs is to >drill larger holes into the backplate of the SDR1000 enclosure. The >relatively small holes may prevent certain types of male plugs to reach the >bottom of the female connectors. Gold-plated plugs here in the old countries >have normally a larger diameter than the holes. Also, the holes in the >cabinet may not be con-centric with the rings of the female connectors of >the board stack and the larger holes I drilled make sure that the plugs are >properly seated. No more jiggling here since a long time ago. > >73 es gl >SM6OMH Willi > > > IIRC, actually, gold plugs are NOT recommended for this product precisely because they are oversized. 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
Re: [Flexradio] Poor sideband suppression
Jeff, That is exactly my thought. Have Jon do a two tone transmit at max power from his QTH to yours and see what the spectrum looks like on your panadapter. Have Jon keep the transmission to a few seconds. Tom W0IVJ Original Message: - From: Jeff Anderson [EMAIL PROTECTED] Date: Mon, 25 Sep 2006 11:22:16 -0700 (PDT) To: [EMAIL PROTECTED], [EMAIL PROTECTED], flexradio@flex-radio.biz Subject: Re: [Flexradio] Poor sideband suppression Hi Gerald, I don't think Jon's problem is one of TX Image Rejection. We nulled it down at least 70 dB using the procedure in the manual. But we're still seeing grunge on the opposite sideband. If I listen to that sideband on another receiver, it doesn't sound like a clear voice (as I would expect if, say, there was an I/Q imbalance that would produce sort of a DSB effect). Instead, it kind of sounds like SSB when you receive it in AM mode - you can tell it's a voice, sort of, but it sounds very very bad. My current hypothesis is that it might be PA IMD. Wish I'd looked at the spectrum pre-PA (at the QRP Output connector) yesterday when we had it on the bench, rather than looking only at the output post-PA. - Jeff, K6JCA. --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: > There is a procedure for Transmit Image Rejection > management on the bottom of page 90 of the manual. > It worked for me but I'm using a Delta 44. The > section was rewritten by Eric but not published yet. > Just use another trusted receiver, tune it to the > same frequency but the apposite side band and adjust > the SDR slider controls to surpress it. > > K6JEK <[EMAIL PROTECTED]> wrote: Here is an update > on the poor sideband suppression from my SDR-1000. > It is putting significant energy out on the wrong > sideband, visible in > the panadapter of a nearby fellow Flexer and audible > by not so nearby > hams listening on the opposite sideband. > > Yesterday I took the radio over to Jeff, K6JCA's, > impressive lab. > Together we used as many pieces of test equipment as > we could think of > -- HP spectrum analyzers, lab grade audio spectrum > analyzers, signal > generators, and most effectively of all Jeff's SDR > 1000 to see what was > happening with mine. We haven't completely solved > the problem. But > here are the weekend's revelations: > > 1) It not the opposite sideband. Listening on the > opposite sideband > sounds like SSB through an AM detector > 2) Wide band noise was coming out of the Firebox. > The little filter > on the line-out line knocked it way back. > 3) Audio coming out of the Firebox looked really > good on the lab grade > audio spectrum analyzer -- brick wall, no funny > business -120 dBV > noise floor (with the filter) > 4) Careful adjustment of the TX Image dropped the > opposite sideband > signal by quite a bit, 10 - 20 dB > 5) Jeff's radio has some of the funny opposite side > signal too > 6) Jeff has too much stuff > 7) Two hams can spend an afternoon pushing RF > between radios and not > blow anything up > > ___ 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 mail2web - Check your email from the web at http://mail2web.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
Re: [Flexradio] Poor sideband suppression
Jeff, One possible cure to avoid said jiggling and twisting of the plugs is to drill larger holes into the backplate of the SDR1000 enclosure. The relatively small holes may prevent certain types of male plugs to reach the bottom of the female connectors. Gold-plated plugs here in the old countries have normally a larger diameter than the holes. Also, the holes in the cabinet may not be con-centric with the rings of the female connectors of the board stack and the larger holes I drilled make sure that the plugs are properly seated. No more jiggling here since a long time ago. 73 es gl SM6OMH Willi - Original Message - From: "Jeff Anderson" <[EMAIL PROTECTED]> To: "Mike King - KM0T" <[EMAIL PROTECTED]>; "'FlexRadio Mailing List'" Sent: Tuesday, September 26, 2006 1:00 AM Subject: Re: [Flexradio] Poor sideband suppression > Hi Mike, > > Thanks for the comment. > > Yes, we also jiggled & twisted the 3.5 mm plugs - the image rejection > settings are *very* sensitive to the connection between these jacks and > plugs, and we observed that if you even looked at them cross-eyed, the > null > settings would change. > > Although I love my SDR1K (it's the only radio I use now, despite a shack > full of rigs), if there's one thing I'd change about its design, it's the > use of those jacks. Very cheap feel (plugs do not fit snugly). In fact, > unless I position the plug from my morse key in the key jack *just right*, > the radio will automatically go into Transmit when I select CW mode. Very > annoying. > > Thanks again, > > - Jeff, K6JCA > > > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Mike King - KM0T > Sent: Monday, September 25, 2006 1:10 PM > To: 'FlexRadio Mailing List' > Subject: Re: [Flexradio] Poor sideband suppression > > > Hi guys, this may or may not be a solution, and I know it has been beaten > to > death...but I too experienced this same thing over the weekend while I was > helping a fellow with his SDR-1000. > > He brought his system over and we got it all set up. Going back and forth > between our two systems and looking at each others signals, we too saw > this > opposite sideband or whatever it is come and go. We also saw an opposite > CW > single in that mode. > > After much messing around, we both pulled out, plugged in and twisted a > number of times over our 3.5mm jacks on the back of the SDR-1000 