|
Computer / radio isolation for digital (or even voice?)
|
Computer / radio isolation for digital (or even voice?)
In message , Gareth's Downstairs Computer
writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). -- Ian |
Computer / radio isolation for digital (or even voice?)
On 09/02/2018 21:53, Ian Jackson wrote:
In message , Gareth's Downstairs Computer writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). It is, I ordered a pack this morning. At that price cheap enough for stock. I have some on surplus/scrap boards which came my way (I think part of the odd digital PMR radio system 'National One' when the local unit was scrapped) but, unsoldering them is a pain. At under £2.50 for 10, inc postage, it isn't worth it. -- Suspect someone is claiming a benefit under false pretences? Incapacity Benefit or Personal Independence Payment when they don't need it? They are depriving those in real need! https://www.gov.uk/report-benefit-fraud |
Computer / radio isolation for digital (or even voice?)
On 09/02/2018 21:53, Ian Jackson wrote:
In message , Gareth's Downstairs Computer writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). BTW, did you know you are also supposedly a moderator for ulm, sorry a tame moderator for ulm? -- Suspect someone is claiming a benefit under false pretences? Incapacity Benefit or Personal Independence Payment when they don't need it? They are depriving those in real need! https://www.gov.uk/report-benefit-fraud |
Computer / radio isolation for digital (or even voice?)
In message , Brian Reay writes
On 09/02/2018 21:53, Ian Jackson wrote: In message , Gareth's Downstairs Computer writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). BTW, did you know you are also supposedly a moderator for ulm, sorry a tame moderator for ulm? No! -- Ian |
Computer / radio isolation for digital (or even voice?)
On Fri, 9 Feb 2018 22:06:41 +0000, Brian Reay wrote:
On 09/02/2018 21:53, Ian Jackson wrote: In message , Gareth's Downstairs Computer writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). BTW, did you know you are also supposedly a moderator for ulm, sorry a tame moderator for ulm? Oh dear, searching for support are we? |
Computer / radio isolation for digital (or even voice?)
On Fri, 9 Feb 2018 21:53:50 +0000, Ian Jackson
wrote: In message , Gareth's Downstairs Computer m writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). I intend to try transmitting DVB-T on 438 Mhz but from what I have read doing such will result in extra bandwidth due to sidebands. |
Computer / radio isolation for digital (or even voice?)
In message , Lucifer
Morningstar writes On Fri, 9 Feb 2018 21:53:50 +0000, Ian Jackson wrote: In message , Gareth's Downstairs Computer writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). I intend to try transmitting DVB-T on 438 Mhz but from what I have read doing such will result in extra bandwidth due to sidebands. I'm not sure how wide a single 'programme' DVB-T MUX is - but I suspect it should fit inside the top end of the band. However, be aware of the presence of certain non-standard repeater shifts (some up to 7.6MHz, I think). Aren't some people trying live digital in the 1MHz extension of 2m? You need to check with the BATC. http://www.batc.org.uk -- Ian |
Computer / radio isolation for digital (or even voice?)
On Sat, 10 Feb 2018 11:21:17 +0000, Ian Jackson
wrote: In message , Lucifer Morningstar writes On Fri, 9 Feb 2018 21:53:50 +0000, Ian Jackson wrote: In message , Gareth's Downstairs Computer m writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). I intend to try transmitting DVB-T on 438 Mhz but from what I have read doing such will result in extra bandwidth due to sidebands. I'm not sure how wide a single 'programme' DVB-T MUX is - but I suspect it should fit inside the top end of the band. However, be aware of the presence of certain non-standard repeater shifts (some up to 7.6MHz, I think). Aren't some people trying live digital in the 1MHz extension of 2m? You need to check with the BATC. http://www.batc.org.uk I have DVB-T encoder modulator that can do 4 programs anywhere from 30 to 960 Mhz. |
Computer / radio isolation for digital (or even voice?)
