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CX2SA > SATDIG 07.06.18 15:54l 851 Lines 31677 Bytes #999 (0) @ WW
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Sent: 180607/1336Z @:CX2SA.SAL.URY.SOAM #:45258 [Salto] FBB7.00e $:AMSATBB13195
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Unsuccessful Uplinks - AO-92 (Daniel Wight)
2. Re: Unsuccessful Uplinks - AO-92 (Gabriel Zeifman)
3. Re: : DSLWP: First Amateur Radio Transmissions from
(N6RFM1 gmail)
4. Re: Unsuccessful Uplinks - AO-92 (Hugo Dominguez, Jr.)
5. Oscar News #220 - Your input will be very welcome
(Graham Shirville)
6. DSLWP UHF Test Plan 7 Jun & 8 Jun (???)
7. AMSAT at Ham-Com, June 8-10, 2018 (Mac A. Cody)
8. Re: Unsuccessful Uplinks - AO-92 (Daniel Wight)
9. Re: Unsuccessful Uplinks - AO-92 (k5oe@???.????
10. Re: Unsuccessful Uplinks - AO-92 (k6vug@?????????.????
----------------------------------------------------------------------
Message: 1
Date: Wed, 6 Jun 2018 21:07:55 -0700
From: Daniel Wight <kd7lee@?????.???>
To: Andrew Glasbrenner <glasbrenner@??????????.???>
Cc: "Hugo Dominguez, Jr." <hugois@?????.???>, amsat-bb@?????.???
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID:
<CADWh2KrDrhNg9iiRxKLOT2m3fLiPgs4OJVDSZgfzhMPMacqnCA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Seems like your Doppler shift might be opposite. I normally start high &
work my way down during the satellite pass... (For instance, I would start
at 435.180 for AO-85 and then work my way down to 435.160 as the satellite
'sunsets' on my horizon). Doppler shift should be higher frequency during
approach, near zero when the satellite is overhead, and lower after the
satellite passes.
73,
Daniel, KD7LEE
On Wed, Jun 6, 2018, 17:27 Andrew Glasbrenner <glasbrenner@??????????.???>
wrote:
> You've discovered one of the reasons full duplex is best on the FM
> sats...you have no idea if you are getting through, because you can't hear
> while transmitting.
>
> Got another radio so you can work full duplex?
>
> 73, Drew KO4MA
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez,
> Jr.
> Sent: Wednesday, June 06, 2018 7:41 PM
> To: amsat-bb@?????.???
> Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
>
> I?ve just started playing with talking on satellites. I?m able to hear all
> the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed on my
> Kenwood TH-D74, which I use with my Elk dual band periodic log antenna.
> However no one can hear me or responds to me. I?ve only been successful
> with my uplink (being heard) on AO-91 on several passes. I triple checked
> my frequencies on my radio and the 67 Hz tone and they are set as follows:
> Sat. Xmit Tone
> SO-50 145.850 67.0 Hz
> AO-85 435.170 67.0 Hz
> AO-91 435.250 67.0 HZ
> AO-92 435.350 67.0 Hz
> These are the frequencies used when the bird is at its peak. I adjust for
> doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
> 435.170, 435.175, 435.180.
>
> Any ideas if something has changed from what is published or am I missing
> something? Like I said, i?ve been able to communicate on AO-91.
>
> ?
> Hugo Dominguez, Jr.
> _______________________________________________
> 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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 2
Date: Wed, 6 Jun 2018 20:23:31 -0800
From: Gabriel Zeifman <gabrielzeifman@?????.???>
Cc: "Hugo Dominguez, Jr." <hugois@?????.???>, amsat-bb@?????.???
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID:
<CAEGYLCvAKFK4CZx4+HZoXyThhMEUcRZjG5ADUGX4j2z9mMDZWg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
This is incorrect. This would be true for V/u but is reverse for U/v as
Doppler is making the apparent received frequency at the satellite higher
as the satellite is flying towards the ground based transmitter.
73,
Gabe
AL6D/VE6NJH
On Wed, Jun 6, 2018, 8:14 PM Daniel Wight <kd7lee@?????.???> wrote:
> Seems like your Doppler shift might be opposite. I normally start high &
> work my way down during the satellite pass... (For instance, I would start
> at 435.180 for AO-85 and then work my way down to 435.160 as the satellite
> 'sunsets' on my horizon). Doppler shift should be higher frequency during
> approach, near zero when the satellite is overhead, and lower after the
> satellite passes.
