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tuning below & above the center frequency
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On my Ensemble RX LSB signals (on 40 meters, for example) tune below (in LSB mode) the "center frequency", they tune perfect, but above that center frequency while it says it is higher frequencies above the center frequency, What I see signal wise above the center frequency are duplicates of signals that are below the center freq. If I put RX in USB mode on these signals above the center I can hear them . . . they are the same signals below the center that comes in LSB, like they should be.
The frequency readout above the spectrum display shows from about 7.235 - 7284, but I am not tuning up to 7.284, again, instead just what I see & hear below the center frequency is above the center frequency too, but in USB mode. Is this right ? What am I missing or not understanding here ? I am using Winrad v1.33 or sometimes HDSDR v2.8 software, what I see, occurs on both. My center is set to 7.260. Al |
If I put RX in USB mode on these signals above the center I can hear them . . . they are the same signals below the center that comes in LSB, like they should be.Al, You are feeding HDSDR with a mono signal. Is the soundcard stereo? Has the Ensemble an output on both channels? If so are they shorted together? Is HDSDR set for IQ input? 73 Alan G4ZFQ |
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I have used quisk on my linux boxes with NotSDR receivers and use just one side of the display.? Works great. I now have a stereo input (in addition to the regular stereo out) USB sound card. Those old receivers still don't have I-Q output for the sound card but the half that does work is still useful. When I build my softrock that stereo input will be twice as useful:)
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73, Bill KU8H bark less - wag more On 1/27/22 2:28 PM, Alan G4ZFQ wrote:
If I put RX in USB mode on these signals above the center I can hear them . . . they are the same signals below the center that comes in LSB, like they should be.Al, |
I am thinking more & more that the SEWELL box I have is part of my problem. Al, Is this it ? Now I can't get anything out of the Ensemble, the I & Q from the Ensemble RX goes thru the SEWELL box as STEREO IN ( L & R ) and the SEWELL OUTPUTS via the USB to the PC> Like I said now I just get noise, like the I & Q signals are not there. It should work if you have the connections and settings correct. Just about any stereo USB sound device should work. What OS? Microphone privacy settings stop sound working on later systems if not set correctly. 73 Alan G4ZFQ |
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The RX is working again, it is back to OK. Except for the odd things I been trying to correct.
I still have the spectrum from LO frequency to left working correctly and what is on the right in spectrum of LO is a duplicate ( signal wise ) of what is on the left of LO, even though frequencies that display on RIGHT of LO in spectrum display are higher then left frequencies displayed in spectrum. Somebody mentioned a short on the I & Q signals, if there was a short would it not work at all, if I & Q were shorted together? But I did check and there are no shorts. As mentioned before it does these things on, Winrad & HDSDR . . . Rocky 3.8 works to but that has additional display issues, like I can't get all the frequencies the Rocky 3.8 setting claims to cover. Rocky 3.8 seems to be missing some frequencies. But again - it works, sounds good and tuned frequency is the correct frequency on all 3 softwares. Al |
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Hi,
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If you have a mirror copy of the spectrum above the LO this always is caused by a big unbalance of the IQ signals. The imbalance can be caused by: - The RX is not generating either I or Q signal. You can check this using a strong CW signal and a dual channel oscilloscope to see that the amplitudes are the same and the phase is in quadrature. - The audio cable has one of the channels missing or have a short between them so I and Q are the same. - The audio input is not stereo. This happens in most laptops. -The audio input card or USB audio device has a problem. There was a ADC chip that sampled the channels alternatively so the samples were displaced in time. Most SDR software does not correct this. There was one that did it, but I don't remember which one. Since the current audio input device could be the culprit, try with another audio system, for example an USB card. Beware that most audio input dongles are mono. Regards, Ignacio EB4APL El 28/01/2022 a las 23:53, al2ok escribió:
The RX is working again, it is back to OK. Except for the odd things I been trying to correct. --
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EB4APL,
Thank You, with what you explained I think I found the problem ! The right channel ( I or Q ) is not getting out of the Ensemble to the SEWELL audio box. It looks like the stereo plug I am using for whatever reason is not making contact to receive the channel from the jack on the Ensemble. The right channel is the "ring" on the plug. Checked it for continuity with a DVM and it proves it is not getting out of the Ensemble. It seems it is the STEREO plug I am using, it fits OK into Ensemble jack but for whatever reason the " ring" is not making contact with the Ensembles jack connector, only on the R channel ,the L( tip ) is OK.. Looks like it is happening on one particular plug I used to make up a cable that comes out of Ensemble, because I used the other end of that plug to go into the SEWELL for the R and it too looks like is not making contact on that end too. Again LEFT is OK. Never saw this before, I have to get new STEREO plugs and try them. Any thoughts on type I should get? Al |
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Al I have had a similar issue in the past and found that I had simply not pushed the jack into the socket far enough.
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Sometimes the last mm or so needs an extra hard push to get it in. Apologies if this seems an odd comment but if it is the cause it would be simpler than a new jack! Regards John G0UCP ------ Original Message ------
From: "al2ok" <al2@...> To: [email protected] Sent: Saturday, 29 Jan, 22 At 16:57 Subject: Re: [softrock40] tuning below & above the center frequency EB4APL, Thank You, with what you explained I think I found the problem ! The right channel ( I or Q ) is not getting out of the Ensemble to the SEWELL audio box. It looks like the stereo plug I am using for whatever reason is not making contact to receive the channel from the jack on the Ensemble. The right channel is the "ring" on the plug. Checked it for continuity with a DVM and it proves it is not getting out of the Ensemble. It seems it is the STEREO plug I am using, it fits OK into Ensemble jack but for whatever reason the " ring" is not making contact with the Ensembles jack connector, only on the R channel ,the L( tip ) is OK.. Looks like it is happening on one particular plug I used to make up a cable that comes out of Ensemble, because I used the other end of that plug to go into the SEWELL for the R and it too looks like is not making contact on that end too. Again LEFT is OK. Never saw this before, I have to get new STEREO plugs and try them. Any thoughts on type I should get? Al |
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It is FIXED !!!
Turns out what EB4APL (and a afew others said) said about missing either an I or Q signal was correct . . . it was not the plug going into the Ensemble nor the Ensemble's jack. Like I said I use that SEWELL box to go from "regular audio cable " to USB into my PC. Well one of those plugs was bad going into the SEWELL, ( the SEWELL accepts R & L Individually so I had to make a "Y" from the Ensemble ) replaced that bad plug and it works now, no more mirroring image above the LO, instead it is tuning above & below the LO perfect, tuning all frequencies. By the way. . . in old terms . . . you got left & right channel, what channel is the I on and what channel is the Q on ? I believe you can make this anyway you want but normally what channels is I & Q on ??? again Thanks to all. Al |
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Hi,
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It is difficult to say in absolute terms but If you receive an USB station, for example Hams in 20 M band, and you get it right this is the good configuration for your radio. If you receive it inverted (and the spectrum is also inverted) you must swap the cables. Anyway most SDR software has provisions to invert this so you don't need to exchange the connections. Regards, Ignacio EB4APL El 30/01/2022 a las 17:25, al2ok escribió:
It is FIXED !!! --
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