anyone using a vertical antenna for the FM satellites? Which one & how does it work? 73 Bob W7LRD
Should be about the same as horizontal, or 45 degrees for that matter. Satellites, other than the ISS, all spin. Best bet is circular; failing that, they're all about the same.
Greg KO6TH
On November 26, 2020 2:28:55 PM PST, 73 Bob W7LRD via AMSAT-BB amsat-bb@amsat.org wrote:
anyone using a vertical antenna for the FM satellites? Which one & how does it work? 73 Bob W7LRD _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
I have a DIamond tri-band vertical connected to my IC-9700. I'm not sure why (might be trees or the house blocking the signal), but it's not really usable for satellite work.
On Thu, Nov 26, 2020 at 5:30 PM 73 Bob W7LRD via AMSAT-BB < amsat-bb@amsat.org> wrote:
anyone using a vertical antenna for the FM satellites? Which one & how does it work? 73 Bob W7LRD _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
I wrote a blogpost about vertical antennas (in german - maybe google translate can help you). But there are some radiation patterns in the article from different antennas. They can help you for understanding in which situation it works also with satellite. https://www.michi-dani.ch/2020/10/21/es-geht-auch-mit-rundstrahlenden-antenn...
73s Michael hb9wdf
----Ursprüngliche Nachricht---- Von : amsat-bb@amsat.org Datum : 26/11/2020 - 23:28 (MN) An : amsat-bb@amsat.org Betreff : [amsat-bb] vertical antenna
anyone using a vertical antenna for the FM satellites? Which one & how does it work? 73 Bob W7LRD _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Bob W7LRD,
Keep in mind that SATs tumble during their flight in space todifferent attitudes. When the SAT antenna is vertical with respectto your vertical antenna, the signal level will be at its best. But, whenit is horizontal with respect to your vertical, it will be at its worst by20 dB or more. That will be a very deep fade. So, as the SAT tumbles, you would experience fading from 0 to 20 dBeven if the SAT was completely facing you in the same plane. As it turns away from you, it could even be wore. That's why gain antennasare helpful to make up for some of those drawbacks. In the link below is a chart showing the polarization losses when theantennas are in the same plane. I found it interesting that the loss isonly 3 dB when the angle is off by 45. It really gets severe in the next45 degrees (20 dB!!). GL/73, Bob K8BL http://www.tscm.com/polariza.pdf
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I wrote a blogpost about vertical antennas (in german - maybe google translate can help you). But there are some radiation patterns in the article from different antennas. They can help you for understanding in which situation it works also with satellite. https://www.michi-dani.ch/2020/10/21/es-geht-auch-mit-rundstrahlenden-antenn...
73s Michael hb9wdf
----Ursprüngliche Nachricht---- Von : amsat-bb@amsat.org Datum : 26/11/2020 - 23:28 (MN) An : amsat-bb@amsat.org Betreff : [amsat-bb] vertical antenna
anyone using a vertical antenna for the FM satellites? Which one & how does it work? 73 Bob W7LRD _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
participants (5)
-
73 Bob W7LRD -
Bob Liddy (K8BL) -
Greg D -
hb9wdf＠bluewin.ch -
Rich Gopstein