[Flexradio] Fw: WSPR
I am using my QRP SDR1000 to run WSPR, which is Joe's K1JT new mode (aided by Murray ZL1BPU). The 1watt SDR1000 is ideal for the mode, and I am monitoring my transmitter on another receiver and computer also running WSPR and Winrad. I can see that the SDR1000 is transmitting the 1500hz tone, but it is also transmitting 2 tones, probably exactly 100hz above and below the 1500hz main signal. These two signals are about 24 to 26db below the main signal. They are very obvious on both the WSPR screen and on Winrad. My questions therefore are, Are these signals due to the SDR1000 and if so how do I reduce the amplitude of these 2 signals. Comments please Thanks and best wishes to all Flexers Ross ZL1WN __ Information from ESET NOD32 Antivirus, version of virus signature database 2995 (20080402) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
Re: [Flexradio] Fw: WSPR
Hi, Ross. I'm also using the SDR-1000 for WSPR. In fact, I received your signal four times this morning! No, the signal should be quite narrow, and if you have other products within 25dB or so below or above, it's not normal...but I have seen it. I would suspect a mixing artifact from some other program which has the VAC open, even if they don't seem to be outputting sound. When I had the VAC as the default sound device in windows (before WSPR supported selecting different devices), this would happen whenever I had IE open, of all things. Maybe I should offer my 100WPA for sale, as I seem to be using the SDR-1000 for QRPp almost exclusively :-). --bruce W1BW On Apr 2, 2008, at 7:57 PM, Ross Biggar wrote: I am using my QRP SDR1000 to run WSPR, which is Joe's K1JT new mode (aided by Murray ZL1BPU). The 1watt SDR1000 is ideal for the mode, and I am monitoring my transmitter on another receiver and computer also running WSPR and Winrad. I can see that the SDR1000 is transmitting the 1500hz tone, but it is also transmitting 2 tones, probably exactly 100hz above and below the 1500hz main signal. These two signals are about 24 to 26db below the main signal. They are very obvious on both the WSPR screen and on Winrad. My questions therefore are, Are these signals due to the SDR1000 and if so how do I reduce the amplitude of these 2 signals. Comments please Thanks and best wishes to all Flexers Ross ZL1WN __ Information from ESET NOD32 Antivirus, version of virus signature database 2995 (20080402) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/ ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
Re: [Flexradio] Fw: WSPR
you may be overdriving your input have you tried lowering the tx gain to see if it does anything... also WSPR only uses about 6 Hz according to Joes site so you can crank the tx filter width way down... see if that gets rid of the extra transmitted signals Ray J W9RAY I am using my QRP SDR1000 to run WSPR, which is Joe's K1JT new mode (aided by Murray ZL1BPU). The 1watt SDR1000 is ideal for the mode, and I am monitoring my transmitter on another receiver and computer also running WSPR and Winrad. I can see that the SDR1000 is transmitting the 1500hz tone, but it is also transmitting 2 tones, probably exactly 100hz above and below the 1500hz main signal. These two signals are about 24 to 26db below the main signal. They are very obvious on both the WSPR screen and on Winrad. My ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
Re: [Flexradio] Fw: WSPR
Tim and Bruce, thanks for the replies, Tim I assume you mean the transmit rejection. If so I dont have a Spectrum analyzer, but can check by listening on a second receiver, and using Winrad, With the following result. Enabling the tone and adjusting the phase and gain brings up another carrier approx 1khz away. Putting the gain and phase back to 0.0 eliminates this carrier. I could repeat the test and obtain the exact frequency difference if needed. While running the test I can see the spur 100hz below the carrier tone. Adjusting the phase and gain does not alter this spur at all. Checking while transmitting WSPR on both the Winrad screen and WSPR the spur is 30db down from the main carrier. Bruce, another person with the same idea for the SDR1000 QRP , at last a good use for it !!. Nothing else is running on that computer, The SDR has its own computer and nothing else is running apart from WSPR. Regards and thanks Ross ZL1WN So ideas please - Original Message - From: Tim Ellison [EMAIL PROTECTED] To: Ross Biggar [EMAIL PROTECTED] Sent: Thursday, April 03, 2008 1:36 PM Subject: RE: [Flexradio] Fw: WSPR Have you done the TX Image calibration lately? -Tim -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ross Biggar Sent: Wednesday, April 02, 2008 7:57 PM To: FlexRadio@flex-radio.biz Subject: [Flexradio] Fw: WSPR I am using my QRP SDR1000 to run WSPR, which is Joe's K1JT new mode (aided by Murray ZL1BPU). The 1watt SDR1000 is ideal for the mode, and I am monitoring my transmitter on another receiver and computer also running WSPR and Winrad. I can see that the SDR1000 is transmitting the 1500hz tone, but it is also transmitting 2 tones, probably exactly 100hz above and below the 1500hz main signal. These two signals are about 24 to 26db below the main signal. They are very obvious on both the WSPR screen and on Winrad. My questions therefore are, Are these signals due to the SDR1000 and if so how do I reduce the amplitude of these 2 signals. Comments please Thanks and best wishes to all Flexers Ross ZL1WN __ Information from ESET NOD32 Antivirus, version of virus signature database 2995 (20080402) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/ __ Information from ESET NOD32 Antivirus, version of virus signature database 2996 (20080403) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
