ARISSAT-1 TLM Problem

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Has the ARISSat-1 CW-2 frequency...

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Re: Seeking Sat Presentation

Randy

29 Aug 2011 29 Aug '11

1:38 p.m.

Hi all ..

I am receiving the CW and TLM ok signal wise ..

I tune in the CW to the mark in the CW / BPSK window..

But I don't ever receive any telemetry ..

Using USB, FT897D ..

I use the rig and computer for BPSK31 all the time ..

Any ideas or suggestions ?? I even watched the You tube

Video that was posted ..

It seems like I am doing it correctly .. but must be missing something ..

Thanks..

Randy - N2CUA

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Mark L. Hammond

29 Aug 29 Aug

2 p.m.

New subject: [amsat-bb] Re: ARISSAT-1 TLM Problem

Hi Randy,

Some people have reported that some types of "soundcard interfaces" don't work with this telemetry format. Some reports are even from reliable sources ;)

All kidding aside---where are you getting audio out of the radio; what is the path to the sound card (straight wire? some type of interface, either homebrew or assembled?); and what sound card input are you using?

This is a case of "simple is better."

Mark N8MH

On Mon, Aug 29, 2011 at 1:38 PM, Randy [email protected] wrote:

...

Hi all ..

I am receiving the CW and TLM ok signal wise ..

I tune in the CW to the mark in the CW / BPSK window..

But I don't ever receive any telemetry ..

Using USB, FT897D ..

I use the rig and computer for BPSK31 all the time ..

Any ideas or suggestions ?? I even watched the You tube

Video that was posted ..

It seems like I am doing it correctly .. but must be missing something ..

Thanks..

Randy - N2CUA

Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

-- Mark L. Hammond [N8MH]

James McBride

30 Aug 30 Aug

9:54 a.m.

New subject: [amsat-bb] Re: ARISSAT-1 TLM Problem

Randy, Make sure you have any audio or DSP filters switched off, IF shift to centre etc. I found the 'tone' control on the FT736 affects the decode (eventually, by accident).. Also I found that I had a dirty contact on the soundcard input to my PC's motherboard! After I fixed some of these things, the decode was okay, mind you I suspect shielded cable would also be better - I'm using twin speaker lead.. :( . Put the CW at the marker (as close as possible and adjust for doppler) in USB mode and you should get some good frames eventually. I've found usually the high elevation passes are reliable, the low ones at 3-5 degrees just don't give me enough of a chance to get telemetry sometimes.

The soundcard is usually part of the issue also. My old P-4 shuttle mainboard AC97 codec style soundcard I think only samples at 48KHz or something and uses software drivers to pretend the sampling is at other rates - a proper PCI soundblaster style card or high quality SDR style soundcard would probably work better. At some stage I might try a better PC but for now it works some of the time straight from the headphone socket to line-in on the soundcard.

73 James VK6FJA

On 30/08/2011 2:00 AM, Mark L. Hammond wrote:

...

Hi Randy,

Some people have reported that some types of "soundcard interfaces" don't work with this telemetry format. Some reports are even from reliable sources ;)

All kidding aside---where are you getting audio out of the radio; what is the path to the sound card (straight wire? some type of interface, either homebrew or assembled?); and what sound card input are you using?

This is a case of "simple is better."

Mark N8MH

On Mon, Aug 29, 2011 at 1:38 PM, Randy[email protected] wrote:

...
Hi all ..

I am receiving the CW and TLM ok signal wise ..

I tune in the CW to the mark in the CW / BPSK window..

But I don't ever receive any telemetry ..

Using USB, FT897D ..

I use the rig and computer for BPSK31 all the time ..

Any ideas or suggestions ?? I even watched the You tube

Video that was posted ..

It seems like I am doing it correctly .. but must be missing something ..

Thanks..

Randy - N2CUA

Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

Douglas Quagliana

31 Aug 31 Aug

8:12 p.m.

New subject: [amsat-bb] Re: ARISSAT-1 TLM Problem

All, ARISSatTLM only uses the 48 kHz sampling rate on soundcards, so that's the only rate your card needs to be able to run at for ARISSatTLM. Douglas KA2UPW/5

James McBride wrote:

...

Randy, Make sure you have any audio or DSP filters switched off, IF shift to centre etc. I found the 'tone' control on the FT736 affects the decode (eventually, by accident).. Also I found that I had a dirty contact on the soundcard input to my PC's motherboard! After I fixed some of these things, the decode was okay, mind you I suspect shielded cable would also be better - I'm using twin speaker lead.. :( . Put the CW at the marker (as close as possible and adjust for doppler) in USB mode and you should get some good frames eventually. I've found usually the high elevation passes are reliable, the low ones at 3-5 degrees just don't give me enough of a chance to get telemetry sometimes.

The soundcard is usually part of the issue also. My old P-4 shuttle mainboard AC97 codec style soundcard I think only samples at 48KHz or something and uses software drivers to pretend the sampling is at other rates - a proper PCI soundblaster style card or high quality SDR style soundcard would probably work better. At some stage I might try a better PC but for now it works some of the time straight from the headphone socket to line-in on the soundcard.

73 James VK6FJA

Dee

29 Aug 29 Aug

3:23 p.m.

New subject: [amsat-bb] Re: ARISSAT-1 TLM Problem

Randy, I am also posting this to the BB for information to all... I recently worked with another ham having the same problem. He had a computer that was a few years old. I told him that he could need a soundcard update. After he switched his card, the program started functioning. Go to your setup for your soundcard and see that it is set up for the maximum response scenario. Good luck and several people have upgraded their card and software functioned for them. 73, Dee, NB2F

-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Randy Sent: Monday, August 29, 2011 1:39 PM To: [email protected] Subject: [amsat-bb] ARISSAT-1 TLM Problem

Hi all ..

I am receiving the CW and TLM ok signal wise ..

I tune in the CW to the mark in the CW / BPSK window..

But I don't ever receive any telemetry ..

Using USB, FT897D ..

I use the rig and computer for BPSK31 all the time ..

Any ideas or suggestions ?? I even watched the You tube

Video that was posted ..

It seems like I am doing it correctly .. but must be missing something ..

Thanks..

Randy - N2CUA

_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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Dee
Douglas Quagliana
James McBride
Mark L. Hammond
Randy