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Re: Why Doppler Correction when there's AFC?
pg321@...
Hi Clint , you could be talking about 2 different things there ?
1- is the deviation definition , is that FM "voice bandwidth" deviation and not frequency deviation (the carrier) . 2- AFC which is a good idea , as i never had thought about that at all , similar to a synchronous detector in a AM shortwave radio , i can say if implemented correctly AM sync sure does work , reliably up to 10Khz away from the carrier +/- . Paul . ps- yet to try to key up 91 , so far the passes have been noise-y , not sure if its power-line noise on that frequency or a weaker signal yet .
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Why Doppler Correction when there's AFC?
Clint Bradford
An interesting inquiry: AO-91 has Automatic Frequency Control built into it. So why is it recommended to adjust the Uplink frequency for Doppler? Lab testing of '91 "corrected" to +/- 8.5kHz deviation in the uplink. Hmmm ... Keep working it, and document your signal reports! Clint
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Re: AO-91 Fully Commissioned
Clint Bradford
Typo corrected - thanks!
N8HM reports: It (AO-91) needs 2 seconds of TX with a 67 Hz tone to activate the transponder. After that, it’ll turn off after not hearing the tone for a minute. If everyone uses a 67 Hz tone, it’ll just stay on ...
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Re: AO-91 Fully Commissioned
Fred Hillhouse
Hi Clint,
Happy Thanksgiving!
Just a heads up: your PDF with frequencies has the wrong ‘Alpha’ for AO-91.
Is there a required kick start for AO-91 like on SO-50? I thought I read there was one.
Thanks!
Best regards, Fred N7FMH
From: Work-Sat@... [mailto:Work-Sat@...]
Sent: Thursday, November 23, 2017 9:51 AM To: Work-Sat@... Subject: [Work-Sat] AO-91 Fully Commissioned
Fully commissioned today!
https://m.facebook.com/story.php?story_fbid=1599152743461102&id=208113275898396
Frequency chart for the FM voice transponder posted at ...
Clint
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AO-91 Fully Commissioned
Clint Bradford
Fully commissioned today! https://m.facebook.com/story.php?story_fbid=1599152743461102&id=208113275898396 Frequency chart for the FM voice transponder posted at ... Http://www.work-sat.com Clint
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Re: Do NOT Use Trasponder on AO-91
Max White
EA stations heard working it over europe pass as i type....some people...
From: Work-Sat@... on behalf of clintbradford@... [Work-Sat]
Sent: 23 November 2017 05:10 To: Work-Sat@... Subject: [Work-Sat] Re: Do NOT Use Trasponder on AO-91 FROM THE CONTROL TEAM TODAY: AO-91 transponder is on to produce telemetry with all systems active, while we examine unexpected maximum values we see.
Transponder is on but not open, please respect our request to keep clear.
Copy TLM to help.
05:15 11/23 pass we will command so please keep uplink clear.
TNX!
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Re: Do NOT Use Trasponder on AO-91
pg321@...
So what are the unexpected values referenced to?
These? below (mA) 1.0 0.7 768.6 , the last set of 768mA , doing nothing ie:inactive ?. i got the info/data from here http://www.amsat.org/tlm/health.php?id=2&port= Paul
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Re: AO-91's Voice DownlInk Is ...
Max White
Indeed, on a colinear it is been picked up fully readable at 2.8 deg elevation at 3000km range...de Max/M0VNG
From: Work-Sat@... on behalf of clintbradford@... [Work-Sat]
Sent: 21 November 2017 21:27 To: Work-Sat@... Subject: [Work-Sat] AO-91's Voice DownlInk Is ... Spectacular.
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ISS SSTV Project
Clint Bradford
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Re: Do NOT Use Trasponder on AO-91
Clint Bradford
FROM THE CONTROL TEAM TODAY:
AO-91 transponder is on to produce telemetry with all systems active, while we examine unexpected maximum values we see.
Transponder is on but not open, please respect our request to keep clear.
Copy TLM to help.
05:15 11/23 pass we will command so please keep uplink clear.
TNX!
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Do NOT Use Trasponder on AO-91
Clint Bradford
Tentatively ... DO NOT USE THE FM REPEATER YET ... I was saddened to hear some West Coast hams using the FM voice transponder today ... Improper protocol ("CQ CQ ... ") - but the bird has NOT officially been commissioned for transponder use yet. Responsible hams are awaiting official "GO!" announcement for the control team. Clint
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AO-91's Voice DownlInk Is ...
Clint Bradford
Spectacular.
I have heard the pre-recorded female voice the past two days ... full-quieting on a non-sat setup: just a modest mobile antenna on my car while commuting. Clint
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Re: Another software solution
pg321@...
AO-91 aka FOX1b screenshot in Stellarium doing a pass .
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Re: AO-91 - Fox-1B Successfully Deployed
pg321@...
Look at that , both Fox's ,1 heading north the other heading south .
1 457.5 klm high the other 603.7 klm . Paul
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Re: AO-91 - Fox-1B Successfully Deployed
Siegfried Jackstien
hello clint ... hopefully we can try it soon :) dg9bfc sigi Am 18.11.2017 um 18:41 schrieb
clintbradford@... [Work-Sat]:
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Re: AO-91 - Fox-1B Successfully Deployed
Phillip Lontz <philji@...>
So very cool!
toggle quoted messageShow quoted text
On Nov 18, 2017, at 11:41 AM, clintbradford@... [Work-Sat] <Work-Sat@...> wrote:
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Re: AO-91 - Fox-1B Successfully Deployed
Clint Bradford
From N8HM -
Celestrak now has four objects from today's launch in their catalog. 2017-073C (Object 43015) tracked Doppler perfectly during the last pass over North America, but the identification of the various objects is subject to change as they separate. 2017-073C 1 43015U 17073C 17322.62015174 -.00000076 00000-0 00000+0 0 9995 2 43015 97.6873 257.7630 0258702 236.7177 305.5679 14.77570475 37 https://celestrak.com/NORAD/elements/tle-new.txt /end/
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Re: AO-91 - Fox-1B Successfully Deployed
Clint Bradford
Tentatively ... DO NOT USE THE FM REPEATER YET ...
Memory 1 (AOS) – Transmit 435.240 MHz (67.0 Hz Tone), Receive 145.960 MHz Memory 2 (Approaching) – Transmit 435.245 MHz (67.0 Hz Tone), Receive 145.960 MHz Memory 3 (TCA) – Transmit 435.250 MHz (67.0 Hz Tone), Receive 145.960 MHz Memory 4 (Departing) – Transmit 435.255 MHz (67.0 Hz Tone), Receive 145.960 MHz Memory 5 (LOS) – Transmit 435.260 MHz (67.0 Hz Tone), Receive 145.960 MHz
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AO-91 - Fox-1B Successfully Deployed
Clint Bradford
AO-91 was successfully deployed this morning - but DO NOT key up on its FM Voice uplink frequency yet! It is emitting expected telemetry - and teams are working on getting it "tuned up" for use as out newest FM Voice bird SOON! Even if you do hear voice traffic, WAIT until you read an AMSAT-NA citation / post stating it is up and available. More info - and how to receive and decode and assist the ground during this period at ... https://amsat-uk.org/2017/11/04/getting-ready-for-radfxsat-fox-1b/
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Re: JPSS-1 Launch Update
Clint Bradford
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