Re: Fwd: Re: Confirmed KMS-4 Radio Reception on UHF

From: David Tiller via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 10 Feb 2016 13:23:48 +0000
You guys probably already know this, but I found some info on Metop-A here: http://www.wmo-sat.info/oscar/satellites/view/306

Service	Dir	Frequency	Emission designator	Bandwidth	Polarisation	D/A	Data rate or Baseband	Comments
ADCS	S-E	465.9875 MHz	1K00G1D	        1  kHz	       RHCP	        D	0.2/0.4  kbps	                        DCP configuration control

If you can analyze the signal and determine if the bandwidth is approximately 1kHz and the data rate is close to 200 or 400 bps, you may be able to confirm or eliminate metop-a from consideration. If you have a RHCP antenna, you could also check to see if the deep fading you mentioned goes away.

--
David Tiller
Lead Consultant/Architect | CapTech
(804) 304-0638 | dtiller_at_captechconsulting.com

________________________________________
From: Seesat-l <seesat-l-bounces+dtiller=captechconsulting.com_at_satobs.org> on behalf of Satcom via Seesat-l <seesat-l_at_satobs.org>
Sent: Wednesday, February 10, 2016 2:51 AM
To: seesat-l_at_satobs.org
Subject: Re: Fwd: Re: Confirmed KMS-4 Radio Reception on UHF

If it does turn out to be Metop-A , its an understandable mistake Scott.
Better to have tried and failed than failed to try!
Plus it helps others to illiminate possible contenders.




Best wishes

John





On 10/02/2016 07:41, Scott Tilley via Seesat-l wrote:
> Sorry I meant PST not PDT in the post below.
>
> s
>
> On 2/9/2016 11:16 PM, Scott Tilley via Seesat-l wrote:
>> Hi All
>>
>> I'm not so sure after some further analysis.
>>
>> I suspect the signal I copied could be Metop-A, 29499 as I just copied
>> it again at the predicted time for Metop-A during its pass around 11pm
>> PDT.
>>
>> I would give my previous reports much suspicion based on this
>> observation.
>>
>> Begin passes prediction from 18:13:59 2016.02.09 to 02:13:59
>> 2016.02.10 PDT
>> ______________________________________________________________________________________________________________________
>>
>> satellite______________|int. des.___|number|el._|sat.
>> mag._|rise________________|set_________________|data age|pass___|
>> METOP-A                 2006-044A     29499   22        6.5 19:31:03
>> 2016.02.09  19:44:44 2016.02.09      0.3    13.7
>> KMS 4                   2016-009A     41332   32          ? 19:35:12
>> 2016.02.09  19:46:02 2016.02.09      0.1    10.8
>> KMS 4                   2016-009A     41332   21          ? 21:08:54
>> 2016.02.09  21:19:19 2016.02.09      0.2    10.4
>> METOP-A                 2006-044A     29499   70        7.2 21:09:48
>> 2016.02.09  21:25:14 2016.02.09      0.3    15.4
>> METOP-A                 2006-044A     29499   11        8.7 22:52:41
>> 2016.02.09  23:04:28 2016.02.09      0.4    11.8
>> ______________________________________________________________________________________________________________________
>>
>>
>> Regards,
>> Scott
>>
>>
>>
>>
>>
>> On 2/9/2016 11:01 PM, Satcom via Seesat-l wrote:
>>>
>>>
>>>
>>>
>>> From: Satcom <john_at_satcom.freeserve.co.uk>
>>> To: Scott Tilley <sthed475_at_telus.net>
>>>
>>> If it helps , I played Scotts wav file through SDR sharp....the signal
>>> id definitely there , and pretty strong.
>>> Here is a grab from the visualisation.
>>>
>>> https://drive.google.com/file/d/0B4g1kKs0cR7ZNFlwenlyazBvYUE/view?usp=sharing.
>>>
>>>
>>>
>>> My guess.... Scott is spot on with his assumption that this is KMS-4
>>>
>>> Regards
>>>
>>> John
>>>
>>>
>>>
>>>
>>> On 10/02/2016 05:35, Scott Tilley via Seesat-l wrote:
>>>> Further to my last, I have copied a second pass with timings that
>>>> closely match Spacetrack TLEs.
>>>>
>>>> The signal is weak and experiences deep fades with obvious modulation.
>>>> Hear the recording below to form you're own opinion.
>>>>
>>>> The signal seems to have drifted up in overall frequency since last
>>>> orbit.
>>>>
>>>> Here's a 75MB wav file of the entire pass that anyone can hear. I
>>>> screwed up making a wideband recording due to unfamilaritity with the
>>>> software but I hope it helps with the analysis.  It's just demodulated
>>>> audio not the raw 190KHz bandwidth.  It starts off uninteresting but
>>>> gets very loud with signal a few minutes in around (6-7 minutes) and
>>>> near the end of the pass.  Best viewed with something that can
>>>> visualize
>>>> the signal.
>>>>
>>>> https://dl.dropboxusercontent.com/u/15916951/Record0_20160210_050859.wav
>>>>
>>>>
>>>> Regards,
>>>> Scott
>>>>
>>>> _______________________________________________
>>>> Seesat-l mailing list
>>>> http://mailman.satobs.org/mailman/listinfo/seesat-l
>>>>
>>>
>>>
>>>
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--
Best wishes

John

PP Support

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Received on Wed Feb 10 2016 - 07:24:39 UTC

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