for the > delta 44 breakout box, and the opposite side signals went away. > > We did not mess with the TX rejection controls whatsoever... > > 73 & GL > > Mike - KM0T > > > - Original Message - > From: "Jeff Anderson" <[EMAIL PROTECTED]> > To: "Gerald Capodieci" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]>; > > Sent: Monday, September 25, 2006 1:22 PM > Subject: Re: [Flexradio] Poor sideband suppression > > >> Hi Gerald, >> >> I don't think Jon's problem is one of TX Image >> Rejection. We nulled it down at least 70 dB using the >> procedure in the manual. But we're still seeing >> grunge on the opposite sideband. If I listen to that >> sideband on another receiver, it doesn't sound like a >> clear voice (as I would expect if, say, there was an >> I/Q imbalance that would produce sort of a DSB >> effect). Instead, it kind of sounds like SSB when you >> receive it in AM mode - you can tell it's a voice, >> sort of, but it sounds very very bad. >> >> My current hypothesis is that it might be PA IMD. >> Wish I'd looked at the spectrum pre-PA (at the QRP >> Output connector) yesterday when we had it on the >> bench, rather than looking only at the output post-PA. >> >> - Jeff, K6JCA. >> >> >> >> --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: >> >>> There is a procedure for Transmit Image Rejection >>> management on the bottom of page 90 of the manual. >>> It worked for me but I'm using a Delta 44. The >>> section was rewritten by Eric but not published yet. >>> Just use another trusted receiver, tune it to the >>> same frequency but the apposite side band and adjust >>> the SDR slider controls to surpress it. >>> >>> K6JEK <[EMAIL PROTECTED]> wrote: Here is an update >>> on the poor sideband suppression from my SDR-1000. >>> It is putting significant energy out on the wrong >>> sideband, visible in >>> the panadapter of a nearby fellow Flexer and audible >>> by not so nearby
Re: [Flexradio] Poor sideband suppression
DeoxIT Gold works wonders on 3.5mm plugs. I use it on 1/4" and RCA phonos as well. Radio Shack was practically giving it away in a sale they had a couple months ago. http://www.caig.com/ You only need a very, very small amount. It is a techs secrete weapon. This "stuff" has been around years... a rep for the company has had a booth at Dayton for the past few years. Another thing can help... use a clean "rag" and clean/polish the plugs with great vigor. If they have sat around for a while (or even new), plugs can accumulate a "film" on them. RCA and even 1/4" plugs should be cleaned/polished too. Since some of these plugs work at low levels, a little "care and feeding" will reduce unwanted contact resistance. Generally, the 3.5mm plugs are "made the same", but not always. Slight differences in "tip" length (distance between the tip and ring) can vary and same for the ring. Even the diameter can vary. As a result, the mating surfaces suffer and so goes the reliability. Gold is not always the answer either. You may find a gold plug but it rarely will it mate with a mating gold jack. Care must taken for some contacts not to mix gold with other metals, such as tin. But, DeoxIT will take care of this also. :-) Mel, K0PFX - Original Message - From: "Jeff Anderson" <[EMAIL PROTECTED]> To: "Mike King - KM0T" <[EMAIL PROTECTED]>; "'FlexRadio Mailing List'" Sent: Monday, September 25, 2006 6:00 PM Subject: Re: [Flexradio] Poor sideband suppression > Hi Mike, > > Thanks for the comment. > > Yes, we also jiggled & twisted the 3.5 mm plugs - the image rejection > settings are *very* sensitive to the connection between these jacks and > plugs, and we observed that if you even looked at them cross-eyed, the > null > settings would change. > > Although I love my SDR1K (it's the only radio I use now, despite a shack > full of rigs), if there's one thing I'd change about its design, it's the > use of those jacks. Very cheap feel (plugs do not fit snugly). In fact, > unless I position the plug from my morse key in the key jack *just right*, > the radio will automatically go into Transmit when I select CW mode. Very > annoying. > > Thanks again, > > - Jeff, K6JCA > > > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Mike King - KM0T > Sent: Monday, September 25, 2006 1:10 PM > To: 'FlexRadio Mailing List' > Subject: Re: [Flexradio] Poor sideband suppression > > > Hi guys, this may or may not be a solution, and I know it has been beaten > to > death...but I too experienced this same thing over the weekend while I was > helping a fellow with his SDR-1000. > > He brought his system over and we got it all set up. Going back and forth > between our two systems and looking at each others signals, we too saw > this > opposite sideband or whatever it is come and go. We also saw an opposite > CW > single in that mode. > > After much messing around, we both pulled out, plugged in and twisted a > number of times over our 3.5mm jacks on the back of the SDR-1000 for the > delta 44 breakout box, and the opposite side signals went away. > > We did not mess with the TX rejection controls whatsoever... > > 73 & GL > > Mike - KM0T > > > - Original Message - > From: "Jeff Anderson" <[EMAIL PROTECTED]> > To: "Gerald Capodieci" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]>; > > Sent: Monday, September 25, 2006 1:22 PM > Subject: Re: [Flexradio] Poor sideband suppression > > >> Hi Gerald, >> >> I don't think Jon's problem is one of TX Image >> Rejection. We nulled it down at least 70 dB using the >> procedure in the manual. But we're still seeing >> grunge on the opposite sideband. If I listen to that >> sideband on another receiver, it doesn't sound like a >> clear voice (as I would expect if, say, there was an >> I/Q imbalance that would produce sort of a DSB >> effect). Instead, it kind of sounds like SSB when you >> receive it in AM mode - you can tell it's a voice, >> sort of, but it sounds very very bad. >> >> My current hypothesis is that it might be PA IMD. >> Wish I'd looked at the spectrum pre-PA (at the QRP >> Output connector) yesterday when we had it on the >> bench, rather than looking only at the output post-PA. >> >> - Jeff, K6JCA. >> >> >> >> --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: >> >>> There is a procedure for Transmit Image Rejection
Re: [Flexradio] Poor sideband suppression
