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#1
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"gareth" wrote in message
... These questions are raised by the possibility of resurrecting a project with a former colleague from uni 43 years ago, now that we are both retired, although it will be dismissed cynically as vapourware by some nasty individual, to produce a speccy covering up to 10GHz together with tracking genny but based aroind COTS components that feature more and more in domestic white goods. There are two aspects of vector analysis under consideratiom; the first, as for antennae measurement is to assess the amplitude and phase of reflected power from various circuits, which is where the interest in the VNWA arises, but the second is the analysis of complex modulation, particularly where there are constellations. |
#2
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In rec.radio.amateur.antenna gareth wrote:
"gareth" wrote in message ... These questions are raised by the possibility of resurrecting a project with a former colleague from uni 43 years ago, now that we are both retired, although it will be dismissed cynically as vapourware by some nasty individual, to produce a speccy covering up to 10GHz together with tracking genny but based aroind COTS components that feature more and more in domestic white goods. There are two aspects of vector analysis under consideratiom; the first, as for antennae measurement is to assess the amplitude and phase of reflected power from various circuits, which is where the interest in the VNWA arises, but the second is the analysis of complex modulation, particularly where there are constellations. I can not think of any antenna that modulates signals. -- Jim Pennino |
#3
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On Sun, 27 Dec 2015 18:46:42 -0000, wrote:
I can not think of any antenna that modulates signals. I talk to my antennas all the time. I only worry when they talk back. DAM (Direct Antenna Modulation): http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5464640&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D5464640 http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1339221&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D1339221 https://www.google.com/search?q=direct+antenna+modulation -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#4
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In rec.radio.amateur.antenna Jeff Liebermann wrote:
On Sun, 27 Dec 2015 18:46:42 -0000, wrote: I can not think of any antenna that modulates signals. I talk to my antennas all the time. I only worry when they talk back. DAM (Direct Antenna Modulation): http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5464640&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D5464640 http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1339221&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D1339221 https://www.google.com/search?q=direct+antenna+modulation Got plans for one for 40 meters? -- Jim Pennino |
#6
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On Sun, 27 Dec 2015 12:15:51 -0000, "gareth"
wrote: There are two aspects of vector analysis under consideratiom; the first, as for antennae measurement is to assess the amplitude and phase of reflected power from various circuits, which is where the interest in the VNWA arises, but the second is the analysis of complex modulation, particularly where there are constellations. Antenna analyzers do NOT demodulate signals or present constellation plots. They only measure antenna and transmission line impedances. For a constellation plot, you'll need a service monitor with the decoding software for whatever modulation type you want to view. Compared to an MFJ-259/269, that will increase your test equipment budget about 500 times. Or you can search for an RTL-SDR implimentation that displays a constellation plot. Maybe this one: http://yo3iiu.ro/blog/?p=1393 Lots of jitter, but cheap. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#7
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professionla bounce up with snide comments ......
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#8
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On Mon, 28 Dec 2015 07:57:37 -0000, "Jim GM4DHJ ..."
wrote: professionla bounce up with snide comments ...... Nothing of value has ever been written on one line. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#9
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Jeff Liebermann wrote:
On Mon, 28 Dec 2015 07:57:37 -0000, "Jim GM4DHJ ..." wrote: professionla bounce up with snide comments ...... Nothing of value has ever been written on one line. A bird in the hand is always greener on the other side. -- STC // M0TEY // twitter.com/ukradioamateur |
#10
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![]() "Jeff Liebermann" wrote in message ... On Mon, 28 Dec 2015 07:57:37 -0000, "Jim GM4DHJ ..." wrote: professionla bounce up with snide comments ...... Nothing of value has ever been written on one line. Jeff Liebermann very true... I spelt that the wrong way.... |
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