I have a SSB downconverter for S band. Does anyone know if there are any downconverters for 5830-5850 ghz for downlink via Eagle C band? Looks like i would want a 70cm IF in that?
Les W4SCO
Les,
I have been following your questions with Domenico's answer to you. Here are my thoughts and "assumptions" (as I do not think it has been established by Eagle design team at this early time):
1. For mode S/C I suspect they will come out with a single dish design (dual S/C feed). Dual-band mw feeds have been previously designed for higher mw bands, so this is probably a good assumption. The single dish would fit the "apartment size" station objective of Eagle. It also makes sense. 2. Eagle Team have already stated that the C-band downlink sub-band at 5 GHz is above the freq that are allocated for wireless data devices (hopefully will not suffer interference from them). The old C-C Rider concept had the uplink side down near the wireless band. Your 5.8 Ghz wireless should coexist with Eagle mode-C from what the Eagle Team has already stated. 3. Dom makes a good point about choice of IF for the C-band downconvertor. 70cm makes sense as the IF. There is no equipment that I know of existing at this time. Eagle Team has already stated they will be providing a mode-S/C ground station design (or kit, or?). There is no "ready to go" surplus stuff like the 2.6 GHz MMDS that made mode-S fairly easy for AO-40. 4. You are asking for information way premature. Eagle is not at the point of having the design "in concrete" so it would be wise to wait till things are further along to begin building your ground station. Mode- U/V is pretty easy to guess at. If mode-S (downlink) were added I would assume (for now) something close to AO-40 (but maybe S2 level signals or lower?).
Its a guessing game right now. Until Eagle Team has firmly set the satellite parameters the path-link cannot be calculated with any certainty so your ground station requirements are similarly undefined.
I would suggest that getting our home stations ready for P3E would be the priority. Then one can hope that Eagle will not be too far different in requirements on the common modes.
As the above is just my best guess (based on lots of assumptions, not hard facts). Caveat Emptor :-)
73's Ed - KL7UW
At 09:47 AM 9/15/2006 -0400, sco@sco-inc.com wrote:
I have a SSB downconverter for S band. Does anyone know if there are any downconverters for 5830-5850 ghz for downlink via Eagle C band? Looks like i would want a 70cm IF in that?
Les W4SCO
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
73's, Ed - KL7UW ========================================= http://www.qsl.net/al7eb - BP40iq 144-EME: FT-847, mgf-1801/1402, 4xM2-xpol-20, 170w 432-EME: FT-847, mgf-1402, 1x21-ele (18.6 dBi), 60w =========================================
I read:
There is no "ready to go" surplus stuff like the 2.6 GHz MMDS that made mode-S fairly easy for AO- 40.
Just to add this note how the rest of the world, "the third world" will proceed in case of an emergency or natural disaster and so on. We all know even with the last year hurricane season in louisianna S/C satellite will be of very little help even AO-51 does not pass any emergency traffic? even if they put it in an "emergency mode" it looks good in the media only!
Still don't understand the mindings behind "THE AMSAT-NA VISION" regarding the emergency affair. Could be some are still stuck with Buck Rogers cartoons...
P.S. As the power lines are the first to go down in a natural disaster is it not logiic to believe that all the S band interference will be down as well? Considerring the AMSAT-NA vissonnaires why they not put this in their calculus? thay have already all the ready to go installations for AO-40 up and running! Is it not what we are looking for in case of an emergency "easy ready to use stuff"?
The more i hear and read on theses visions the more i believe it makes no sense at all. Could be we can ask Buffy some help... Speaking of visions at least she will offer us a young refreshing one ...;)
"-" The medium is the message...The content is the audience...;)
Luc Leblanc VE2DWE WAC basic,CW,Phone,Satellite Skype VE2DWE www.qsl.net/ve2dwe
While power lines may be out locally they won't be out in the entire Eagle footprint!