DeoxIT! Mike is someone that I trust due to his technical prowess. For whatever reason, the very small contact resistance and the few microvolts developed across it and the rectification process causes problems with these interconnects. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike King - KM0T Sent: Monday, September 25, 2006 4:10 PM To: 'FlexRadio Mailing List' Subject: Re: [Flexradio] Poor sideband suppression Hi guys, this may or may not be a solution, and I know it has been beaten to death...but I too experienced this same thing over the weekend while I was helping a fellow with his SDR-1000. He brought his system over and we got it all set up. Going back and forth between our two systems and looking at each others signals, we too saw this opposite sideband or whatever it is come and go. We also saw an opposite CW single in that mode. After much messing around, we both pulled out, plugged in and twisted a number of times over our 3.5mm jacks on the back of the SDR-1000 for the delta 44 breakout box, and the opposite side signals went away. We did not mess with the TX rejection controls whatsoever... 73 & GL Mike - KM0T ___ 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
Re: [Flexradio] Poor sideband suppression
Jeff Anderson wrote: > Hi Mike, > > Thanks for the comment. > > Yes, we also jiggled & twisted the 3.5 mm plugs - the image rejection > settings are *very* sensitive to the connection between these jacks and > plugs, and we observed that if you even looked at them cross-eyed, the null > settings would change. > > Although I love my SDR1K (it's the only radio I use now, despite a shack > full of rigs), if there's one thing I'd change about its design, it's the > use of those jacks. Very cheap feel (plugs do not fit snugly). In fact, > unless I position the plug from my morse key in the key jack *just right*, > the radio will automatically go into Transmit when I select CW mode. Very > annoying. > > Thanks again, > > - Jeff, K6JCA > > > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Mike King - KM0T > Sent: Monday, September 25, 2006 1:10 PM > To: 'FlexRadio Mailing List' > Subject: Re: [Flexradio] Poor sideband suppression > > > Hi guys, this may or may not be a solution, and I know it has been beaten to > death...but I too experienced this same thing over the weekend while I was > helping a fellow with his SDR-1000. > > He brought his system over and we got it all set up. Going back and forth > between our two systems and looking at each others signals, we too saw this > opposite sideband or whatever it is come and go. We also saw an opposite CW > single in that mode. > > After much messing around, we both pulled out, plugged in and twisted a > number of times over our 3.5mm jacks on the back of the SDR-1000 for the > delta 44 breakout box, and the opposite side signals went away. > > We did not mess with the TX rejection controls whatsoever... > > 73 & GL > > Mike - KM0T > > > - Original Message - > From: "Jeff Anderson" <[EMAIL PROTECTED]> > To: "Gerald Capodieci" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]>; > > Sent: Monday, September 25, 2006 1:22 PM > Subject: Re: [Flexradio] Poor sideband suppression > > >> Hi Gerald, >> >> I don't think Jon's problem is one of TX Image >> Rejection. We nulled it down at least 70 dB using the >> procedure in the manual. But we're still seeing >> grunge on the opposite sideband. If I listen to that >> sideband on another receiver, it doesn't sound like a >> clear voice (as I would expect if, say, there was an >> I/Q imbalance that would produce sort of a DSB >> effect). Instead, it kind of sounds like SSB when you >> receive it in AM mode - you can tell it's a voice, >> sort of, but it sounds very very bad. >> >> My current hypothesis is that it might be PA IMD. >> Wish I'd looked at the spectrum pre-PA (at the QRP >> Output connector) yesterday when we had it on the >> bench, rather than looking only at the output post-PA. >> >> - Jeff, K6JCA. >> >> >> >> --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: >> >>> There is a procedure for Transmit Image Rejection >>> management on the bottom of page 90 of the manual. >>> It worked for me but I'm using a Delta 44. The >>> section was rewritten by Eric but not published yet. >>> Just use another trusted receiver, tune it to the >>> same frequency but the apposite side band and adjust >>> the SDR slider controls to surpress it. >>> >>> K6JEK <[EMAIL PROTECTED]> wrote: Here is an update >>> on the poor sideband suppression from my SDR-1000. >>> It is putting significant energy out on the wrong >>> sideband, visible in >>> the panadapter of a nearby fellow Flexer and audible >>> by not so nearby >>> hams listening on the opposite sideband. >>> >>> Yesterday I took the radio over to Jeff, K6JCA's, >>> impressive lab. >>> Together we used as many pieces of test equipment as >>> we could think of >>> -- HP spectrum analyzers, lab grade audio spectrum >>> analyzers, signal >>> generators, and most effectively of all Jeff's SDR >>> 1000 to see what was >>> happening with mine. We haven't completely solved >>> the problem. But >>> here are the weekend's revelations: >>> >>> 1) It not the opposite sideband. Listening on the >>> opposite sideband >>> sounds like SSB through an AM detector >>> 2) Wide band noise was coming out of the Firebox. >>> The little filter >>> on the li
Re: [Flexradio] Poor sideband suppression
