Date   

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 .


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





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 ...


 


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 ...

 

Http://www.work-sat.com

 

Clint


Virus-free. www.avast.com


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


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!


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


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.

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


ISS SSTV Project

Clint Bradford
 


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!


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



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


Re: Another software solution

pg321@...
 

AO-91 aka FOX1b screenshot in Stellarium doing a pass .


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


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]:

 

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



Re: AO-91 - Fox-1B Successfully Deployed

Phillip Lontz <philji@...>
 

So very cool!


On Nov 18, 2017, at 11:41 AM, clintbradford@... [Work-Sat] <Work-Sat@...> wrote:

 

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


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/


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


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/





Re: JPSS-1 Launch Update

Clint Bradford
 

Saturday !!! Again at 1:47am Pacific ...

http://spaceflight101.com/events/delta-ii-jpss-1/

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