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CX2SA > SATDIG 26.07.19 23:13l 942 Lines 30064 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
(Robert Bruninga)
2. Using JPL Horizons Ephemerides Data (Reid Crowe)
3. Re: Using JPL Horizons Ephemerides Data (Reid Crowe)
4. Re: Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
(Alan Johnston)
5. Re: Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
(Robert Bruninga)
6. Re: Using JPL Horizons Ephemerides Data (Zach Leffke)
7. Re: Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
(Alan Johnston)
8. Antenna Question (Brad Smith)
9. Re: Antenna Question (Zach Metzinger)
10. Re: Antenna Question (Greg D)
----------------------------------------------------------------------
Message: 1
Date: Fri, 26 Jul 2019 08:20:39 -0400
From: Robert Bruninga <bruninga@????.???>
To: amsat bb <amsat-bb@?????.???>
Cc: Jeff King <jking@????.???>, Jin Kang <kang@????.???>
Subject: Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse
-UPDATE
Message-ID: <0db77ade5eed364b9d306079764970c5@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
USNAP1 on 145.825 also uses the call of
USNA14 on 437.605 MHz 9600 baud
And has been added to the http://aprs.org/sats.html web page
*From:* Robert Bruninga <bruninga@????.???>
*Sent:* Thursday, July 25, 2019 11:56 PM
*To:* amsat bb <amsat-bb@?????.???>
*Cc:* Jin Kang <kang@????.???>; Jeffery King <jking@????.???>; Robert
Bruninga <bruninga@????.???>
*Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
FREQ is 437.605 (corrected)
Object is 44355
I captured objects via VK6HAM at 151929 to 152812 for PSAT2 and for USNAP1
from 151803 to 152711 showing USNA P1 about a minute ahead of PSAT2.
It is only alive for about 60 to 70 minutes when in the sun apparently by
looking at the T# telemetry count.
Bob
On Thu, Jul 25, 2019 at 11:42 PM Robert Bruninga <bruninga@????.???> wrote:
Standard 9600 baud AX.25. No special software. Just need raw packets.on
447.605
PSAT2 and USNAP1 were delppyed together and have identical external shape
and so should be in same orbit, but due to mass differences, USNAP1 should
be LEADING PSAT2. We need to know by houw much. Since PSAT2 is likely
object 44354, and 44355 is very slightly leading (by 1 minute) that could
be it.
Bob
On Thu, Jul 25, 2019 at 11:33 PM Jeff Moore via AMSAT-BB <amsat-bb@?????.???>
wrote:
So what do we need to copy the downlink data?? Is there an app or is it
straight ax.25 packet???
Jeff Moore -- KE7ACY
CN94
On Thu, Jul 25, 2019 at 8:27 PM Robert Bruninga via AMSAT-BB <
amsat-bb@?????.???> wrote:
> It looks liike PSAT2's sister cubesat finally woke up today (a month after
> launch) at 0614z on 25 July:
>
> http://www.findu.com/cgi-bin/raw.cgi?call=usnap1-1&time=1
>
> The VHF telemetry shown here has only bus voltage. The digipeater is OFF
> and will remain off until we find out what happened.
>
> In the mean time, we need all the capture we can get of the 9600 baud
> downlink on 437.605 MHz +/- Doppler. There is a beacon every 30 seconds.
>
> Bob, WB4APR
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Fri, 26 Jul 2019 10:43:43 -0500
From: Reid Crowe <reid.crowe@?????.???>
To: AMSAT <amsat-bb@?????.???>
Subject: [amsat-bb] Using JPL Horizons Ephemerides Data
Message-ID:
<CA+PU+9hcpfKNEL5d6NrazejDe-KumpbjvsA_GMb-zspH40E=OQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Is there a way to use (or convert) JPL Horizons Ephemerides data with
tracking programs like SatPC32 that use Two Line Elements?