>
> 73,
>
> Daniel, KD7LEE
>
> On Wed, Jun 6, 2018, 17:27 Andrew Glasbrenner <glasbrenner@??????????.???>
> wrote:
>
> > You've discovered one of the reasons full duplex is best on the FM
> > sats...you have no idea if you are getting through, because you can't
> hear
> > while transmitting.
> >
> > Got another radio so you can work full duplex?
> >
> > 73, Drew KO4MA
> >
> > -----Original Message-----
> > From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez,
> > Jr.
> > Sent: Wednesday, June 06, 2018 7:41 PM
> > To: amsat-bb@?????.???
> > Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
> >
> > I?ve just started playing with talking on satellites. I?m able to hear
> all
> > the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed on
> my
> > Kenwood TH-D74, which I use with my Elk dual band periodic log antenna.
> > However no one can hear me or responds to me. I?ve only been successful
> > with my uplink (being heard) on AO-91 on several passes. I triple checked
> > my frequencies on my radio and the 67 Hz tone and they are set as
> follows:
> > Sat. Xmit Tone
> > SO-50 145.850 67.0 Hz
> > AO-85 435.170 67.0 Hz
> > AO-91 435.250 67.0 HZ
> > AO-92 435.350 67.0 Hz
> > These are the frequencies used when the bird is at its peak. I adjust for
> > doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
> > 435.170, 435.175, 435.180.
> >
> > Any ideas if something has changed from what is published or am I missing
> > something? Like I said, i?ve been able to communicate on AO-91.
> >
> > ?
> > Hugo Dominguez, Jr.
> > _______________________________________________
> > 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: http://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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 3
Date: Thu, 7 Jun 2018 00:36:07 -0400
From: "N6RFM1 gmail" <n6rfm1@?????.???>
To: <amsat-bb@?????.???>
Cc: robert.ehresman@?????.???
Subject: Re: [amsat-bb] : DSLWP: First Amateur Radio Transmissions
from
Message-ID: <010301d3fe19$0ecd2800$2c677800$@?????.???>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bob,
As you have read in earlier posts, several of us (and the list grows slowly
I think) have been able to both receive and decode signals. My
understanding is that early in the launch PY2SDR, CD3NDC, PY4ZBZ, K4KDR and
myself received signals. By some quirk of fate, I was able to report the
first properly decoded packet back to the team?s server.
The setup here ? 11 elements on 70cm (custom ?Alaskan Arrows? with solid
elements), SSB E. SP-7000 on UHF preamp, 28 meters of ? inch hardline,
bias-T,
Airspy rtl-sdr dongle. Not a superstation by any stretch.
At this point the DSLWP-B is in a lunar orbit. While DSLWP-A has been
reported on S-band, we don?t know its status or location.
See http://destevez.net/2018/06/dslwp-bs-journey-to-the-moon-part-iii/ for
much more detail. This blog reflects a tremendous effort by many experts
including EA4GPZ, BG2BHC and Scott Tilley, among others. (Early this year
Scott discovered that the ?long dead? IMAGE satellite was in fact alive.)
The DSLWP team has now conducted several tests after the lunar injection.
Cees Bassa and Jan PA3FXB have had some amazing results with the Dwingeloo
radio telescope in the Netherlands, during a lunar test window a few days
ago. Alas, we can only dream of such an antenna, and place to put it!
Perhaps more relevant to your question - a very big round of applause for
Piotr SP5ULN who was successful with a decode from the lunar orbit.
Piotyr?s setup is a Cushcraft 719B 19 el Yagi, SSB Electronics LNA
(SP-7000), 30m of RF-10 coax, bias tee and simple RTL-SDR. So, we remain
hopeful? Others may have also been successful, but the DSLWP telemetry
server seems to be down and I can?t tell if there were any other recent
contributors. Perhaps Wei BG2BHC will give us another update and we can
find out what the setup was.
BTW, there is another test and hopefully some of the friends in Japan will
be successful too.
One more point, as far as I am aware only GMSK has been transmitted. But,
there is also a JT4G transmitter on ?B. Hopefully, JT4G will be easier to
receive. I for one hope that will be the case.
