Topband: SDR-1000 IMD-DR, blocking dynamic range, IP3, and IP2 measurements

[Michael Tope]

----- Original Message ----- 
From: "Bill Tippett" <btippett at alum.mit.edu>
To: <topband at contesting.com>
Sent: Friday, February 16, 2007 3:17 AM
Subject: Topband: SDR-1000 IMD-DR, blocking dynamic range, IP3, and IP2 
measurements


> W4EF:
> >"It has essentially the same dynamic range regardless
> of tone spacing"
>
>         True but BDR is ~100 dB for the SDR-1000 versus
> ~130 for other rigs (ARRL measurements).  BDR seems to be
> the weak point of SDR so far.  Perhaps 32-bit sound cards
> will eventually solve this issue but current 24-bit sound
> cards all seem to share this weakness.
>
>                                 73,  Bill  W4ZV
>

Yeah, seems that is the achilles heal of the SDRs right now.
As you suggest, it will be interesting to see how the equation
shifts as the sound cards get better.

73, Mike W4EF.........................................