m-audio firewire solo
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Posted Tuesday, November 28, 2006 9:49 PM
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has anyone successfully used the m-audio firewire solo for the SDR-1000?
i got the receive to work great but when i transmit i get a constant 45-50 watts out... even when I'm on ssb.
does it have to do with the soundcard output voltage?

thanks,

Blaine N1GTU
Post #70
Posted Wednesday, November 29, 2006 11:22 AM
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Blaine,

From what I understand, the FireWire Solo does not have the necessary I/O to work well with the SDR-1000 for both receive and transmit.  Ideally we would like to have 3 independent analog inputs and 4 independent analog outputs.  But we can get away with just 2 of each provided that you can switch between the inputs from line in to a microphone type input.  I suspect this is at least part of the problem.

Eric Wachsmann

FlexRadio Systems

Post #71
Posted Wednesday, November 29, 2006 1:43 PM
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Thanks for the response,
I also have a Delta 1010 so i will give that a try.
I was hoping one of these soundcards would work for me.
if not i will pick up a supported card.
Post #72
Posted Monday, December 11, 2006 5:30 PM
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well i connected up the Delta 1010.
i used the quick start guide for the delta 44 and everything worked great..
except i am still getting the 45 watts out on ssb
there appears to be a signal down about 11khz no matter where i tune on the bands.
someone told me this was a ground loop common to the delta soundcards.
could this be causing the strange output signal on transmit?
any help would be appreciated.
thanks
Post #89
Posted Tuesday, December 12, 2006 2:37 PM


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What you are seeing is not a ground loop, but the DC noise (0 Hz) of the 11KHz IF. It will always be there. It can be more or less prominent depending on what sound card you use. Higher quality sound cards have less DC noise.


-----
Tim - W4TME
Post #91
Posted Tuesday, December 12, 2006 6:32 PM
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ok this is the signal i am talking about, the flex is connected to a 50 ohm dummy load




I also found that when i transmit on AM the carrier is 11khz low.
it is correct on USB and LSB
but no audio is being transmitted even though it comes through the MON and shows on the spectral display
Post #92
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