73,
Bob
N6RFM
------------------------------
Message: 4
Date: Wed, 6 Jun 2018 21:50:20 -0700
From: "Hugo Dominguez, Jr." <hugois@?????.???>
To: Daniel Wight <kd7lee@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID: <00C95211-D98E-4656-A393-D425DA744CF2@?????.???>
Content-Type: text/plain; charset=utf-8
Thanks. All the web pages I read said to perform doppler shift by starting
10 kHz below and work your way up. Even this amsat website has instructions
to do it how I am doing it:
https://amsat-uk.org/2018/01/26/ao-92-open-for-amateur-radio-use/
I also just noticed that there is a schedule for the L-band for uplink which
i?m interpreting that UHF won?t work when the bird is setup for the L-band
for uplink. Maybe I was trying to make contact when it was on the L band.
?
Hugo Dominguez, Jr.
> On Jun 6, 2018, at 21:07, Daniel Wight <kd7lee@?????.???> wrote:
>
> Seems like your Doppler shift might be opposite. I normally start high &
work my way down during the satellite pass... (For instance, I would start
at 435.180 for AO-85 and then work my way down to 435.160 as the satellite
'sunsets' on my horizon). Doppler shift should be higher frequency during
approach, near zero when the satellite is overhead, and lower after the
satellite passes.
>
> 73,
>
> Daniel, KD7LEE
>
>> On Wed, Jun 6, 2018, 17:27 Andrew Glasbrenner
<glasbrenner@??????????.???> wrote:
>> You've discovered one of the reasons full duplex is best on the FM
sats...you have no idea if you are getting through, because you can't hear
while transmitting.
>>
>> Got another radio so you can work full duplex?
>>
>> 73, Drew KO4MA
>>
>> -----Original Message-----
>> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez,
Jr.
>> Sent: Wednesday, June 06, 2018 7:41 PM
>> To: amsat-bb@?????.???
>> Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
>>
>> I?ve just started playing with talking on satellites. I?m able to hear
all the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed on
my Kenwood TH-D74, which I use with my Elk dual band periodic log antenna.
However no one can hear me or responds to me. I?ve only been successful with
my uplink (being heard) on AO-91 on several passes. I triple checked my
frequencies on my radio and the 67 Hz tone and they are set as follows:
>> Sat. Xmit Tone
>> SO-50 145.850 67.0 Hz
>> AO-85 435.170 67.0 Hz
>> AO-91 435.250 67.0 HZ
>> AO-92 435.350 67.0 Hz
>> These are the frequencies used when the bird is at its peak. I adjust for
doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
435.170, 435.175, 435.180.
>>
>> Any ideas if something has changed from what is published or am I missing
something? Like I said, i?ve been able to communicate on AO-91.
>>
>> ?
>> Hugo Dominguez, Jr.
>> _______________________________________________
>> 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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Thu, 7 Jun 2018 08:41:30 +0100
From: Graham Shirville <g.shirville@??????????.???>
To: AMSAT <amsat-bb@?????.???>
Cc: "ON-editor@?????.???? <ON-editor@?????.???>
Subject: [amsat-bb] Oscar News #220 - Your input will be very welcome
Message-ID: <4b363f88-e639-91dd-1b28-cce6dbce4707@??????????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi All,
The editors of the quarterly OSCAR NEWS magazine are now starting their
hard work to put together the next edition. This will be published?
around the end of this month.
Your news, views and articles for Oscar News are always very welcome.
These really are the most exciting times to be involved win the amateur
satellite world with so many unique new projects underway. The magazine
continues to provide interesting details about these various space
missions and the groundstations needed to communicate with them.
We are able to accept your input in almost any of the usual formats but
please keep the images separate or put them at the end of the document.
Please contact us at ON-editor@?????.???? with your information or if
you have any questions.
thanks and 73
Graham - G3VZV
------------------------------
Message: 6
Date: Thu, 7 Jun 2018 18:52:14 +0800 (CST)
From: ??? <wmc_jx@???.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: [amsat-bb] DSLWP UHF Test Plan 7 Jun & 8 Jun
Message-ID: <28f45c6.bb6b.163d9e020b1.Coremail.wmc_jx@???.???>
Content-Type: text/plain; charset=GBK
Hi OMs,
The subsequent tests for DSLWP UHF are planned from 7 Jun 22:00 UTC to 8 Jun
00:00 UTC, and from 8 Jun 05:45 UTC to 8 Jun 06:45 UTC. The mode is 250 bps
GMSK for both 435.4 MHz and 436.4 MHz.
