Foxtelem and Kenwood TM-V71 signal to noise ratio
I made a cable to tap the 9600 data pin off my Kenwood and I'm trying to decode telemetry from AO-91.
I am having trouble getting a continuously clean reception, so I don't expect frames, which I'm not getting, but parts of the reception are fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am wondering if there is still some filtering going on. I notice the peaks of the "bits" are not flat like they are supposed to be according to the manual:
I am recording the audio off the radio into a Zoom H1 at 48,000 KHz 16bit wav.
Maybe I should try hooking the radio directly up to a computer into FoxTelem.
Here is my recording:
https://www.dropbox.com/s/ineqhoprz50ljl3/2017-11-19_-_1743_UTC_-_AO-91_-_FM...
Ideas?
73, John Brier KG4AKV
Seems likely that some sort of audio filtering is going on in your recorder.
73,
Paul, N8HM
On Sun, Nov 19, 2017 at 2:07 PM, John Brier johnbrier@gmail.com wrote:
I made a cable to tap the 9600 data pin off my Kenwood and I'm trying to decode telemetry from AO-91.
I am having trouble getting a continuously clean reception, so I don't expect frames, which I'm not getting, but parts of the reception are fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am wondering if there is still some filtering going on. I notice the peaks of the "bits" are not flat like they are supposed to be according to the manual:
I am recording the audio off the radio into a Zoom H1 at 48,000 KHz 16bit wav.
Maybe I should try hooking the radio directly up to a computer into FoxTelem.
Here is my recording:
https://www.dropbox.com/s/ineqhoprz50ljl3/2017-11-19_-_1743_UTC_-_AO-91_-_FM...
Ideas?
73, John Brier KG4AKV _______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Oh interesting. I didn't consider that. I will see if I can hook the radio into my laptop directly, or try another recorder, though my other recorder does 44.1 KHz only, not 48 KHz like the manual says is ideal.
Thanks Paul.
73, John Brier KG4AKV
On Sun, Nov 19, 2017 at 2:11 PM, Paul Stoetzer n8hm@arrl.net wrote:
Seems likely that some sort of audio filtering is going on in your recorder.
73,
Paul, N8HM
On Sun, Nov 19, 2017 at 2:07 PM, John Brier johnbrier@gmail.com wrote:
I made a cable to tap the 9600 data pin off my Kenwood and I'm trying to decode telemetry from AO-91.
I am having trouble getting a continuously clean reception, so I don't expect frames, which I'm not getting, but parts of the reception are fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am wondering if there is still some filtering going on. I notice the peaks of the "bits" are not flat like they are supposed to be according to the manual:
I am recording the audio off the radio into a Zoom H1 at 48,000 KHz 16bit wav.
Maybe I should try hooking the radio directly up to a computer into FoxTelem.
Here is my recording:
https://www.dropbox.com/s/ineqhoprz50ljl3/2017-11-19_-_1743_UTC_-_AO-91_-_FM...
Ideas?
73, John Brier KG4AKV _______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Hi John.
No decodes here from your audio recording, either. And the reception was crystal clear.
Did set the data speed menu option to 9600? I don't know if the 1200 setting would work with AO-91's DUV data or not; I use an SDR, so my RX audio is already "in" the computer and connected to FoxTelem via VB Audio cable.
Also, I have been using the following USB audio adapter for data audio in/out with success in case you need a device for your computer that can accomodate "line" level audio input:
https://www.amazon.com/Griffin-Technology-iMic-original-Adapter/dp/B003Y5D77...
73!
-Scott, K4KDR
===============================
On Sun, Nov 19, 2017 at 2:16 PM, John Brier johnbrier@gmail.com wrote:
Oh interesting. I didn't consider that. I will see if I can hook the radio into my laptop directly, or try another recorder, though my other recorder does 44.1 KHz only, not 48 KHz like the manual says is ideal.
Thanks Paul.
73, John Brier KG4AKV
On Sun, Nov 19, 2017 at 2:11 PM, Paul Stoetzer n8hm@arrl.net wrote:
Seems likely that some sort of audio filtering is going on in your
recorder.
73,
Paul, N8HM
On Sun, Nov 19, 2017 at 2:07 PM, John Brier johnbrier@gmail.com wrote:
I made a cable to tap the 9600 data pin off my Kenwood and I'm trying to decode telemetry from AO-91.
I am having trouble getting a continuously clean reception, so I don't expect frames, which I'm not getting, but parts of the reception are fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am wondering if there is still some filtering going on. I notice the peaks of the "bits" are not flat like they are supposed to be according to the manual:
I am recording the audio off the radio into a Zoom H1 at 48,000 KHz
16bit wav.
