[OZAPRS] [amsat-bb] Falconsat-3 Test 2 - Signalink USB Sound Card 9k6

[Mark Jessop]

A vertical will definitely not be ideal for satellite reception:
- Your gain is in the wrong place (for the most part)
- Depending on spacecraft orientation (and the TLE's don't tell you this!),
you may have significant polarisation loss.

Do we have any information on if the satellite is transmitting linearly or
circularly polarised? (my guess is linear, like pretty much everything on
70cm up there)

With regards to receive systems, i've had *some* success with a 70cm
turnstile + MiniKits 70cm masthead preamp, on my 70cm SatNOGS ground
station.

I'm not 100% sure the pattern on the turnstile is a quite right, I think
it's a bit narrow. I also have various obstructions around the antenna
which produce nulls in interesting directions.
A plot from a recent-ish observation is here:
https://network.satnogs.org/observations/19338/
That strong interferer doesn't help the FSK9k6 demodulator much either...

I've got a few FalconSat passes queued up for the next few hours:
https://network.satnogs.org/observations/19670/
https://network.satnogs.org/observations/19671/
Data will show up on these pages after the observations have occurred in a
few hours.

At some point I'll see what I can get with my Kenwood TH-D72 and a yagi
antenna.

73
Mark VK5QI



On Thu, Oct 12, 2017 at 5:29 PM, Andrew Rich <vk4tec at tech-software.net>
wrote:

> I did not see a lot of signal - I am not convinced my SNR is good enough
>
> I would like to try a hill and a yagi
>
> Andrew
>
>
> > On 12 Oct 2017, at 4:54 pm, Rick Kowalewski <rick at vk6xlr.net> wrote:
> >
> > Sure it can:
> >
> > Here's copied data from a few days ago:
> > 1:Fm PFS3-1 To TLMC-1 <UI R Pid=F0 Len=4> [20:56:49R] [AA] [+--++--]CL:0
> > 1:Fm PFS3-1 To LSTAT <UI R Pid=F0 Len=46> [20:56:49R] [AA] [---+---]I
> P:0x13A8 o:0 l:26062 f:26092, d:1 st:6 e:cb
> > 1:Fm PFS3-1 To TIME-1 <UI R Pid=F0 Len=64> [20:56:58R] [AN]
> [-------]PHT: uptime is 707/07:49:24.  Time is Fri Oct 06 12:57:53 2017
> > 1:Fm PFS3-11 To PBLIST <UI R Pid=F0 Len=11> [20:59:01R] [NN]
> [+--+---]PB: Empty.
> >
> > On 12/10/2017 14:29, Andrew Rich wrote:
> >> ICOM 910H
> >>
> >> 9k6 ON
> >>
> >> Signalink with UZ7HO sound modem FSM G3RUH 9600 baud
> >>
> >> Elevation 89.4 degrees
> >>
> >> MacDoppler correction 435.112 MHz to 435.xxx MHz
> >>
> >> No Packets copied
> >>
> >> 435.112 MHz Start heard a change in static
> >>
> >> I am not convinced the SignalLink can do it
> >>
> >> I am going to move across to a my FunCube Dongle and use Software
> Defined Radio to try and snag it
> >>
> >> Will report back
> >>
> >> I can certainly hear the 9k6 rush from the bird
> >>
> >> Diamond X300 BS antenna LDF4-50
> >>
> >> Andrew VK4TEC
> >
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