Tracking file updates can be found on: https://github.com/bg2bhc/dslwp_dev
or http://lilacsat.hit.edu.cn/tle/program_tracking_dslwp-b.txt
Updated version (20180530) of Live CD:
https://drive.google.com/file/d/1Ptga7XfgQ--qsnD4QhpNiRRUIW3c626L/view?usp=sha
ring
VY TN & 73!
Wei BG2BHC
--
WEI Mingchuan
Research Center of Satellite Technology
Harbin Institute of Technology
mobile: +86-189-4501-5242
e-mail: wmc_jx@???.???? bg2bhc@?????.???
------------------------------
Message: 7
Date: Thu, 7 Jun 2018 08:10:21 -0500
From: "Mac A. Cody" <maccody@???.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] AMSAT at Ham-Com, June 8-10, 2018
Message-ID: <79a9b5b2-1c93-f49f-3f3a-8cb4ad6c388f@???.???>
Content-Type: text/plain; charset=utf-8; format=flowed
All,
AMSAT will have a booth at the 2018 Ham-Com in Plano, Texas, June 8 - 10.
The AMSAT booth will be at two tables on the Main Hallway, north of the
Snack Bar and across from the ARRL booth.? There will be two presentations:
one of Friday, June 8, at 2:00 PM and one on Saturday at 11:00 AM.
I will be providing demos on the FM birds using my call sign AE5PH.? Below
is a tentative schedule of the satellite passes I'll be working. I will
not be available Sunday morning, due to other commitments.
?????? DATE? ? Satellite? AOS (UTC)
???? 08 Jun 18 ? AO-91??? 18:05:08
?? ? 08 Jun 18 ? AO-91 ?? 19:41:14
?? ? 08 Jun 18 ? SO-50 ?? 21:03:04
?? ? 09 Jun 18?? AO-85 ?? 13:31:08
? ?? 09 Jun 18 ? AO-85 ?? 15:11:48
? ?? 09 Jun 18 ? AO-92 ?? 16:40:54
? ?? 09 Jun 18 ? AO-91 ?? 18:26:32
? ?? 09 Jun 18 ? AO-91 ?? 20:03:55
? ?? 09 Jun 18 ? SO-50 ?? 21:27:15
? ?? 10 Jun 18 ? AO-91 ?? 18:48:13 (Subject to demand)
I hope to hear you on the satellites this weekend and if you hear me, I'd
appreciate a QSO from you.
73,
Mac Cody / AE5PH
------------------------------
Message: 8
Date: Wed, 6 Jun 2018 23:08:01 -0700
From: Daniel Wight <kd7lee@?????.???>
To: "Hugo Dominguez, Jr." <hugois@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID:
<CADWh2KpF97VQz5kue-NoihL1EUtnO=O8S=9=Q03Vioua9qn5Dg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
As Gabe pointed out, I may have this backwards as I started out on SO-50
(V/U) & then applied my original techniques to the Fox (U/V) birds in error
(i.e. your initial settings are probably correct). I need to do some more
research before I understand this fully, but it looks like I've been using
the wrong uplink frequencies on my IC-W32A. My apologies for the mistake.
Looks like I'll be reprogramming my radio soon....
73,
Daniel, KD7LEE
On Wed, Jun 6, 2018, 21:50 Hugo Dominguez, Jr. <hugois@?????.???> wrote:
> Thanks. All the web pages I read said to perform doppler shift by starting
> 10 kHz below and work your way up. Even this amsat website has instructions
> to do it how I am doing it:
> https://amsat-uk.org/2018/01/26/ao-92-open-for-amateur-radio-use/
>
> I also just noticed that there is a schedule for the L-band for uplink
> which i?m interpreting that UHF won?t work when the bird is setup for the
> L-band for uplink. Maybe I was trying to make contact when it was on the L
> band.
>
> ?
> Hugo Dominguez, Jr.
>
> On Jun 6, 2018, at 21:07, Daniel Wight <kd7lee@?????.???> wrote:
>
> Seems like your Doppler shift might be opposite. I normally start high &
> work my way down during the satellite pass... (For instance, I would start
> at 435.180 for AO-85 and then work my way down to 435.160 as the satellite
> 'sunsets' on my horizon). Doppler shift should be higher frequency during
> approach, near zero when the satellite is overhead, and lower after the
> satellite passes.