In message , Lucifer
Morningstar writes On Sat, 10 Feb 2018 11:21:17 +0000, Ian Jackson wrote: In message , Lucifer Morningstar writes On Fri, 9 Feb 2018 21:53:50 +0000, Ian Jackson wrote: In message , Gareth's Downstairs Computer om writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). I intend to try transmitting DVB-T on 438 Mhz but from what I have read doing such will result in extra bandwidth due to sidebands. I'm not sure how wide a single 'programme' DVB-T MUX is - but I suspect it should fit inside the top end of the band. However, be aware of the presence of certain non-standard repeater shifts (some up to 7.6MHz, I think). Aren't some people trying live digital in the 1MHz extension of 2m? You need to check with the BATC. http://www.batc.org.uk I have DVB-T encoder modulator that can do 4 programs anywhere from 30 to 960 Mhz. But how wide is it when it carries only one 'programme'? -- Ian |
Computer / radio isolation for digital (or even voice?)
Ian Jackson wrote:
In message , Lucifer Morningstar writes On Sat, 10 Feb 2018 11:21:17 +0000, Ian Jackson wrote: In message , Lucifer Morningstar writes On Fri, 9 Feb 2018 21:53:50 +0000, Ian Jackson wrote: In message , Gareth's Downstairs Computer headstone255.but.not.these.five.words@yahoo. com writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). I intend to try transmitting DVB-T on 438 Mhz but from what I have read doing such will result in extra bandwidth due to sidebands. I'm not sure how wide a single 'programme' DVB-T MUX is - but I suspect it should fit inside the top end of the band. However, be aware of the presence of certain non-standard repeater shifts (some up to 7.6MHz, I think). Aren't some people trying live digital in the 1MHz extension of 2m? You need to check with the BATC. http://www.batc.org.uk I have DVB-T encoder modulator that can do 4 programs anywhere from 30 to 960 Mhz. But how wide is it when it carries only one 'programme'? In theory it could omit carriers and transmit a narrower signal at lower bitrate, but in practice "standard DVB-T transmitters" cannot do this. I heard some amateurs produced modulators and alternative firmware that can do e.g. a 2 MHz wide DVB-T signal. |
Computer / radio isolation for digital (or even voice?)
"Ian Jackson" wrote in message
... In message , Lucifer Morningstar writes On Sat, 10 Feb 2018 11:21:17 +0000, Ian Jackson wrote: In message , Lucifer Morningstar writes On Fri, 9 Feb 2018 21:53:50 +0000, Ian Jackson wrote: In message , Gareth's Downstairs Computer headstone255.but.not.these.five.words@yahoo. com writes https://www.ebay.co.uk/itm/10x-Audio...Ohm-Europe-1-1 -EI14-Isolation-Transformer-Newest/172824007609?epid=2184088304&hash=ite m283d1d13b9:g:d2EAAOSwDmtZlWH2 That's a fantastic price. I'm using a 600/600 ohm audio transformer to isolate an earth-loop problem between the rig and the PC (extracting the audio to feed into the sound card so I can get SSTV and DRM pictures using MMSTV and Easypal). I intend to try transmitting DVB-T on 438 Mhz but from what I have read doing such will result in extra bandwidth due to sidebands. I'm not sure how wide a single 'programme' DVB-T MUX is - but I suspect it should fit inside the top end of the band. However, be aware of the presence of certain non-standard repeater shifts (some up to 7.6MHz, I think). Aren't some people trying live digital in the 1MHz extension of 2m? You need to check with the BATC. http://www.batc.org.uk I have DVB-T encoder modulator that can do 4 programs anywhere from 30 to 960 Mhz. But how wide is it when it carries only one 'programme'? Its width will always be the same, even when switched off. -- ;-) .. 73 de Frank Turner-Smith G3VKI - mine's a pint. .. http://turner-smith.uk |
Computer / radio isolation for digital (or even voice?)
In message , FranK Turner-Smith G3VKI
writes "Ian Jackson" wrote in message ... In message , Lucifer Morningstar writes I have DVB-T encoder modulator that can do 4 programs anywhere from 30 to 960 Mhz. But how wide is it when it carries only one 'programme'? Its width will always be the same, even when switched off. You mean..... like....... 19.5"? That'll fit in the 70cm with room to spare. -- Ian |
| All times are GMT +1. The time now is 03:47 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
RadioBanter.com