I have been having a debate with my son about the overuse of Auto-Tune in music. Personally, I find it irritating. Then it occurred to me that I had proposed on this BB a long time ago that it would be nifty to have a DSP (Like Timewave DSP-599) that would correct for doppler. Has anyone tried Auto-Tune to correct doppler on a linear transponder?
On 29 Nov 2009 at 23:52, RFI-EMI-GUY wrote:
Date sent: Sun, 29 Nov 2009 23:52:50 -0500 From: RFI-EMI-GUY [email protected] Subject: [amsat-bb] Auto-Tune To: [email protected] Send reply to: [email protected] Organization: Central Scrutinizer
I have been having a debate with my son about the overuse of Auto-Tune in music. Personally, I find it irritating. Then it occurred to me that I had proposed on this BB a long time ago that it would be nifty to have a DSP (Like Timewave DSP-599) that would correct for doppler. Has anyone tried Auto-Tune to correct doppler on a linear transponder?
-- Joe Leikhim K4SAT "The RFI-EMI-GUY"©
A variation used here. On my PCR 1000 i correct the doppler on my 2.4 GHZ downconverter IF with the AFC frequency tuning. It is effective but signal should be always present it loose track in the signal fades but easily corrected manually. Never tested yet on a SSB or CW signal only on FM. "-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE
I believe that automatic tuning of the downlink receiver will only work with FM, as an output of the FM discriminator can be used to give an error (difference) signal for tuning. I don't believe this is possible with an arbitrary SSB signal. The only way SSB/CW can work is to have a known signal to analyze, such as digital or a single CW communication channel. The software used to decode AO-40 middle beacon, for example, was capable of providing a tuning output, and I've seen CW and PSK sound card software do some limited tracking as well. But a random (i.e. voice) SSB signal? Don't think that's possible.
Greg KO6TH
From: [email protected] To: [email protected] Date: Mon, 30 Nov 2009 00:20:58 -0500 Subject: [amsat-bb] Re: Auto-Tune
On 29 Nov 2009 at 23:52, RFI-EMI-GUY wrote:
Date sent: Sun, 29 Nov 2009 23:52:50 -0500 From: RFI-EMI-GUY [email protected] Subject: [amsat-bb] Auto-Tune To: [email protected] Send reply to: [email protected] Organization: Central Scrutinizer
I have been having a debate with my son about the overuse of Auto-Tune in music. Personally, I find it irritating. Then it occurred to me that I had proposed on this BB a long time ago that it would be nifty to have a DSP (Like Timewave DSP-599) that would correct for doppler. Has anyone tried Auto-Tune to correct doppler on a linear transponder?
-- Joe Leikhim K4SAT "The RFI-EMI-GUY"©
A variation used here. On my PCR 1000 i correct the doppler on my 2.4 GHZ downconverter IF with the AFC frequency tuning. It is effective but signal should be always present it loose track in the signal fades but easily corrected manually. Never tested yet on a SSB or CW signal only on FM. "-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE
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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At 07:08 PM 11/30/2009, Greg D. wrote:
I believe that automatic tuning of the downlink receiver will only work with FM, as an output of the FM discriminator can be used to give an error (difference) signal for tuning. I don't believe this is possible with an arbitrary SSB signal. The only way SSB/CW can work is to have a known signal to analyze, such as digital or a single CW communication channel. The software used to decode AO-40 middle beacon, for example, was capable of providing a tuning output, and I've seen CW and PSK sound card software do some limited tracking as well. But a random (i.e. voice) SSB signal? Don't think that's possible.
I have heard of it being done in a laboratory/research setting (though not 100% sure how good my sources were), but not in production.
73 de VK3JED / VK3IRL http://vkradio.com
True, but why are we generally obsessed with carrier leak (or a lack of it) on SSB signals? A bit of leak, say 20-30dB below peak, would allow for synchronous detectors and frequency tracking of drifting signals by the radio, no computer involved.
Greg D. wrote:
I believe that automatic tuning of the downlink receiver will only work with FM, as an output of the FM discriminator can be used to give an error (difference) signal for tuning. I don't believe this is possible with an arbitrary SSB signal. The only way SSB/CW can work is to have a known signal to analyze, such as digital or a single CW communication channel. The software used to decode AO-40 middle beacon, for example, was capable of providing a tuning output, and I've seen CW and PSK sound card software do some limited tracking as well. But a random (i.e. voice) SSB signal? Don't think that's possible.
participants (5)
-
Greg D. -
Luc Leblanc -
Nigel Gunn G8IFF/W8IFF -
RFI-EMI-GUY -
Tony Langdon