>
> 73,
>
> Daniel, KD7LEE
>
> On Wed, Jun 6, 2018, 17:27 Andrew Glasbrenner <glasbrenner@??????????.???>
> wrote:
>
>> You've discovered one of the reasons full duplex is best on the FM
>> sats...you have no idea if you are getting through, because you can't hear
>> while transmitting.
>>
>> Got another radio so you can work full duplex?
>>
>> 73, Drew KO4MA
>>
>> -----Original Message-----
>> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez,
>> Jr.
>> Sent: Wednesday, June 06, 2018 7:41 PM
>> To: amsat-bb@?????.???
>> Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
>>
>> I?ve just started playing with talking on satellites. I?m able to hear
>> all the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed
>> on my Kenwood TH-D74, which I use with my Elk dual band periodic log
>> antenna. However no one can hear me or responds to me. I?ve only been
>> successful with my uplink (being heard) on AO-91 on several passes. I
>> triple checked my frequencies on my radio and the 67 Hz tone and they are
>> set as follows:
>> Sat. Xmit Tone
>> SO-50 145.850 67.0 Hz
>> AO-85 435.170 67.0 Hz
>> AO-91 435.250 67.0 HZ
>> AO-92 435.350 67.0 Hz
>> These are the frequencies used when the bird is at its peak. I adjust for
>> doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
>> 435.170, 435.175, 435.180.
>>
>> Any ideas if something has changed from what is published or am I missing
>> something? Like I said, i?ve been able to communicate on AO-91.
>>
>> ?
>> Hugo Dominguez, Jr.
>> _______________________________________________
>> 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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
>>
>
------------------------------
Message: 9
Date: Thu, 7 Jun 2018 07:27:24 +0100
From: <k5oe@???.???>
To: <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID: <03ad01d3fe28$99882620$cc987260$@???.???>
Content-Type: text/plain; charset="utf-8"
Daniel, et al,
There might be a bit of confusion about the references used in various
posts: note below where one talks about transmit frequency and another
talks about receive frequency. The behavior of any satellite's radio
signals is always the same, regardless of which band is uplinked and which
band is downlinked. To (hopefully) clarify this topic, please note:
- Receive frequency is higher at AOS (satellite is approaching you) and
drifts lower towards LOS (going away from you)
- Transmit frequency must be tuned lower at AOS and is adjusted/tuned higher
towards LOS (to match satellite's receiver)
The receive tuning is fairly apparent as you can hear the satellite, but the
amount of transmit "adjustment" isn't, especially if you don't have a full
duplex radio (as Drew suggests, may be a good investment in stress
reduction). The various tables published for the satellites list suggested
frequencies, and these are handy if you are adept at changing memories
quickly. If you want to (or have to) do it manually, you could use this as
a guide: UHF +/- 10 kHz and VHF +/- 3 kHz for a full/high pass of near 90
degrees elevation (at a TCA of only 45 degrees, use half of those shift
frequencies... start in the middle of your memory set). Many suggest
leaving the VHF uplink at a center frequency: that is convenient but my
experience is your signal is not nearly as likely to be successful in a
crowded pass (the satellite receiver picks the biggest dog in the pack to
repeat).
If you are chasing grids, try very low passes (less than 20 degrees at TCA),
use a high gain directional antenna or stand directly in front of your car
as a useful reflector (truck beds especially good for this), and just tune
the center of the band for both T & R.
73,
Jerry, K5OE/G
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez, Jr.
Sent: Thursday, June 7, 2018 5:50 AM
To: Daniel Wight <kd7lee@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Thanks. All the web pages I read said to perform doppler shift by starting
10 kHz below and work your way up. Even this amsat website has instructions
to do it how I am doing it:
https://amsat-uk.org/2018/01/26/ao-92-open-for-amateur-radio-use/
I also just noticed that there is a schedule for the L-band for uplink which
i?m interpreting that UHF won?t work when the bird is setup for the L-band
for uplink. Maybe I was trying to make contact when it was on the L band.
?
Hugo Dominguez, Jr.