Maybe I should try hooking the radio directly up to a computer into
FoxTelem.
Here is my recording:
1743_UTC_-_AO-91_-_FM05_-_KG4AKV_just_transmissions.wav?dl=0
Ideas?
73, John Brier KG4AKV
Thanks for trying Scott.
I do have the 9600 setting enabled. I think you can also set which side of the radio is used for data, and I believe I set it right, but I'm going to double check.
Thanks for the USB sound card link. I actually have a 10 yr old laptop with mic/line in that I might try. If I have to use a laptop during the pass I almost feel like I might as well just go SDR. In general I don't like to have things anchored to the ground and me, which is why I carry all my gear on my body.
73, John Brier KG4AKV
On Nov 19, 2017 2:31 PM, "Scott" scott23192@gmail.com wrote:
Hi John.
No decodes here from your audio recording, either. And the reception was crystal clear.
Did set the data speed menu option to 9600? I don't know if the 1200 setting would work with AO-91's DUV data or not; I use an SDR, so my RX audio is already "in" the computer and connected to FoxTelem via VB Audio cable.
Also, I have been using the following USB audio adapter for data audio in/out with success in case you need a device for your computer that can accomodate "line" level audio input:
https://www.amazon.com/Griffin-Technology-iMic- original-Adapter/dp/B003Y5D776
73!
-Scott, K4KDR
===============================
On Sun, Nov 19, 2017 at 2:16 PM, John Brier johnbrier@gmail.com wrote:
Oh interesting. I didn't consider that. I will see if I can hook the radio into my laptop directly, or try another recorder, though my other recorder does 44.1 KHz only, not 48 KHz like the manual says is ideal.
Thanks Paul.
73, John Brier KG4AKV
On Sun, Nov 19, 2017 at 2:11 PM, Paul Stoetzer n8hm@arrl.net wrote:
Seems likely that some sort of audio filtering is going on in your
recorder.
73,
Paul, N8HM
On Sun, Nov 19, 2017 at 2:07 PM, John Brier johnbrier@gmail.com wrote:
I made a cable to tap the 9600 data pin off my Kenwood and I'm trying to decode telemetry from AO-91.
I am having trouble getting a continuously clean reception, so I don't expect frames, which I'm not getting, but parts of the reception are fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am wondering if there is still some filtering going on. I notice the peaks of the "bits" are not flat like they are supposed to be according to the manual:
I am recording the audio off the radio into a Zoom H1 at 48,000 KHz
16bit wav.
Maybe I should try hooking the radio directly up to a computer into
FoxTelem.
Here is my recording:
1743_UTC_-_AO-91_-_FM05_-_KG4AKV_just_transmissions.wav?dl=0
Ideas?
73, John Brier KG4AKV
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
What I understand from the Decoder manual is that 9600 is for special experiments and under normal conditions the data under voice (DUV) is 200 bps hence i dont think 9600 setting needs to be enabled / wired at the radio. 73 Nitin [VU3TYG] From: John Brier johnbrier@gmail.com To: Scott scott23192@gmail.com Cc: AMSAT BB amsat-bb@amsat.org Sent: Monday, 20 November 2017 1:18 AM Subject: Re: [amsat-bb] Foxtelem and Kenwood TM-V71 signal to noise ratio
Thanks for trying Scott.
I do have the 9600 setting enabled. I think you can also set which side of the radio is used for data, and I believe I set it right, but I'm going to double check.
Thanks for the USB sound card link. I actually have a 10 yr old laptop with mic/line in that I might try. If I have to use a laptop during the pass I almost feel like I might as well just go SDR. In general I don't like to have things anchored to the ground and me, which is why I carry all my gear on my body.
73, John Brier KG4AKV
On Nov 19, 2017 2:31 PM, "Scott" scott23192@gmail.com wrote:
Hi John.
No decodes here from your audio recording, either. And the reception was crystal clear.
Did set the data speed menu option to 9600? I don't know if the 1200 setting would work with AO-91's DUV data or not; I use an SDR, so my RX audio is already "in" the computer and connected to FoxTelem via VB Audio cable.
Also, I have been using the following USB audio adapter for data audio in/out with success in case you need a device for your computer that can accomodate "line" level audio input:
https://www.amazon.com/Griffin-Technology-iMic- original-Adapter/dp/B003Y5D776
73!
