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CX2SA > SATDIG 07.12.13 21:02l 210 Lines 5996 Bytes #999 (0) @ WW
BID : AMSATBB8446
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Subj: AMSAT-BB-digest V8 446
Path: IZ3LSV<IK2XDE<DB0RES<DB0ANF<CX2SA
Sent: 131207/2002Z @:CX2SA.SAL.URY.SA #:1247 [Salto] FBB7.00e $:AMSATBB8446
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AO-73 QSOs on the beacon? (wouter weggelaar)
2. Re: help MixW (Alan)
3. Re: AO-73 now on oscar.dcarr.org (Wouter Weggelaar)
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Message: 1
Date: Sat, 7 Dec 2013 13:06:24 +0100
From: wouter weggelaar <pa3weg@xxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-73 QSOs on the beacon?
Message-ID:
<CAKXf1rEtLbSUHLrP2fAWOL5pQTkPRLL4_pOK2y6Msc2kGDEMsw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi All,
>From a design perspective, the transponder would require about 30 to 40dB
more uplink power to produce a signal overlapping the telemetry. That
signal would then be a maximum of 9dB above telemetry, compared to the rest
of the transponder. Since the transponder is used, the power spreads
between users, further reducing the effect.
The telemetry signal and transponder are combined, with the telemetry
stepped down 9dB, and the filter rejection for the transponder at the
telemetry frequency is better than 30dB (40dB with some ripple, I measured
35dB rejection on the engineering model)
The AGC acts on the composite output, so if no-one is on the main passband,
the transponder will start running full gain (43dB extra). This will
possibly reduce the required uplink power to actually overlap the
telemetry. But this only happens on high power uplinks combined with no-one
running in the main passband.
As soon as someone triggers the AGC with a signal in the main passband, the
AGC will kill the overlap.
There also is FM-ing of the telemetry beacon, but this effect is small
(~100Hz), and the BPSK decoder can cope with it.
I think it is more likely that AO-7 was up, or some local intermod is
producing this effect, but this effect being on the satellite can not be
completely excluded. Thanks for sharing this information!
Wouter PA3WEG
FUNcube RF Board designer
On Sat, Dec 7, 2013 at 8:25 AM, Michael Fletcher <oh2aue@xxxxxxxx.xx> wrote:
>
> Subject: [amsat-bb] Re: AO-73 QSOs on the beacon?
>> From: Michael Fletcher <oh2aue@xxxxxxxxxxx>
>> Date: Fri, 6 Dec 2013 08:55:41 +0200 (EET)
>>
>>
>> AO-7, mode B, happens pretty often...
>>
>
> As I noted earlier, the only few times I have heard traffic _on_
> the AO-73 beacon frequency is when AO-7 is above the horizon
> in the sun and in Mode B. VO-52 downlink traffic comes close too
> occasionally, due to Doppler and orbits, but not _onto_ the beacon per se.
>
> And my ancient FCD is running just fine, with a highly selective
> HB LNA and a very sharp multicavity notch for my local APRS
> repeater at 144.800 MHz.
>
> Michael OH2AUE
>
>
> --
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
>
------------------------------
Message: 2
Date: Sat, 7 Dec 2013 08:56:34 -0600
From: Alan <wa4sca@xxxxx.xxx>
To: "'Nick Pugh K5QXJ'" <quadpugh@xxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Cc: CC <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: help MixW
Message-ID: <912F293A7EF144BA9F4C9886CAEE8BFD@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Nick,
A quick look did not show a playback mode, though I could well have missed
it. When I want to do this
I use Virtual Audio Cables to go from the player of choice, usually
Audacity, to the target program.
The typical Flex settings work fine. I have used this with many terrestrial
and space modes. It is
much better to use wave files if available, though mp3 will usually work
with low baud rate, robust
decoding systems.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: amsat-bb-bounces@xxxxx.xxx
<[mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Nick Pugh K5QXJ
<Sent: Saturday, December 07, 2013 4:31 AM
<To: amsat-bb@xxxxx.xxx
<Subject: [amsat-bb] help mixw
<
<Is there a way to connect a prerecorded mp3 file to mixw ?
<
<
<
<nick
<
<
<
<
<
<Thanks
<
<
<
<nick
<
<Office 337 593 8700
<
<Cell 337 258 2527
<
<
<
<Helping UL become a world Class Engineering and Educational School
<
<
<
<_______________________________________________
<Sent via AMSAT-BB@xxxxx.xxx. 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
<
------------------------------
Message: 3
Date: Sat, 7 Dec 2013 16:12:57 +0100
From: Wouter Weggelaar <wouterweg@xxxxx.xxx>
To: David Carr <dc@xxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-73 now on oscar.dcarr.org
Message-ID:
<CAKXf1rGmfXoY4VR+6urjF1Gz_E24DaPLXtPBZS=gBRwO1m1bAg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi David,
Thank you on behalf of the FUNcube-1 team!
I hope the satellite status page will be used by many to indicate the
activity.
It would be nice to see the nighttime/daytime schedule appear in the data
as Active / Telemetry only!
Wouter PA3WEG
FUNcube team
On Sun, Dec 1, 2013 at 7:06 AM, David Carr <dc@xxxxx.xxx> wrote:
>
> I have been out of town for several days, but AO-73 should now be active
> on oscar.dcarr.org. Please enjoy!
>
> 73s,
> David Carr
> KD5QGR
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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 amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 8, Issue 446
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