73,
Reid N0RC
------------------------------
Message: 3
Date: Fri, 26 Jul 2019 10:53:09 -0500
From: Reid Crowe <reid.crowe@?????.???>
To: AMSAT <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Using JPL Horizons Ephemerides Data
Message-ID:
<CA+PU+9hyerbDhzAtshFSrcrFJKbFdo8Ohivz6hscxoLJQogBmQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Looks like someone is already on it:
https://twitter.com/coastal8049/status/1154760899522994177
73,
Reid N0RC
On Fri, Jul 26, 2019 at 10:43 AM Reid Crowe <reid.crowe@?????.???> wrote:
>
> Is there a way to use (or convert) JPL Horizons Ephemerides data with
> tracking programs like SatPC32 that use Two Line Elements?
>
> 73,
>
> Reid N0RC
------------------------------
Message: 4
Date: Fri, 26 Jul 2019 12:26:13 -0400
From: Alan Johnston <alan.b.johnston@?????.???>
To: Robert Bruninga <bruninga@????.???>
Cc: amsat bb <amsat-bb@?????.???>, Jeff King <jking@????.???>, Jin
Kang <kang@????.???>
Subject: Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse
-UPDATE
Message-ID:
<CAKhHsXERT7hr5s7c=-8WO-AbDO9k80fSbuRZmJyZ01wSA3T_VQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi Bob,
At SatNOGS, we are getting some good 437.605 MHz 9k6 signals from
BRICSat-2/USNAP-1 . They haven't automatically decoded yet, perhaps due to
the 5kHz frequency offset. But you can download the audio file and you
should be able to decode them.
Here are some good ones:
https://network.satnogs.org/observations/861257/
https://network.satnogs.org/observations/861256/
https://network.satnogs.org/observations/861250/
Future good observations will be displayed here:
https://network.satnogs.org/observations/?future=0&bad=0&unvetted=0&failed=0&n
orad=99970&observer=&station=&start-time=&end-time=
Good luck!!
73,
Alan
KU2Y
On Fri, Jul 26, 2019 at 8:22 AM Robert Bruninga via AMSAT-BB <
amsat-bb@?????.???> wrote:
> USNAP1 on 145.825 also uses the call of
>
> USNA14 on 437.605 MHz 9600 baud
>
>
>
> And has been added to the http://aprs.org/sats.html web page
>
>
>
> *From:* Robert Bruninga <bruninga@????.???>
> *Sent:* Thursday, July 25, 2019 11:56 PM
> *To:* amsat bb <amsat-bb@?????.???>
> *Cc:* Jin Kang <kang@????.???>; Jeffery King <jking@????.???>; Robert
> Bruninga <bruninga@????.???>
> *Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
>
>
>
> FREQ is 437.605 (corrected)
>
> Object is 44355
>
> I captured objects via VK6HAM at 151929 to 152812 for PSAT2 and for USNAP1
> from 151803 to 152711 showing USNA P1 about a minute ahead of PSAT2.
>
> It is only alive for about 60 to 70 minutes when in the sun apparently by
> looking at the T# telemetry count.
>
> Bob
>
>
>
> On Thu, Jul 25, 2019 at 11:42 PM Robert Bruninga <bruninga@????.???>
> wrote:
>
> Standard 9600 baud AX.25. No special software. Just need raw packets.on
> 447.605
>
> PSAT2 and USNAP1 were delppyed together and have identical external shape
> and so should be in same orbit, but due to mass differences, USNAP1 should
> be LEADING PSAT2. We need to know by houw much. Since PSAT2 is likely
> object 44354, and 44355 is very slightly leading (by 1 minute) that could
> be it.
>
> Bob
>
>
>
> On Thu, Jul 25, 2019 at 11:33 PM Jeff Moore via AMSAT-BB <
> amsat-bb@?????.???>
> wrote:
>
> So what do we need to copy the downlink data?? Is there an app or is it
> straight ax.25 packet???