Hi Mike, Thanks for the comment. Yes, we also jiggled & twisted the 3.5 mm plugs - the image rejection settings are *very* sensitive to the connection between these jacks and plugs, and we observed that if you even looked at them cross-eyed, the null settings would change. Although I love my SDR1K (it's the only radio I use now, despite a shack full of rigs), if there's one thing I'd change about its design, it's the use of those jacks. Very cheap feel (plugs do not fit snugly). In fact, unless I position the plug from my morse key in the key jack *just right*, the radio will automatically go into Transmit when I select CW mode. Very annoying. Thanks again, - Jeff, K6JCA -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Mike King - KM0T Sent: Monday, September 25, 2006 1:10 PM To: 'FlexRadio Mailing List' Subject: Re: [Flexradio] Poor sideband suppression Hi guys, this may or may not be a solution, and I know it has been beaten to death...but I too experienced this same thing over the weekend while I was helping a fellow with his SDR-1000. He brought his system over and we got it all set up. Going back and forth between our two systems and looking at each others signals, we too saw this opposite sideband or whatever it is come and go. We also saw an opposite CW single in that mode. After much messing around, we both pulled out, plugged in and twisted a number of times over our 3.5mm jacks on the back of the SDR-1000 for the delta 44 breakout box, and the opposite side signals went away. We did not mess with the TX rejection controls whatsoever... 73 & GL Mike - KM0T - Original Message - From: "Jeff Anderson" <[EMAIL PROTECTED]> To: "Gerald Capodieci" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]>; Sent: Monday, September 25, 2006 1:22 PM Subject: Re: [Flexradio] Poor sideband suppression > Hi Gerald, > > I don't think Jon's problem is one of TX Image > Rejection. We nulled it down at least 70 dB using the > procedure in the manual. But we're still seeing > grunge on the opposite sideband. If I listen to that > sideband on another receiver, it doesn't sound like a > clear voice (as I would expect if, say, there was an > I/Q imbalance that would produce sort of a DSB > effect). Instead, it kind of sounds like SSB when you > receive it in AM mode - you can tell it's a voice, > sort of, but it sounds very very bad. > > My current hypothesis is that it might be PA IMD. > Wish I'd looked at the spectrum pre-PA (at the QRP > Output connector) yesterday when we had it on the > bench, rather than looking only at the output post-PA. > > - Jeff, K6JCA. > > > > --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: > >> There is a procedure for Transmit Image Rejection >> management on the bottom of page 90 of the manual. >> It worked for me but I'm using a Delta 44. The >> section was rewritten by Eric but not published yet. >> Just use another trusted receiver, tune it to the >> same frequency but the apposite side band and adjust >> the SDR slider controls to surpress it. >> >> K6JEK <[EMAIL PROTECTED]> wrote: Here is an update >> on the poor sideband suppression from my SDR-1000. >> It is putting significant energy out on the wrong >> sideband, visible in >> the panadapter of a nearby fellow Flexer and audible >> by not so nearby >> hams listening on the opposite sideband. >> >> Yesterday I took the radio over to Jeff, K6JCA's, >> impressive lab. >> Together we used as many pieces of test equipment as >> we could think of >> -- HP spectrum analyzers, lab grade audio spectrum >> analyzers, signal >> generators, and most effectively of all Jeff's SDR >> 1000 to see what was >> happening with mine. We haven't completely solved >> the problem. But >> here are the weekend's revelations: >> >> 1) It not the opposite sideband. Listening on the >> opposite sideband >> sounds like SSB through an AM detector >> 2) Wide band noise was coming out of the Firebox. >> The little filter >> on the line-out line knocked it way back. >> 3) Audio coming out of the Firebox looked really >> good on the lab grade >> audio spectrum analyzer -- brick wall, no funny >> business -120 dBV >> noise floor (with the filter) >> 4) Careful adjustment of the TX Image dropped the >> opposite sideband >> signal by quite a bit, 10 - 20 dB >> 5) Jeff's radio has some of the funny opposite side >> signal too >> 6) Jeff has too much stuff >> 7) Two hams can spend an afternoon pushing
Re: [Flexradio] Poor sideband suppression
Hi guys, this may or may not be a solution, and I know it has been beaten to death...but I too experienced this same thing over the weekend while I was helping a fellow with his SDR-1000. He brought his system over and we got it all set up. Going back and forth between our two systems and looking at each others signals, we too saw this opposite sideband or whatever it is come and go. We also saw an opposite CW single in that mode. After much messing around, we both pulled out, plugged in and twisted a number of times over our 3.5mm jacks on the back of the SDR-1000 for the delta 44 breakout box, and the opposite side signals went away. We did not mess with the TX rejection controls whatsoever... 73 & GL Mike - KM0T - Original Message - From: "Jeff Anderson" <[EMAIL PROTECTED]> To: "Gerald Capodieci" <[EMAIL PROTECTED]>; "K6JEK" <[EMAIL PROTECTED]>; Sent: Monday, September 25, 2006 1:22 PM Subject: Re: [Flexradio] Poor sideband suppression > Hi Gerald, > > I don't think Jon's problem is one of TX Image > Rejection. We nulled it down at least 70 dB using the > procedure in the manual. But we're still seeing > grunge on the opposite sideband. If I listen to that > sideband on another receiver, it doesn't sound like a > clear voice (as I would expect if, say, there was an > I/Q imbalance that would produce sort of a DSB > effect). Instead, it kind of sounds like SSB when you > receive it in AM mode - you can tell it's a voice, > sort of, but it sounds very very bad. > > My current hypothesis is that it might be PA IMD. > Wish I'd looked at the spectrum pre-PA (at the QRP > Output connector) yesterday when we had it on the > bench, rather than looking only at the output post-PA. > > - Jeff, K6JCA. > > > > --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: > >> There is a procedure for Transmit Image Rejection >> management on the bottom of page 90 of the manual. >> It worked for me but I'm using a Delta 44. The >> section was rewritten by Eric but not published yet. >> Just use another trusted receiver, tune it to the >> same frequency but the apposite side band and adjust >> the SDR slider controls to surpress it. >> >> K6JEK <[EMAIL PROTECTED]> wrote: Here is an update >> on the poor sideband suppression from my SDR-1000. >> It is putting significant energy out on the wrong >> sideband, visible in >> the panadapter of a nearby fellow Flexer and audible >> by not so nearby >> hams listening on the opposite sideband. >> >> Yesterday I took the radio over to Jeff, K6JCA's, >> impressive lab. >> Together we used as many pieces of test equipment as >> we could think of >> -- HP spectrum analyzers, lab grade audio spectrum >> analyzers, signal >> generators, and