Date   
Re: Quetzal-1 - Argentina

Clint Bradford
 

QUETZAL-1
1 99836U 98067RJ  20119.17395362  .00001998  00000-0  43915-4 0  9997
2 99836  51.6451 236.0002 0001478 199.2001 225.5884 15.49326450224263


-from  Universidad del Valle de Guatemala 

Re: AO-92 camera mode

 

The data is sent as a series of packets using FSK modulation over the FM downlink. There is normally always something being sent as long as the repeater is being kept active, but it is usually sent as slow-speed 200 bps Data-Under-Voice (DUV) in the sub-200 Hz audio range and will be filtered out by most FM receivers as it is in the same range as PL tones. You generally won't hear it in this case. The recent camera experiment is using the High-Speed mode sending at 9600 bps and can clearly be heard over the voice channel even with a regular FM receiver (though some of the important content may still be filtered out). If you are using an SDR receiver to capture the signal, make sure any audio filtering and squelch is turned off during the pass. The audio from either mode can be fed into Foxtelem to decode the satellite telemetry and, if you enable it, can be uploaded to AMSAT servers and attributed to your callsign as helping the greater good.

- Loren
K7IW


On Tue, Apr 28, 2020 at 10:04 PM Rob Ramsey <ramsey4@...> wrote:

A little more info please on the camera mode of AO-92 , Is this just a real time transmission as the satellite is overhead or close by? is it stored and sent continuously for a predetermined time? I had my station on remote all day got nothing here in New Zealand ZL3TCM

Re: AO-92 camera mode

Clint Bradford
 

It is “near live” - and you’ll probably just receive portions of a photo ...

AO-92 camera mode

Rob Ramsey
 

A little more info please on the camera mode of AO-92 , Is this just a real time transmission as the satellite is overhead or close by? is it stored and sent continuously for a predetermined time? I had my station on remote all day got nothing here in New Zealand ZL3TCM

Re: Quetzal-1 - Argentina

Clint Bradford
 

QUETZAL-1
1 99990U 98067A   20119.56587424  .00001440  00000-0  33911-4 0  9990
2 99999  51.6450 234.0607 0001480 200.5697 251.6220 15.49325980224329


Plugging this in to GPredict ...

Re: Quetzal-1 - Argentina

 

I wish that would have occurred to me before I missed the last good pass for today. However, someone did post that it's in the AMSAT Argentine TLEs:


- Loren
K7IW

On Tue, Apr 28, 2020, 16:29 Clint Bradford via groups.io <clintbradford=mac.com@groups.io> wrote:
Just using the ISS’ TLE for a day or so ...

Re: Quetzal-1 - Argentina

Clint Bradford
 

Just using the ISS’ TLE for a day or so ...

Re: Quetzal-1 - Argentina

 

Where are the current TLEs for this satellite being published? I haven't found them yet.

- Loren
K7IW

Re: Quetzal-1 - Argentina

Jer W
 

Thank you so much Cliff.
I  just need a little time to get back my strength and hope to be back on
sometime in May. That is so kind of you to think of me. Thank you.
Yes would like to join some of you guys on the west coast.
Be safe and don't forget the masks.

You can also use my ham e-mail :   w8rqm@....

Have a great and safe day.

Jerry...W8RQM




On Tuesday, April 28, 2020, 4:31:56 PM EDT, Clint Bradford via groups.io <clintbradford@...> wrote:


Jerry - If you ever want to call ... of we can set up a Zoom conference ... let me know.

We'll gather a couple of hams and just chat.

Clint
951-533-4984 - cell

Re: Quetzal-1 - Argentina

Clint Bradford
 

Jerry - If you ever want to call ... of we can set up a Zoom conference ... let me know.

We'll gather a couple of hams and just chat.

Clint
951-533-4984 - cell

Re: Quetzal-1 - Argentina

Jer W
 

Cliff,
Its a bad virus going around as everyone knows. Taking massive amounts of meds for the last couple of days. It helped to break this painful fever.
Now the recovery time starts to heal the bones and muscle tissue. Doc said it will just take time. Thanks for letting me answer you on the Work-Sat board.
I'm trying to get on the SATS shortly, hopefully sometime in the month of May and enjoy those memorable contacts with al of you.
Thanks,
Jerry...W8RQM




On Tuesday, April 28, 2020, 4:09:54 PM EDT, Clint Bradford via groups.io <clintbradford@...> wrote:


>> ... Cliff ...

I'll answer for him.

>> ... Any  videos that show the launch from the space craft?

Check out their Web site for the YouTube link. Quite a production, with 
many politicians and folks offering praise and congratulations!

The commissioning was simple: 




>> ... Just left the hospital yesterday from this bad virus and the pain prior to that was terrible. Doc said its going to take me at 6 or more months to recover ...

Oh my ... Please take care of yourself. Why the "six months" to recover? 

Clint
 

Re: Quetzal-1 - Argentina

Clint Bradford
 

>> ... Cliff ...

I'll answer for him.

>> ... Any  videos that show the launch from the space craft?

Check out their Web site for the YouTube link. Quite a production, with 
many politicians and folks offering praise and congratulations!

The commissioning was simple: 




>> ... Just left the hospital yesterday from this bad virus and the pain prior to that was terrible. Doc said its going to take me at 6 or more months to recover ...

Oh my ... Please take care of yourself. Why the "six months" to recover? 

Clint
 

Re: Quetzal-1 - Argentina

Jer W
 

Cliff,
Any  videos that show the launch from the space craft?

Jerry..W8RQM

P.S.: Just left the hospital yesterday from this bad virus and the pain prior to that was terrible. Doc said its going to take me at 6 or more months to recover.