>
> Jeff Moore -- KE7ACY
> CN94
>
> On Thu, Jul 25, 2019 at 8:27 PM Robert Bruninga via AMSAT-BB <
> amsat-bb@?????.???> wrote:
>
> > It looks liike PSAT2's sister cubesat finally woke up today (a month
> after
> > launch) at 0614z on 25 July:
> >
> > http://www.findu.com/cgi-bin/raw.cgi?call=usnap1-1&time=1
> >
> > The VHF telemetry shown here has only bus voltage. The digipeater is OFF
> > and will remain off until we find out what happened.
> >
> > In the mean time, we need all the capture we can get of the 9600 baud
> > downlink on 437.605 MHz +/- Doppler. There is a beacon every 30 seconds.
> >
> > Bob, WB4APR
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
> > are solely those of the author, and do not reflect the official views of
> > AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 5
Date: Fri, 26 Jul 2019 12:30:57 -0400
From: Robert Bruninga <bruninga@????.???>
To: Alan Johnston <alan.b.johnston@?????.???>
Cc: amsat bb <amsat-bb@?????.???>, Jeff King <jking@????.???>, Jin
Kang <kang@????.???>
Subject: Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse
-UPDATE
Message-ID: <6136710152fb4ce1a6ee7f04d3bd487d@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
We are guessing at the 437.605 center freq. It was purchased as 437.600
but we think we remember it did better at 437.605 on one of our radios.
Do you see an offset? If so, simply ceneter where you see it. And see if
decodes are better.
Thanks
Bob
*From:* Alan Johnston <alan.b.johnston@?????.???>
*Sent:* Friday, July 26, 2019 12:26 PM
*To:* Robert Bruninga <bruninga@????.???>
*Cc:* amsat bb <amsat-bb@?????.???>; Jeff King <jking@????.???>; Jin Kang <
kang@????.???>
*Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
Hi Bob,
At SatNOGS, we are getting some good 437.605 MHz 9k6 signals from
BRICSat-2/USNAP-1 . They haven't automatically decoded yet, perhaps due to
the 5kHz frequency offset. But you can download the audio file and you
should be able to decode them.
Here are some good ones:
https://network.satnogs.org/observations/861257/
https://network.satnogs.org/observations/861256/
https://network.satnogs.org/observations/861250/
Future good observations will be displayed here:
https://network.satnogs.org/observations/?future=0&bad=0&unvetted=0&failed=0&n
orad=99970&observer=&station=&start-time=&end-time=
Good luck!!
73,
Alan
KU2Y
On Fri, Jul 26, 2019 at 8:22 AM Robert Bruninga via AMSAT-BB <
amsat-bb@?????.???> wrote:
USNAP1 on 145.825 also uses the call of
USNA14 on 437.605 MHz 9600 baud
And has been added to the http://aprs.org/sats.html web page
*From:* Robert Bruninga <bruninga@????.???>
*Sent:* Thursday, July 25, 2019 11:56 PM
*To:* amsat bb <amsat-bb@?????.???>
*Cc:* Jin Kang <kang@????.???>; Jeffery King <jking@????.???>; Robert
Bruninga <bruninga@????.???>
*Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
FREQ is 437.605 (corrected)
Object is 44355
I captured objects via VK6HAM at 151929 to 152812 for PSAT2 and for USNAP1
from 151803 to 152711 showing USNA P1 about a minute ahead of PSAT2.
It is only alive for about 60 to 70 minutes when in the sun apparently by
looking at the T# telemetry count.
Bob
On Thu, Jul 25, 2019 at 11:42 PM Robert Bruninga <bruninga@????.???> wrote:
Standard 9600 baud AX.25. No special software. Just need raw packets.on
447.605
PSAT2 and USNAP1 were delppyed together and have identical external shape
and so should be in same orbit, but due to mass differences, USNAP1 should
be LEADING PSAT2. We need to know by houw much. Since PSAT2 is likely
object 44354, and 44355 is very slightly leading (by 1 minute) that could
be it.