> On Jun 6, 2018, at 21:07, Daniel Wight <kd7lee@?????.???> wrote:
>
> Seems like your Doppler shift might be opposite. I normally start high &
work my way down during the satellite pass... (For instance, I would start
at 435.180 for AO-85 and then work my way down to 435.160 as the satellite
'sunsets' on my horizon). Doppler shift should be higher frequency during
approach, near zero when the satellite is overhead, and lower after the
satellite passes.
>
> 73,
>
> Daniel, KD7LEE
>
>> On Wed, Jun 6, 2018, 17:27 Andrew Glasbrenner
<glasbrenner@??????????.???> wrote:
>> You've discovered one of the reasons full duplex is best on the FM
sats...you have no idea if you are getting through, because you can't hear
while transmitting.
>>
>> Got another radio so you can work full duplex?
>>
>> 73, Drew KO4MA
>>
>> -----Original Message-----
>> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez,
Jr.
>> Sent: Wednesday, June 06, 2018 7:41 PM
>> To: amsat-bb@?????.???
>> Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
>>
>> I?ve just started playing with talking on satellites. I?m able to hear
all the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed on
my Kenwood TH-D74, which I use with my Elk dual band periodic log antenna.
However no one can hear me or responds to me. I?ve only been successful with
my uplink (being heard) on AO-91 on several passes. I triple checked my
frequencies on my radio and the 67 Hz tone and they are set as follows:
>> Sat. Xmit Tone
>> SO-50 145.850 67.0 Hz
>> AO-85 435.170 67.0 Hz
>> AO-91 435.250 67.0 HZ
>> AO-92 435.350 67.0 Hz
>> These are the frequencies used when the bird is at its peak. I adjust for
doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
435.170, 435.175, 435.180.
>>
>> Any ideas if something has changed from what is published or am I missing
something? Like I said, i?ve been able to communicate on AO-91.
>>
>> ?
>> Hugo Dominguez, Jr.
>> _______________________________________________
>> 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: http://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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 10
Date: Thu, 7 Jun 2018 07:28:45 +0000 (UTC)
From: "k6vug@?????????.???? <k6vug@?????????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID: <1272641698.30302.1528356525793@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Drew KO4MA, is absolutely right, operating full duplex is the best way to
work these satellites.
Having said that, I was stumped once when I heard the AO-92 downlink "full
quieting" for the entire pass but could not get into the uplink. Strangely
enough, I heard only 2 stations calling and no one responding.
It was pretty frustrating, making me doubt everything I had learned so far.?
Then one day, I found out (right here on this BBS) that the satellite
switches to L/V mode, then it all made sense. Now I always check the current
status page at AMSAT.ORG especially when operating AO-92.?
I also learned about why it difficult to get into AO-85 with a HT.? Keep
reading, you'll learn a lot here from the gurus... trust me :)??
Good luck on the next pass...?
73!Umeshk6vug
------------------------------
Message: 12
Date: Wed, 6 Jun 2018 20:25:49 -0400
From: "Andrew Glasbrenner" <glasbrenner@??????????.???>
To: "'Hugo Dominguez, Jr.'" <hugois@?????.???>,??? <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
Message-ID: <002c01d3fdf6$16120c20$42362460$@??????????.???>
Content-Type: text/plain;??? charset="UTF-8"
You've discovered one of the reasons full duplex is best on the FM
sats...you have no idea if you are getting through, because you can't hear
while transmitting.
Got another radio so you can work full duplex?
73, Drew KO4MA
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hugo Dominguez, Jr.
Sent: Wednesday, June 06, 2018 7:41 PM
To: amsat-bb@?????.???
Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
I?ve just started playing with talking on satellites. I?m able to hear all
the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed on my
Kenwood TH-D74, which I use with my Elk dual band periodic log antenna.
However no one can hear me or responds to me. I?ve only been successful with
my uplink (being heard) on AO-91 on several passes. I triple checked my
frequencies on my radio and the 67 Hz tone and they are set as follows:
Sat.? ? ? ? Xmit? ? ? Tone
SO-50? 145.850? 67.0 Hz
AO-85? 435.170? 67.0 Hz
AO-91? 435.250? 67.0 HZ
AO-92? 435.350? 67.0 Hz
These are the frequencies used when the bird is at its peak. I adjust for
doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
435.170, 435.175, 435.180.
Any ideas if something has changed from what is published or am I missing
something? Like I said, i?ve been able to communicate on AO-91.
?
Hugo Dominguez, Jr.
------------------------------
------------------------------
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!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 13, Issue 195
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