most effectively of all Jeff's SDR >> 1000 to see what was >> happening with mine. We haven't completely solved >> the problem. But >> here are the weekend's revelations: >> >> 1) It not the opposite sideband. Listening on the >> opposite sideband >> sounds like SSB through an AM detector >> 2) Wide band noise was coming out of the Firebox. >> The little filter >> on the line-out line knocked it way back. >> 3) Audio coming out of the Firebox looked really >> good on the lab grade >> audio spectrum analyzer -- brick wall, no funny >> business -120 dBV >> noise floor (with the filter) >> 4) Careful adjustment of the TX Image dropped the >> opposite sideband >> signal by quite a bit, 10 - 20 dB >> 5) Jeff's radio has some of the funny opposite side >> signal too >> 6) Jeff has too much stuff >> 7) Two hams can spend an afternoon pushing RF >> between radios and not >> blow anything up >> >> > > ___ > 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 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
Re: [Flexradio] Poor sideband suppression
The lower values measured on the FireBox are likely due to the clipping protections that we added to the software to prevent damage to the radio due to the higher voltages of the FireBox. We have measured numerous FireBoxes and have concluded the following: 1. If a FireBox puts out any kind of audio at all, the Vmax will be 6.39Vrms. 2. See #1. ;) Another way to ensure that you have enough voltage is to check your PA Gain values. If they are within reason (38-51dB range), then you are probably ok. Eric Wachsmann FlexRadio Systems > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > radio.biz] On Behalf Of Jimmy Jones > Sent: Sunday, September 24, 2006 10:32 AM > To: flexradio@flex-radio.biz > Subject: Re: [Flexradio] Poor sideband suppression > > > One more thing. The output from the Firebox measures about 1.98V > during the audio TEST, nothing like the 6.93 hardwired into the set-up > form. > I can remember doing this measurement and getting nearly the same > results as you have. > I can't remember what the answer was but I think you are ok there. Maybe > the 6.93 was a peak to peak reading rather than a RMS reading. > 1.98 vrms wouldn't equal 6.93 pp so.. I just don't remember but I > know my measurement were the same as yours. Don't change your output > voltage to 1.98 in the audio/sound card tab. > Good Luck > > K6JEK wrote: > > Cables or operator error was my guess. I've checked and rechecked the > > cables. I've also swapped cables to no avail. I'll do all of this > > again today. > > > > Thanks, > > > > Jon > > > > On Sep 24, 2006, at 6:22 AM, Jimmy Jones wrote: > > > >> I've had this problem several times and the issue has always been cable > >> connection seating or cables in the wrong jack on the firebox. > >> Looking from front to back (on the Firebox) my cable connectors or > (left > >> to right) > >> On the top - Grey,Skip/NC,Grey and on the bottom - Red, Skip/NC, Red > >> I've never been a fan of the cable connectors used on the radio side of > >> this rig. They are very cheap and an invitation to trouble. I've known > >> people to hard wire these connections. > >> Good Luck > >> > >> K6JEK wrote: > >>> I'm getting poor opposite sideband suppression.Another Flex owner, > >>> Jeff, K6JCA, took a snapshot of my spectrum off the air and there is > a > >>> significant hump on the opposite sideband. Other listeners have heard > >>> the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX > >>> image alignment had very little effect. I performed the alignment > with > >>> a receiver, not a spectrum analyzer. > >>> > >>> Where do I start? > >>> > >>> Here's the set-up: Used SDR 1000, age TBD but was on the air before > I > >>> acquired it last week. Has the PA. > >>> New PreSonus Firebox, just got it from Flex (just before announcement > >>> of the FA-66 [EMAIL PROTECTED]) > >>> 48K sampling. Have not installed the beta firmware > >>> Cables from Flex, the HOSA cables > >>> Firewire to Compaq laptop, 1.3 GHz > >>> External (wall wart) power to Firebox > >>> Parallel cable, computer to radio > >>> 35A linear power supply to SDR1K > >>> 1.6.2 software > >>> > >>> One more thing. The output from the Firebox measures about 1.98V > >>> during the audio TEST, nothing like the 6.93 hardwired into the set-up > >>> form. > >>> > >>> Jon, K6JEK > >>> > >>> > >>> ___ > >>> 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 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 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 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
Re: [Flexradio] Poor sideband suppression
Hi Gerald, I don't think Jon's problem is one of TX Image Rejection. We nulled it down at least 70 dB using the procedure in the manual. But we're still seeing grunge on the opposite sideband. If I listen to that sideband on another receiver, it doesn't sound like a clear voice (as I would expect if, say, there was an I/Q imbalance that would produce sort of a DSB effect). Instead, it kind of sounds like SSB when you receive it in AM mode - you can tell it's a voice, sort of, but it sounds very very bad. My current hypothesis is that it might be PA IMD. Wish I'd looked at the spectrum pre-PA (at the QRP Output connector) yesterday when we had it on the bench, rather than looking only at the output post-PA. - Jeff, K6JCA. --- Gerald Capodieci <[EMAIL PROTECTED]> wrote: > There is a procedure for Transmit Image Rejection > management on the bottom of page 90 of the manual. > It worked for me but I'm using a Delta 44. The > section was rewritten by Eric but not published yet. > Just use another trusted receiver, tune it to the > same frequency but the apposite side band and adjust > the SDR slider controls to surpress it. > > K6JEK <[EMAIL PROTECTED]> wrote: Here is an update > on the poor sideband suppression from my SDR-1000. > It is putting significant energy out on the wrong > sideband, visible in > the panadapter of a nearby fellow Flexer and audible > by not so nearby > hams listening on the opposite sideband. > > Yesterday I took the radio over to Jeff, K6JCA's, > impressive lab. > Together we used as many pieces of test equipment as > we could think of > -- HP spectrum analyzers, lab grade audio spectrum > analyzers, signal > generators, and most effectively of all Jeff's SDR > 1000 to see what was > happening with mine. We haven't completely solved > the problem. But > here are the weekend's revelations: > > 1) It not the opposite sideband. Listening on the > opposite sideband > sounds like SSB through an AM detector > 2) Wide band noise was coming out of the Firebox. > The little filter > on the line-out line knocked it way back. > 3) Audio coming out of the Firebox looked really > good on the lab grade > audio spectrum analyzer -- brick wall, no funny > business -120 dBV > noise floor (with the filter) > 4) Careful adjustment of the TX Image dropped the > opposite sideband > signal by quite a bit, 10 - 20 dB > 5) Jeff's radio has some of the funny opposite side > signal too > 6) Jeff has too much stuff > 7) Two hams can spend an afternoon pushing RF > between radios and not > blow anything up > > ___ 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