Bob
On Thu, Jul 25, 2019 at 11:33 PM Jeff Moore via AMSAT-BB <amsat-bb@?????.???
>
wrote:
So what do we need to copy the downlink data?? Is there an app or is it
straight ax.25 packet???
Jeff Moore -- KE7ACY
CN94
On Thu, Jul 25, 2019 at 8:27 PM Robert Bruninga via AMSAT-BB <
amsat-bb@?????.???> wrote:
> It looks liike PSAT2's sister cubesat finally woke up today (a month after
> launch) at 0614z on 25 July:
>
> http://www.findu.com/cgi-bin/raw.cgi?call=usnap1-1&time=1
>
> The VHF telemetry shown here has only bus voltage. The digipeater is OFF
> and will remain off until we find out what happened.
>
> In the mean time, we need all the capture we can get of the 9600 baud
> downlink on 437.605 MHz +/- Doppler. There is a beacon every 30 seconds.
>
> Bob, WB4APR
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Fri, 26 Jul 2019 12:43:20 -0400
From: Zach Leffke <zleffke@??.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Using JPL Horizons Ephemerides Data
Message-ID: <10c1218d-c3e2-ce45-7fe5-88f5865f63a6@??.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Not an expert on this so will keep it short:
We had a student at VT look into this for tracking 'Deep Space' objects.
He figured out how to access the Horizons website via one of their
API's (not sure which) and then figured out how to 'shoehorn' the data
into python scripts that used the 'pyephem' package.
pyephem has been deprecated and replaced by 'SkyField' and is wayyy more
powerful and has support for things like an SGP4 propagator for
satellite tracking, and support for tracking astronomical objects (our
moon/sun for EME'rs on the list and for future Amateur Radio on the
Lunar Gateway, Jupiter+moons, other radio astronomy sources, etc....). I
think even directly supports this kind of thing through a 'jplephem'
package (where it gets the ephemeride data for planets, moons, etc...).
So might be as easy as download from Horizons (if not directly
accessible in skyfield), load into skyfield.....yadda yadda yadda
(seinfeld reference)......get pointing/doppler data for deep space objects.
Bottom line, for those interested in custom software, should look into
'skyfield' to maybe work with this type of data in python (along with
TLE data) and there's probably a way to 'export' the ephemerides into
TLE format so that the results can be used to 'spoof' existing tracking
programs (technically, SGP4+TLEs are only valid for 'near earth'
tracking, not even the right algorithm for Lunar/Solar tracking, that's
why I say 'spoof').
https://rhodesmill.org/skyfield/
-Zach, KJ4QLP
Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
On 7/26/2019 11:53 AM, Reid Crowe via AMSAT-BB wrote:
> Looks like someone is already on it:
> https://twitter.com/coastal8049/status/1154760899522994177
>
> 73,
>
> Reid N0RC
>
> On Fri, Jul 26, 2019 at 10:43 AM Reid Crowe <reid.crowe@?????.???> wrote:
>>
>> Is there a way to use (or convert) JPL Horizons Ephemerides data with
>> tracking programs like SatPC32 that use Two Line Elements?