On Tuesday, April 28, 2020, 3:41:40 PM EDT, Clint Bradford via groups.io <clintbradford@...> wrote:


And she's up and running!!!

https://www.qsl.net/py4zbz/quetzal.htm

Re: AO-92 to Camera Mode

Clint Bradford
 

Images received this round ...

https://www.amsat.org/tlm/showImages.php?id=4

Re: Quetzal-1 - Argentina

Clint Bradford
 

And she's up and running!!!

https://www.qsl.net/py4zbz/quetzal.htm

Quetzal-1 - Argentina

Clint Bradford
 

Quetzal-1 was just deployed from the Kibo module of the International Space Station.

About 30 minutes after ejection, it should deploy its antennas and begin beacon transmission.

For downlink, Quetzal-1 uses a GOMSpace AX100 transceiver, which will transmit GMSK-modulated data at 4800 bps at 437.200 MHz (as coordinated by IARU).

The spacecraft’s beacon will be sent with a 10 second period. 

This GitHub repository details both the HDLC + AX.25 structure and the beacon data format. You can send all received data to the following email: satelite@....

TLEs will be published as they become available upon deployment from ISS.

Re: AO-92 to Camera Mode

Clint Bradford
 

I have been partial to NooElec products (great, informative Web site, lots of support).

https://www.nooelec.com/store/

Loren - Which Amazon product/vendor have you had good luck with?

Clint




On Mon, Apr 27, 2020 at 01:16 PM, Loren Lang wrote:
Your best bet is to use some kind of SDR. I've used the cheap RTL SDR dongles that can be purchased from Amazon ...

Re: AO-92 to Camera Mode

Clint Bradford
 

I have been partial to NooElec products (great, informative Web site, lots of support).

https://www.nooelec.com/store/

Loren - Which Amazon product/vendor have you had good luck with?

Clint




On Mon, Apr 27, 2020 at 01:16 PM, Loren Lang wrote:
Your best bet is to use some kind of SDR. I've used the cheap RTL SDR dongles that can be purchased from Amazon ...

Re: AO-92 to Camera Mode

 

This is a digital signal and not the same as SSTV that can just be done over a regular, FM receiver. The signal is sent over FM, but it utilizes the full audio spectrum including frequencies below 200 Hz that are often filtered out of the audio. You likely will be missing some of the signal if you try to capture it over a standard FM receiver. Your best bet is to use some kind of SDR. I've used the cheap RTL SDR dongles that can be purchased from Amazon for about $20 with great success. You can use a regular computer or an Android device with appropriate USB On-The-Go cable adapter to connect to the SDR. iPhone can't be use because iOS does not allow sufficient access to the USB hardware to use such a device.

To decode the pictures and upload them, you will need to set up the free Foxtelem program from AMSAT. You can either record the data with your SDR and software like SDR Sharp or SDRTouch during the pass and play back later or live stream the unfiltered audio out to Foxtelem during the pass.

Note, AO-91 and AO-92 both are always transmitting a low-bitrate DUV signal using this same technique along with the regular FM audio so you can test this out during any pass. What's unique tomorrow is that they are turning on the camera and sending high-resolution pictures down using the full audio channel for data instead of voice. The low-bitrate Digital-Under-Voice signal only sends back lower-resolution sensor telemetry, but it's still fun to pick up.

-Loren
K7IW


On Mon, Apr 27, 2020 at 6:45 AM Brad Smith via groups.io <corlissbs=aol.com@groups.io> wrote:
I guess I am a little confused. Can one receive the pics with an iPhone and a radio, like the SSTV images from the ROISS, or does one need a permanent station with a computer? 

Brad KC9UQR

Sent from Brad’s iPad

On Apr 26, 2020, at 12:15 PM, Clint Bradford via groups.io <clintbradford=mac.com@groups.io> wrote:

From AMSAT-NA ...

The command team has had a few requests for camera mode on AO-92 over the
last few weeks, and it's been a while, so let's take some pictures next
week.


Next Tuesday morning, April 28th, we'll attempt to command the camera on at
approximately 1440Z and 1612Z. We'll also try the 1750Z pass. If we can't
command on the 1750Z pass, we'll find a suitable pass later in the week for
the west coast.



Take a look at
https://www.amsat.org/foxtelem-software-for-windows-mac-linux/ for a guide
on how to set up FoxTelem, and https://www.amsat.org/tlm/showImages.php?id=4
for near-live images as we go. Remember, the more stations submitting
telemetry during the event, the better the chance of complete images!



73, Drew KO4MA
AMSAT VP Operations

Re: AO-92 to Camera Mode

Clint Bradford
 

From https://www.amsat.org/foxtelem-software-for-windows-mac-linux/  ---

Fox-1 satellites include two telemetry formats:

  • Slow Speed, also called Data Under Voice (DUV) is 200 bps FSK data sent at the same time as the transponder audio. Whenever the transmitter is on, data is being sent. This happens during beacons and during live QSOs.
  • High Speed is 9600 bps FSK sent instead of the transponder. This is used for data intensive experiments such as the Virginia Tech Camera and the University of Iowa HERCI experiment. This is only active when commanded from the ground. You can recognize High Speed because it sounds like an old school computer modem.
  • FoxTelem will receive and store both formats assuming you can feed it audio that does not have the frequencies below 200 Hz filtered.  For High Speed, the audio must also extend to include the full 9600bps bandwidth of the FM signal.  For both modes this is best achieved from a Software Defined Radio or from the 9600 bps packet port of some radios.  See the user guide for more details.