I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
Phil,
That is an interesting question. I have fooled with a simple 1/4 wave vertical, and observe very bad fading with a period of 10's of seconds (5 to 10 times longer than individual frames). It seems to my ear that signals need to be pretty strong in order to decode on AMSAT-UK's "dashboard" software.
-Joe KM1P
On 4/19/2014 5:33 AM, Phil Karn wrote:
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
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Overall I'll take funcubes telemetry over any AFSK bird.... It's extremely simple to receive and in my opinion it's much better than I've ever had luck on an AFSK bird.
On Saturday, April 19, 2014, Joe Fitzgerald [email protected] wrote:
Phil,
That is an interesting question. I have fooled with a simple 1/4 wave vertical, and observe very bad fading with a period of 10's of seconds (5 to 10 times longer than individual frames). It seems to my ear that signals need to be pretty strong in order to decode on AMSAT-UK's "dashboard" software.
-Joe KM1P
On 4/19/2014 5:33 AM, Phil Karn wrote:
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
Sent via [email protected]. 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
Sent via [email protected]. 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
I guess I was lucky I dont recall any fading with AO 40.
On 4/19/2014 4:33 AM, Phil Karn wrote:
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
Hi John, W0JAB
On AO40 you should remember mostly the fading due of spin modulation...... WOW..........WOW.............WOW...... because of rotation of the satellite over the Z axis ! !
73" de
i8CVS Domenico
----- Original Message ----- From: "John Becker" [email protected] To: [email protected] Sent: Sunday, April 20, 2014 12:42 AM Subject: [amsat-bb] Re: FUNcube telemetry performance?
I guess I was lucky I dont recall any fading with AO 40.
On 4/19/2014 4:33 AM, Phil Karn wrote:
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
Sent via [email protected]. 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
Yes, Domenico, but AO-40 gets better in my memory with each passing year. Perhaps that is why it _seems_ like some of the frames I hear from Funcube should decode when they don't.
-Joe
Hi John, W0JAB
On AO40 you should remember mostly the fading due of spin modulation...... WOW..........WOW.............WOW...... because of rotation of the satellite over the Z axis ! !
73" de
i8CVS Domenico
----- Original Message ----- From: "John Becker" [email protected] To: [email protected] Sent: Sunday, April 20, 2014 12:42 AM Subject: [amsat-bb] Re: FUNcube telemetry performance?
I guess I was lucky I dont recall any fading with AO 40.
On 4/19/2014 4:33 AM, Phil Karn wrote:
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
Sent via [email protected]. 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
Sent via [email protected]. 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
Hi Phil et All I can copy and decode the beacon at 30 mw EIRP using the M^2 yagi at very low SNR ~ 10 db SNR I do not see much fading
nick
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Phil Karn Sent: Saturday, April 19, 2014 4:34 AM To: [email protected] Subject: [amsat-bb] FUNcube telemetry performance?
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
_______________________________________________ Sent via [email protected]. 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
When FUNcube was first launched, I went out to listen to it on the first pass that I was home for (orbit #11 I believe). Since I live in an apartment building, I have to go outside to hear most satellite passes. I recorded the audio on my normal MP3 voice recorder and to my great surprise, when I fed the audio into my computer, I was able to decode several packets. I was not expecting it to be robust enough to survive 192 kbps MP3 compression and encoding.
73,
Paul, N8HM
On Mon, Apr 21, 2014 at 5:07 AM, Nick Pugh K5QXJ [email protected]wrote:
Hi Phil et All I can copy and decode the beacon at 30 mw EIRP using the M^2 yagi at very low SNR ~ 10 db SNR I do not see much fading
nick
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Phil Karn Sent: Saturday, April 19, 2014 4:34 AM To: [email protected] Subject: [amsat-bb] FUNcube telemetry performance?
I haven't done anything with AO-73, but I understand it's transmitting the FEC format I originally designed for AO-40.
How well is it working? What fraction of the frames are successfully decoded? How bad is the fading? I designed my format specifically for the spin fading on AO-40, and if the fading due to the tumbling of a cubesat is too slow my format won't be able to fix it.
Phil
Sent via [email protected]. 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
Sent via [email protected]. 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
On 04/22/2014 03:40 PM, Paul Stoetzer wrote:
When FUNcube was first launched, I went out to listen to it on the first pass that I was home for (orbit #11 I believe). Since I live in an apartment building, I have to go outside to hear most satellite passes. I recorded the audio on my normal MP3 voice recorder and to my great surprise, when I fed the audio into my computer, I was able to decode several packets. I was not expecting it to be robust enough to survive 192 kbps MP3 compression and encoding.
I'm surprised too! But I had never tested it.
Phil
participants (7)
-
Bryce Salmi -
i8cvs -
Joe Fitzgerald -
John Becker -
Nick Pugh K5QXJ -
Paul Stoetzer -
Phil Karn