>>
>> 73,
>>
>> Reid N0RC
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 7
Date: Fri, 26 Jul 2019 12:50:05 -0400
From: Alan Johnston <alan.b.johnston@?????.???>
To: Robert Bruninga <bruninga@????.???>
Cc: amsat bb <amsat-bb@?????.???>, Jeff King <jking@????.???>, Jin
Kang <kang@????.???>
Subject: Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse
-UPDATE
Message-ID:
<CAKhHsXGcLfS1pkxRLW56dCu1xhUvS_gn4f5etm_HGdNLBUB7ug@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi Bob,
Fredy at SatNOGS managed to decode one frame from these observations:
[0.4] USNA14-5>APUSNA,TELEM:{BR0000003463,0000003463,BV7.5,BT23,BC+166,BB57,
12B3,5B47,3B54,XV6.5,X+C6,X+T-9,X-C360,X-T23,YV3.8,Y+C6,Y+T-10,Y-C190
,Y-T63,ZV3.4,Z-C53,Z-T0,XG-13.2,YG-19.0,ZG2.4,XM-51.9,YM-134.3,ZM317.4,GT7,
0100 ------ U frame UI: p/f=0, No layer 3 protocol implemented., length =
219 dest APUSNA 0 c/r=0 res=3 last=0 source USNA14 5 c/r=0 res=3 last=0
digi 1 TELEM 0 h=0 res=3 last=1 000: 82 a0 aa a6 9c 82 60 aa a6 9c 82 62 68
6a a8 8a ......`....bhj.. 010: 98 8a 9a 40 61 03 f0 7b 42 52 30 30 30 30 30
30 ...@?..????????? 020: 33 34 36 33 2c 30 30 30 30 30 30 33 34 36 33 2c
3463,0000003463, 030: 42 56 37 2e 35 2c 42 54 32 33 2c 42 43 2b 31 36
BV7.5,BT23,BC+16 040: 36 2c 42 42 35 37 2c 31 32 42 33 2c 35 42 34 37
6,BB57,12B3,5B47 050: 2c 33 42 35 34 2c 58 56 36 2e 35 2c 58 2b 43 36
,3B54,XV6.5,X+C6 060: 2c 58 2b 54 2d 39 2c 58 2d 43 33 36 30 2c 58 2d
,X+T-9,X-C360,X- 070: 54 32 33 2c 59 56 33 2e 38 2c 59 2b 43 36 2c 59
T23,YV3.8,Y+C6,Y 080: 2b 54 2d 31 30 2c 59 2d 43 31 39 30 2c 59 2d 54
+T-10,Y-C190,Y-T 090: 36 33 2c 5a 56 33 2e 34 2c 5a 2d 43 35 33 2c 5a
63,ZV3.4,Z-C53,Z 0a0: 2d 54 30 2c 58 47 2d 31 33 2e 32 2c 59 47 2d 31
-T0,XG-13.2,YG-1 0b0: 39 2e 30 2c 5a 47 32 2e 34 2c 58 4d 2d 35 31 2e
9.0,ZG2.4,XM-51. 0c0: 39 2c 59 4d 2d 31 33 34 2e 33 2c 5a 4d 33 31 37
9,YM-134.3,ZM317 0d0: 2e 34 2c 47 54 37 2c 30 31 30 30 .4,GT7,0100 ------
We were curious why 9k6 was chosen, as it seems to be difficult to decode
even with these strong signals on a high pass.
73,
Alan
KU2Y
On Fri, Jul 26, 2019 at 12:31 PM Robert Bruninga <bruninga@????.???> wrote:
> We are guessing at the 437.605 center freq. It was purchased as 437.600
> but we think we remember it did better at 437.605 on one of our radios.
>
>
>
> Do you see an offset? If so, simply ceneter where you see it. And see if
> decodes are better.
>
> Thanks
>
> Bob
>
>
>
> *From:* Alan Johnston <alan.b.johnston@?????.???>
> *Sent:* Friday, July 26, 2019 12:26 PM
> *To:* Robert Bruninga <bruninga@????.???>
> *Cc:* amsat bb <amsat-bb@?????.???>; Jeff King <jking@????.???>; Jin Kang
> <kang@????.???>
> *Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse
> -UPDATE
>
>
>
> Hi Bob,
>
>
>
> At SatNOGS, we are getting some good 437.605 MHz 9k6 signals from
> BRICSat-2/USNAP-1 . They haven't automatically decoded yet, perhaps due to
> the 5kHz frequency offset. But you can download the audio file and you
> should be able to decode them.