Re: [Flexradio] Poor sideband suppression
There is a procedure for Transmit Image Rejection management on the bottom of page 90 of the manual. It worked for me but I'm using a Delta 44. The section was rewritten by Eric but not published yet. Just use another trusted receiver, tune it to the same frequency but the apposite side band and adjust the SDR slider controls to surpress it. K6JEK <[EMAIL PROTECTED]> wrote: Here is an update on the poor sideband suppression from my SDR-1000. It is putting significant energy out on the wrong sideband, visible in the panadapter of a nearby fellow Flexer and audible by not so nearby hams listening on the opposite sideband. Yesterday I took the radio over to Jeff, K6JCA's, impressive lab. Together we used as many pieces of test equipment as we could think of -- HP spectrum analyzers, lab grade audio spectrum analyzers, signal generators, and most effectively of all Jeff's SDR 1000 to see what was happening with mine. We haven't completely solved the problem. But here are the weekend's revelations: 1) It not the opposite sideband. Listening on the opposite sideband sounds like SSB through an AM detector 2) Wide band noise was coming out of the Firebox. The little filter on the line-out line knocked it way back. 3) Audio coming out of the Firebox looked really good on the lab grade audio spectrum analyzer -- brick wall, no funny business -120 dBV noise floor (with the filter) 4) Careful adjustment of the TX Image dropped the opposite sideband signal by quite a bit, 10 - 20 dB 5) Jeff's radio has some of the funny opposite side signal too 6) Jeff has too much stuff 7) Two hams can spend an afternoon pushing RF between radios and not blow anything up Jon Begin forwarded message: > From: K6JEK > Date: September 23, 2006 9:54:21 PM PDT > To: flexradio@flex-radio.biz > Subject: Poor sideband suppression > > I'm getting poor opposite sideband suppression. Another Flex owner, > Jeff, K6JCA, took a snapshot of my spectrum off the air and there is > a significant hump on the opposite sideband. Other listeners have > heard the opposite sideband. It's not DSB. It's maybe 30 dB down. > The TX image alignment had very little effect. I performed the > alignment with a receiver, not a spectrum analyzer. > > Where do I start? > > Here's the set-up: Used SDR 1000, age TBD but was on the air before > I acquired it last week. Has the PA. > New PreSonus Firebox, just got it from Flex > 48K sampling. Have not installed the beta firmware > Cables from Flex, the HOSA cables > Firewire to Compaq laptop, 1.3 GHz > External (wall wart) power to Firebox > Parallel cable, computer to radio > 35A linear power supply to SDR1K > 1.6.2 software > > One more thing. The output from the Firebox measures about 1.98V > during the audio TEST, nothing like the 6.93 hardwired into the set-up > form. > > Jon, K6JEK > -- next part -- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 2734 bytes Desc: not available Url : /pipermail/flexradio_flex-radio.biz/attachments/20060925/301b0e1e/attachment.bin ___ 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 -- next part -- An HTML attachment was scrubbed... URL: /pipermail/flexradio_flex-radio.biz/attachments/20060925/836e4049/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] Poor sideband suppression
Here is an update on the poor sideband suppression from my SDR-1000. It is putting significant energy out on the wrong sideband, visible in the panadapter of a nearby fellow Flexer and audible by not so nearby hams listening on the opposite sideband. Yesterday I took the radio over to Jeff, K6JCA's, impressive lab. Together we used as many pieces of test equipment as we could think of -- HP spectrum analyzers, lab grade audio spectrum analyzers, signal generators, and most effectively of all Jeff's SDR 1000 to see what was happening with mine. We haven't completely solved the problem. But here are the weekend's revelations: 1) It not the opposite sideband. Listening on the opposite sideband sounds like SSB through an AM detector 2) Wide band noise was coming out of the Firebox. The little filter on the line-out line knocked it way back. 3) Audio coming out of the Firebox looked really good on the lab grade audio spectrum analyzer -- brick wall, no funny business -120 dBV noise floor (with the filter) 4) Careful adjustment of the TX Image dropped the opposite sideband signal by quite a bit, 10 - 20 dB 5) Jeff's radio has some of the funny opposite side signal too 6) Jeff has too much stuff 7) Two hams can spend an afternoon pushing RF between radios and not blow anything up Jon Begin forwarded message: > From: K6JEK <[EMAIL PROTECTED]> > Date: September 23, 2006 9:54:21 PM PDT > To: flexradio@flex-radio.biz > Subject: Poor sideband suppression > > I'm getting poor opposite sideband suppression.Another Flex owner, > Jeff, K6JCA, took a snapshot of my spectrum off the air and there is > a significant hump on the opposite sideband. Other listeners have > heard the opposite sideband. It's not DSB. It's maybe 30 dB down. > The TX image alignment had very little effect. I performed the > alignment with a receiver, not a spectrum analyzer. > > Where do I start? > > Here's the set-up: Used SDR 1000, age TBD but was on the air before > I acquired it last week. Has the PA. > New PreSonus Firebox, just got it from Flex > 48K sampling. Have not installed the beta firmware > Cables from Flex, the HOSA cables > Firewire to Compaq laptop, 1.3 GHz > External (wall wart) power to Firebox > Parallel cable, computer to radio > 35A linear power supply to SDR1K > 1.6.2 software > > One more thing. The output from the Firebox measures about 1.98V > during the audio TEST, nothing like the 6.93 hardwired into the set-up > form. > > Jon, K6JEK > -- next part -- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 2734 bytes Desc: not available Url : /pipermail/flexradio_flex-radio.biz/attachments/20060925/301b0e1e/attachment.bin ___ 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