-Scott, K4KDR
===============================
On Sun, Nov 19, 2017 at 2:16 PM, John Brier johnbrier@gmail.com wrote:
Oh interesting. I didn't consider that. I will see if I can hook the radio into my laptop directly, or try another recorder, though my other recorder does 44.1 KHz only, not 48 KHz like the manual says is ideal.
Thanks Paul.
73, John Brier KG4AKV
On Sun, Nov 19, 2017 at 2:11 PM, Paul Stoetzer n8hm@arrl.net wrote:
Seems likely that some sort of audio filtering is going on in your
recorder.
73,
Paul, N8HM
On Sun, Nov 19, 2017 at 2:07 PM, John Brier johnbrier@gmail.com wrote:
I made a cable to tap the 9600 data pin off my Kenwood and I'm trying to decode telemetry from AO-91.
I am having trouble getting a continuously clean reception, so I don't expect frames, which I'm not getting, but parts of the reception are fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am wondering if there is still some filtering going on. I notice the peaks of the "bits" are not flat like they are supposed to be according to the manual:
I am recording the audio off the radio into a Zoom H1 at 48,000 KHz
16bit wav.
Maybe I should try hooking the radio directly up to a computer into
FoxTelem.
Here is my recording:
1743_UTC_-_AO-91_-_FM05_-_KG4AKV_just_transmissions.wav?dl=0
Ideas?
73, John Brier KG4AKV
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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.org. 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
I will mention that for a Icom IC-9100 you need it in Data 9600 mode, the reason being that 9600 gives you the full bandwidth, in non-data mode the radio filters out the sub-audible tones.
73 Kevin WA7FWF
On 11/19/2017 9:21 PM, Nitin Muttin via AMSAT-BB wrote:
What I understand from the Decoder manual is that 9600 is for special experiments and under normal conditions the data under voice (DUV) is 200 bps hence i dont think 9600 setting needs to be enabled / wired at the radio. 73 Nitin [VU3TYG] From: John Brier johnbrier@gmail.com
Noted Kevin, so my putting the radio in 9600 data mode the audio is now available from the discriminator directly. For some reason I am unable to decode the telemetry from AO85 and AO91 using a ICOM 821H and Signalink USB. Will try soon with an SDR as well. 73 Nitin [VU3TYG]
From: Kevin Schuchmann wa7fwf@gmail.com To: amsat-bb@amsat.org Sent: Monday, 20 November 2017 11:50 AM Subject: Re: [amsat-bb] Foxtelem and Kenwood TM-V71 signal to noise ratio
I will mention that for a Icom IC-9100 you need it in Data 9600 mode, the reason being that 9600 gives you the full bandwidth, in non-data mode the radio filters out the sub-audible tones.
73 Kevin WA7FWF
On 11/19/2017 9:21 PM, Nitin Muttin via AMSAT-BB wrote:
What I understand from the Decoder manual is that 9600 is for special experiments and under normal conditions the data under voice (DUV) is 200 bps hence i dont think 9600 setting needs to be enabled / wired at the radio. 73 Nitin [VU3TYG] From: John Brier johnbrier@gmail.com
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
The signalink USB does not pass 9k6 audio bandwidth
Andrew VK4TEC
Sent from my iPhone
On 20 Nov 2017, at 8:49 pm, Nitin Muttin via AMSAT-BB amsat-bb@amsat.org wrote:
Noted Kevin, so my putting the radio in 9600 data mode the audio is now available from the discriminator directly. For some reason I am unable to decode the telemetry from AO85 and AO91 using a ICOM 821H and Signalink USB. Will try soon with an SDR as well. 73 Nitin [VU3TYG]
From: Kevin Schuchmann <wa7fwf@gmail.com>To: amsat-bb@amsat.org Sent: Monday, 20 November 2017 11:50 AM Subject: Re: [amsat-bb] Foxtelem and Kenwood TM-V71 signal to noise ratio
I will mention that for a Icom IC-9100 you need it in Data 9600 mode, the reason being that 9600 gives you the full bandwidth, in non-data mode the radio filters out the sub-audible tones.
73 Kevin WA7FWF
On 11/19/2017 9:21 PM, Nitin Muttin via AMSAT-BB wrote: What I understand from the Decoder manual is that 9600 is for special experiments and under normal conditions the data under voice (DUV) is 200 bps hence i dont think 9600 setting needs to be enabled / wired at the radio. 73 Nitin [VU3TYG] From: John Brier johnbrier@gmail.com
Sent via AMSAT-BB@amsat.org. 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.org. 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
participants (6)
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Andrew Rich -
John Brier -
Kevin Schuchmann -
Nitin Muttin -
Paul Stoetzer -
Scott