>
>
>
> Here are some good ones:
>
>
>
> https://network.satnogs.org/observations/861257/
>
> https://network.satnogs.org/observations/861256/
>
> https://network.satnogs.org/observations/861250/
>
>
>
> Future good observations will be displayed here:
>
>
>
>
>
https://network.satnogs.org/observations/?future=0&bad=0&unvetted=0&failed=0&n
orad=99970&observer=&station=&start-time=&end-time=
>
>
>
> Good luck!!
>
>
>
> 73,
>
> Alan
>
> KU2Y
>
>
>
> On Fri, Jul 26, 2019 at 8:22 AM Robert Bruninga via AMSAT-BB <
> amsat-bb@?????.???> wrote:
>
> USNAP1 on 145.825 also uses the call of
>
> USNA14 on 437.605 MHz 9600 baud
>
>
>
> And has been added to the http://aprs.org/sats.html web page
>
>
>
> *From:* Robert Bruninga <bruninga@????.???>
> *Sent:* Thursday, July 25, 2019 11:56 PM
> *To:* amsat bb <amsat-bb@?????.???>
> *Cc:* Jin Kang <kang@????.???>; Jeffery King <jking@????.???>; Robert
> Bruninga <bruninga@????.???>
> *Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
>
>
>
> FREQ is 437.605 (corrected)
>
> Object is 44355
>
> I captured objects via VK6HAM at 151929 to 152812 for PSAT2 and for USNAP1
> from 151803 to 152711 showing USNA P1 about a minute ahead of PSAT2.
>
> It is only alive for about 60 to 70 minutes when in the sun apparently by
> looking at the T# telemetry count.
>
> Bob
>
>
>
> On Thu, Jul 25, 2019 at 11:42 PM Robert Bruninga <bruninga@????.???>
> wrote:
>
> Standard 9600 baud AX.25. No special software. Just need raw packets.on
> 447.605
>
> PSAT2 and USNAP1 were delppyed together and have identical external shape
> and so should be in same orbit, but due to mass differences, USNAP1 should
> be LEADING PSAT2. We need to know by houw much. Since PSAT2 is likely
> object 44354, and 44355 is very slightly leading (by 1 minute) that could
> be it.
>
> Bob
>
>
>
> On Thu, Jul 25, 2019 at 11:33 PM Jeff Moore via AMSAT-BB <
> amsat-bb@?????.???>
> wrote:
>
> So what do we need to copy the downlink data?? Is there an app or is it
> straight ax.25 packet???
>
> Jeff Moore -- KE7ACY
> CN94
>
> On Thu, Jul 25, 2019 at 8:27 PM Robert Bruninga via AMSAT-BB <
> amsat-bb@?????.???> wrote:
>
> > It looks liike PSAT2's sister cubesat finally woke up today (a month
> after
> > launch) at 0614z on 25 July:
> >
> > http://www.findu.com/cgi-bin/raw.cgi?call=usnap1-1&time=1
> >
> > The VHF telemetry shown here has only bus voltage. The digipeater is OFF
> > and will remain off until we find out what happened.
> >
> > In the mean time, we need all the capture we can get of the 9600 baud
> > downlink on 437.605 MHz +/- Doppler. There is a beacon every 30 seconds.
> >
> > Bob, WB4APR
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
> > are solely those of the author, and do not reflect the official views of
> > AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>
>
------------------------------
Message: 8
Date: Fri, 26 Jul 2019 21:15:58 +0000 (UTC)
From: Brad Smith <corlissbs@???.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Antenna Question
Message-ID: <850953008.960727.1564175758933@????.?????.???>
Content-Type: text/plain; charset=UTF-8
I have two Arrow 2 antennas and have been using them since 2013 on FM
satellites. I use a Kenwood TH-D72 radio which is full duplex, so I can hear
myself very well when I get into the bird. I am wondering about a phenomenon
that I experience and why it happens.