Re: [Flexradio] Poor sideband suppression
One more thing. The output from the Firebox measures about 1.98V during the audio TEST, nothing like the 6.93 hardwired into the set-up form. I can remember doing this measurement and getting nearly the same results as you have. I can't remember what the answer was but I think you are ok there. Maybe the 6.93 was a peak to peak reading rather than a RMS reading. 1.98 vrms wouldn't equal 6.93 pp so.. I just don't remember but I know my measurement were the same as yours. Don't change your output voltage to 1.98 in the audio/sound card tab. Good Luck K6JEK wrote: > Cables or operator error was my guess. I've checked and rechecked the > cables. I've also swapped cables to no avail. I'll do all of this > again today. > > Thanks, > > Jon > > On Sep 24, 2006, at 6:22 AM, Jimmy Jones wrote: > >> I've had this problem several times and the issue has always been cable >> connection seating or cables in the wrong jack on the firebox. >> Looking from front to back (on the Firebox) my cable connectors or (left >> to right) >> On the top - Grey,Skip/NC,Grey and on the bottom - Red, Skip/NC, Red >> I've never been a fan of the cable connectors used on the radio side of >> this rig. They are very cheap and an invitation to trouble. I've known >> people to hard wire these connections. >> Good Luck >> >> K6JEK wrote: >>> I'm getting poor opposite sideband suppression.Another Flex owner, >>> Jeff, K6JCA, took a snapshot of my spectrum off the air and there is a >>> significant hump on the opposite sideband. Other listeners have heard >>> the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX >>> image alignment had very little effect. I performed the alignment with >>> a receiver, not a spectrum analyzer. >>> >>> Where do I start? >>> >>> Here's the set-up: Used SDR 1000, age TBD but was on the air before I >>> acquired it last week. Has the PA. >>> New PreSonus Firebox, just got it from Flex (just before announcement >>> of the FA-66 [EMAIL PROTECTED]) >>> 48K sampling. Have not installed the beta firmware >>> Cables from Flex, the HOSA cables >>> Firewire to Compaq laptop, 1.3 GHz >>> External (wall wart) power to Firebox >>> Parallel cable, computer to radio >>> 35A linear power supply to SDR1K >>> 1.6.2 software >>> >>> One more thing. The output from the Firebox measures about 1.98V >>> during the audio TEST, nothing like the 6.93 hardwired into the set-up >>> form. >>> >>> Jon, K6JEK >>> >>> >>> ___ >>> 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 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 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
Re: [Flexradio] Poor sideband suppression
Cables or operator error was my guess. I've checked and rechecked the cables. I've also swapped cables to no avail. I'll do all of this again today. Thanks, Jon On Sep 24, 2006, at 6:22 AM, Jimmy Jones wrote: > I've had this problem several times and the issue has always been cable > connection seating or cables in the wrong jack on the firebox. > Looking from front to back (on the Firebox) my cable connectors or > (left > to right) > On the top - Grey,Skip/NC,Grey and on the bottom - Red, Skip/NC, Red > I've never been a fan of the cable connectors used on the radio side of > this rig. They are very cheap and an invitation to trouble. I've known > people to hard wire these connections. > Good Luck > > K6JEK wrote: >> I'm getting poor opposite sideband suppression.Another Flex owner, >> Jeff, K6JCA, took a snapshot of my spectrum off the air and there is >> a >> significant hump on the opposite sideband. Other listeners have heard >> the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX >> image alignment had very little effect. I performed the alignment >> with >> a receiver, not a spectrum analyzer. >> >> Where do I start? >> >> Here's the set-up: Used SDR 1000, age TBD but was on the air before >> I >> acquired it last week. Has the PA. >> New PreSonus Firebox, just got it from Flex (just before announcement >> of the FA-66 [EMAIL PROTECTED]) >> 48K sampling. Have not installed the beta firmware >> Cables from Flex, the HOSA cables >> Firewire to Compaq laptop, 1.3 GHz >> External (wall wart) power to Firebox >> Parallel cable, computer to radio >> 35A linear power supply to SDR1K >> 1.6.2 software >> >> One more thing. The output from the Firebox measures about 1.98V >> during the audio TEST, nothing like the 6.93 hardwired into the set-up >> form. >> >> Jon, K6JEK >> >> >> ___ >> 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 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 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
Re: [Flexradio] Poor sideband suppression
I tie wrapped my audio cable to the parallel cable for strain relief and it has worked fine so far. I wish the I/O used balanced audio rather than unbalanced. That is my gripe -Tim --- Tim Ellison Integrated Technical Services -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of A.R.S. - W5AMI Sent: Sunday, September 24, 2006 9:46 AM To: Jimmy Jones Cc: flexradio@flex-radio.biz Subject: Re: [Flexradio] Poor sideband suppression Soon as my warranty runs out, I plan to hard wire mine. On 9/24/06, Jimmy Jones <[EMAIL PROTECTED]> wrote: > I've had this problem several times and the issue has always been cable > connection seating or cables in the wrong jack on the firebox. > Looking from front to back (on the Firebox) my cable connectors or (left > to right) > On the top - Grey,Skip/NC,Grey and on the bottom - Red, Skip/NC, Red > I've never been a fan of the cable connectors used on the radio side of > this rig. They are very cheap and an invitation