SDR-1000, both sidebands transmitted even though LSB or USB selected
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SDR-1000, both sidebands transmitted even... Expand / Collapse
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Posted Thursday, October 21, 2010 10:54 AM
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Just purchased a used SDR-1000 and put it on the air. Get reception reports that both sidebands are being transmitted even though I have selected SSB. Switched between LSB and USB, still receiving station still reports my signal has both sidebands. Help!
Post #3294
Posted Thursday, October 21, 2010 12:10 PM


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Check the audio cables that go from the sound card to the SDR-1000 that (a) you have the proper channels (L/R) connected on the sound card and (b) that the 1/8" stereo audio plugs are firmly seated in the SDR-1000.

-----
Tim - W4TME
Post #3295
Posted Thursday, October 21, 2010 1:13 PM
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Assuming that you have done a database reset and attempted the TX image calibration procedure that failed, here are three possiblities for lack of opposite side band suppression in the SDR-1000... Opposite sideband suppression depends on there being equal but 90 degree phase shifted audio signals applied to the SDR-1000 QSE ( quadrature sampling encoder ). You should first verify the you have nearly equal amplitude voltages on the tip to sleeve and ring to sleeve of the cable going to 'TO LINE' on the rear of the SDR-1000.
If the voltages are not equal, you may have a bad cable, a bad sound card ( failed channel) , or something hosed up in the sound card driver. You should also see some audio voltage between tip and ring ( indicates a quadrature signal ) .
If those voltages appear correct, then there could be a failure within the SDR-1000. You may need to contract Flex support.


AL, K0VM
SDR-1000, Flex5000, Flex user since 2006
Post #3296
Posted Wednesday, December 1, 2010 1:51 AM
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HI,

It is soft ware problem.Guess u r using Windows as the O/S.U reload flexradio/windows o/s. Problem of DSB shud get sorted out.We encountered similar problem and fixed by this method.
73
de
vu2gsm
Post #3494
Posted Saturday, July 30, 2011 3:49 PM
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Problem resolved. Sorry for the long delay. Wanted to make sure. The solution was to upgrade to a later version of the Flex software. Then the unwanted sideband went away and I get good reports sideband supression reports now. I am now running V2.0.22.
Post #4664
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