[time-nuts] SDR Radio Opinion- Next Question

[wb6bnq]

Hi John,

I don't think you quite got it yet.  All of those types of "Dongles" 
have no frontend filtering and no gain control (AGC).  Basically it is a 
"diode" (so to speak) looking at the spectrum from DC to Daylight, even 
though they have a limited range.  So, yes, there will be birdies and 
aliasing issues.  There is no software from a unit's manufacturer for 
the "All Frequency" observation mode that Amateur radio and other 
hobbyists are using it for.

Aside from all that , they do come in a plastic case and there is some 
excelent control software, notably Simon Browns HDSDR,  that can control 
a number of these types of umits.  As for spectrum software, the best 
one is Spectrum Labs which can take I/Q input.  See the respective web 
sites for more information.  Both of these packages are FREE.

http://www.hdsdr.de/hardware.html   The SDR software hardware page

http://www.qsl.net/dl4yhf/spectra1.html    The Spectrum Lab software.

Bill....WB6BNQ


J. Forster wrote:

>OK. Thanks everybody. Can you please reccomend a make/model?
>
>I'd like something like:
>
><75 to >1300 MHz
>USB
>Ability to function as a crude SA.
>Not crawling w/ birdies or aliasing issues.
>Will run on Win XP.
>Demod selecttable for all modes at all frequencies.
>In a package, rather than a loose PCB.
><$150
>
>Prefer:
>
>SMA rather than RCA or F
>Receiver and SW from same vendor.
>
>Suggestions, please.
>
>Thanks,
>
>-John
>
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