to trouble. I've known > people to hard wire these connections. > Good Luck > > K6JEK wrote: > > I'm getting poor opposite sideband suppression.Another Flex owner, > > Jeff, K6JCA, took a snapshot of my spectrum off the air and there is a > > significant hump on the opposite sideband. Other listeners have heard > > the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX > > image alignment had very little effect. I performed the alignment with > > a receiver, not a spectrum analyzer. > > > > Where do I start? > > > > Here's the set-up: Used SDR 1000, age TBD but was on the air before I > > acquired it last week. Has the PA. > > New PreSonus Firebox, just got it from Flex (just before announcement > > of the FA-66 [EMAIL PROTECTED]) > > 48K sampling. Have not installed the beta firmware > > Cables from Flex, the HOSA cables > > Firewire to Compaq laptop, 1.3 GHz > > External (wall wart) power to Firebox > > Parallel cable, computer to radio > > 35A linear power supply to SDR1K > > 1.6.2 software > > > > One more thing. The output from the Firebox measures about 1.98V > > during the audio TEST, nothing like the 6.93 hardwired into the set-up > > form. > > > > Jon, K6JEK > > > > > > ___ > > 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 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 > -- "There is nothing more uncommon than common sense." -- Frank Lloyd Wright ___ 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 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
Re: [Flexradio] Poor sideband suppression
Soon as my warranty runs out, I plan to hard wire mine. On 9/24/06, Jimmy Jones <[EMAIL PROTECTED]> wrote: > I've had this problem several times and the issue has always been cable > connection seating or cables in the wrong jack on the firebox. > Looking from front to back (on the Firebox) my cable connectors or (left > to right) > On the top - Grey,Skip/NC,Grey and on the bottom - Red, Skip/NC, Red > I've never been a fan of the cable connectors used on the radio side of > this rig. They are very cheap and an invitation to trouble. I've known > people to hard wire these connections. > Good Luck > > K6JEK wrote: > > I'm getting poor opposite sideband suppression.Another Flex owner, > > Jeff, K6JCA, took a snapshot of my spectrum off the air and there is a > > significant hump on the opposite sideband. Other listeners have heard > > the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX > > image alignment had very little effect. I performed the alignment with > > a receiver, not a spectrum analyzer. > > > > Where do I start? > > > > Here's the set-up: Used SDR 1000, age TBD but was on the air before I > > acquired it last week. Has the PA. > > New PreSonus Firebox, just got it from Flex (just before announcement > > of the FA-66 [EMAIL PROTECTED]) > > 48K sampling. Have not installed the beta firmware > > Cables from Flex, the HOSA cables > > Firewire to Compaq laptop, 1.3 GHz > > External (wall wart) power to Firebox > > Parallel cable, computer to radio > > 35A linear power supply to SDR1K > > 1.6.2 software > > > > One more thing. The output from the Firebox measures about 1.98V > > during the audio TEST, nothing like the 6.93 hardwired into the set-up > > form. > > > > Jon, K6JEK > > > > > > ___ > > 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 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 > -- "There is nothing more uncommon than common sense." -- Frank Lloyd Wright ___ 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
Re: [Flexradio] Poor sideband suppression
I've had this problem several times and the issue has always been cable connection seating or cables in the wrong jack on the firebox. Looking from front to back (on the Firebox) my cable connectors or (left to right) On the top - Grey,Skip/NC,Grey and on the bottom - Red, Skip/NC, Red I've never been a fan of the cable connectors used on the radio side of this rig. They are very cheap and an invitation to trouble. I've known people to hard wire these connections. Good Luck K6JEK wrote: > I'm getting poor opposite sideband suppression.Another Flex owner, > Jeff, K6JCA, took a snapshot of my spectrum off the air and there is a > significant hump on the opposite sideband. Other listeners have heard > the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX > image alignment had very little effect. I performed the alignment with > a receiver, not a spectrum analyzer. > > Where do I start? > > Here's the set-up: Used SDR 1000, age TBD but was on the air before I > acquired it last week. Has the PA. > New PreSonus Firebox, just got it from Flex (just before announcement > of the FA-66 [EMAIL PROTECTED]) > 48K sampling. Have not installed the beta firmware > Cables from Flex, the HOSA cables > Firewire to Compaq laptop, 1.3 GHz > External (wall wart) power to Firebox > Parallel cable, computer to radio > 35A linear power supply to SDR1K > 1.6.2 software > > One more thing. The output from the Firebox measures about 1.98V > during the audio TEST, nothing like the 6.93 hardwired into the set-up > form. > > Jon, K6JEK > > > ___ > 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 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] Poor sideband suppression
I'm getting poor opposite sideband suppression.Another Flex owner, Jeff, K6JCA, took a snapshot of my spectrum off the air and there is a significant hump on the opposite sideband. Other listeners have heard the opposite sideband. It's not DSB. It's maybe 30 dB down. The TX image alignment had very little effect. I performed the alignment with a receiver, not a spectrum analyzer. Where do I start? Here's the set-up: Used SDR 1000, age TBD but was on the air before I acquired it last week. Has the PA. New PreSonus Firebox, just got it from Flex (just before announcement of the FA-66 [EMAIL PROTECTED]) 48K sampling. Have not installed the beta firmware Cables from Flex, the HOSA cables Firewire to Compaq laptop, 1.3 GHz External (wall wart) power to Firebox Parallel cable, computer to radio 35A linear power supply to SDR1K 1.6.2 software One more thing. The output from the Firebox measures about 1.98V during the audio TEST, nothing like the 6.93 hardwired into the set-up form. Jon, K6JEK ___ 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