It is much easier for me to hit the bird (and I have a much louder signal)
when the bird is just about on the horizon than when it is directly
overhead, or at a very high altitude. This should not be the case, as
overhead it is only 400 miles away, but on the horizon, it is 2,000 miles
away. But I am so much louder at the horizon. I "boom" into the bird. Does
anyone have any answer to why this is?
Brad KC9UQR
------------------------------
Message: 9
Date: Fri, 26 Jul 2019 16:34:11 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Antenna Question
Message-ID: <f22710ad-acc8-fc2e-1986-c444fd389129@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 2019-07-26 16:15, Brad Smith via AMSAT-BB wrote:
> I have two Arrow 2 antennas and have been using them since 2013 on FM
satellites. I use a Kenwood TH-D72 radio which is full duplex, so I can hear
myself very well when I get into the bird. I am wondering about a phenomenon
that I experience and why it happens.
>
> It is much easier for me to hit the bird (and I have a much louder signal)
when the bird is just about on the horizon than when it is directly
overhead, or at a very high altitude. This should not be the case, as
overhead it is only 400 miles away, but on the horizon, it is 2,000 miles
away. But I am so much louder at the horizon. I "boom" into the bird. Does
anyone have any answer to why this is?
Hello Brad,
"Louder" is more S-meter bars, or audibly louder?
The received RF power should be greater overhead (twist your antenna a
bit to change polarization and check). This results in more S-meter bars.
Is the horizon, for you, over a relatively unpopulated area? Do you live
in a more populated area?
Demodulated audio may be quieter due to the myriad of people trying to
cram into one channel and the uplink FM receiver PLL tracking the
resulting chaos. This is my guess, as I haven't done analysis on the
effect.
--- Zach
N0ZGO
------------------------------
Message: 10
Date: Fri, 26 Jul 2019 15:04:11 -0700
From: Greg D <ko6th.greg@?????.???>
To: Zach Metzinger <zmetzing@?????.???>, amsat-bb@?????.???
Subject: Re: [amsat-bb] Antenna Question
Message-ID: <fe53f3bc-2b32-80ae-6ef7-ad473211f03f@?????.???>
Content-Type: text/plain; charset=us-ascii
Zach Metzinger via AMSAT-BB wrote:
> On 2019-07-26 16:15, Brad Smith via AMSAT-BB wrote:
>> I have two Arrow 2 antennas and have been using them since 2013 on FM
>> satellites. I use a Kenwood TH-D72 radio which is full duplex, so I
>> can hear myself very well when I get into the bird. I am wondering
>> about a phenomenon that I experience and why it happens.
>>
>> It is much easier for me to hit the bird (and I have a much louder
>> signal) when the bird is just about on the horizon than when it is
>> directly overhead, or at a very high altitude. This should not be the
>> case, as overhead it is only 400 miles away, but on the horizon, it
>> is 2,000 miles away. But I am so much louder at the horizon. I "boom"
>> into the bird. Does anyone have any answer to why this is?
>
> Hello Brad,
>
> "Louder" is more S-meter bars, or audibly louder?
>
> The received RF power should be greater overhead (twist your antenna a
> bit to change polarization and check). This results in more S-meter bars.
>
> Is the horizon, for you, over a relatively unpopulated area? Do you
> live in a more populated area?
>
> Demodulated audio may be quieter due to the myriad of people trying to
> cram into one channel and the uplink FM receiver PLL tracking the
> resulting chaos. This is my guess, as I haven't done analysis on the
> effect.
>
> --- Zach
> N0ZGO
There is also the effect of the reflection off the Earth that can add
3db to your received signal on low passes. I believe this is well used
by EME operators. But I don't think that fully makes up for the
distance penalty. There is also the effect that the satellite's
radiation pattern isn't necessarily equal in all directions, and other
than the ISS, most are tumbling somewhat at random. That, I think,
could be the main cause of the different signal reports.
Greg KO6TH
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@?????.???.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 14, Issue 282
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