An emergency would require long distance communications and the "out of emergency areas" where help could be available would have power and S-band noise making it harder to hear any weak signals.
Ed ----- Original Message ----- From: Luc Leblanc VE2DWEmailto:lucleblanc6@videotron.ca To: AMSAT-BB@amsat.orgmailto:AMSAT-BB@amsat.org Sent: Friday, September 15, 2006 11:27 AM Subject: [amsat-bb] Re: C Band Downconverter
I read:
There is no "ready to go" surplus stuff like the 2.6 GHz MMDS that made mode-S fairly easy for AO- 40.
Just to add this note how the rest of the world, "the third world" will proceed in case of an emergency or natural disaster and so on. We all know even with the last year hurricane season in louisianna S/C satellite will be of very little help even AO-51 does not pass any emergency traffic? even if they put it in an "emergency mode" it looks good in the media only!
Still don't understand the mindings behind "THE AMSAT-NA VISION" regarding the emergency affair. Could be some are still stuck with Buck Rogers cartoons...
P.S. As the power lines are the first to go down in a natural disaster is it not logiic to believe that all the S band interference will be down as well? Considerring the AMSAT-NA vissonnaires why they not put this in their calculus? thay have already all the ready to go installations for AO-40 up and running! Is it not what we are looking for in case of an emergency "easy ready to use stuff"?
The more i hear and read on theses visions the more i believe it makes no sense at all. Could be we can ask Buffy some help... Speaking of visions at least she will offer us a young refreshing one ...;)
"-" The medium is the message...The content is the audience...;)
Luc Leblanc VE2DWE WAC basic,CW,Phone,Satellite Skype VE2DWE www.qsl.net/ve2dwehttp://www.qsl.net/ve2dwe _______________________________________________ Sent via AMSAT-BB@amsat.orgmailto:AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bbhttp://amsat.org/mailman/listinfo/amsat-bb
----- Original Message ----- From: "Luc Leblanc VE2DWE" lucleblanc6@videotron.ca To: AMSAT-BB@amsat.org Sent: Friday, September 15, 2006 5:27 PM Subject: [amsat-bb] Re: C Band Downconverter
P.S. As the power lines are the first to go down in a natural disaster is it not logiic to believe that all the S band interference will be down as well? Considerring the AMSAT-NA vissonnaires why they not put this in their calculus? thay have already all the ready to go installations for AO-40 up and running! Is it not what we are looking for in case of an emergency "easy ready to use stuff"?
Hi Luc
Good point ! and for antennas in the emergency you can use those depicted in QST september 2006 page-42
73" de
i8CVS Domenico
The more i hear and read on theses visions the more i believe it makes no sense at all. Could be we can ask Buffy some help... Speaking of visions at least she will offer us a young refreshing one ...;)
"-" The medium is the message...The content is the audience...;)
Luc Leblanc VE2DWE WAC basic,CW,Phone,Satellite Skype VE2DWE www.qsl.net/ve2dwe
I think someone mentioned the idea of using the S-band RX converter as an intermediate IF. I was playing around with the idea of using an MMDS converter with a C-band mixer. If you can move the LO in the MMDS converter up to 2700 MHz, that gives you a 3130 MHz IF for 5830. If you then use the MMDS converter's guts for the second conversion (you may have to tweak a filter or two to pass the 3130), you will get 430 MHz IF received. In other words, you can use the MMDS converter's LO for both first *and* second IF.
Granted getting those things to oscillate at 2.7 GHz is a ways from where they were designed. Still, it might be a fun project....and you get to do a little algebra. It may be easier just to get an old PLL brick, preamp, filter and mixer. RX or TX converters aren't too hard to build since you can generally avoid complexities for TR switching.
-Andy K0SM/2
participants (6)
-
Andrew T. Flowers, K0SM -
Ed Long -
Edward R. Cole -
i8cvs -
Luc Leblanc VE2DWE -
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