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Re: [Discuss-gnuradio] ham/amateur getting started

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] ham/amateur getting started
Date: Tue, 29 Dec 2015 13:05:25 +0100
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>From the customer support perspective:

The E310 is a very nice device from an analog point of view, but be warned:
The E310 is an embedded device; it runs Linux on its own CPU, and you
have to develop your signal processing software to run on that CPU; if
you need to do something with serious bandwidth, you might even have to
resort to FPGA programming, because the CPU in the E310 definitely isn't
comparable to a Laptop or desktop CPU in performance.
It cannot really be used as a peripheral to a PC.

Generally, I do advise to use the E310 if you know you have a standalone
application that requires operation with little power on limited
bandwidths; and even then, I recommend that people get a B210 and
develop their signal processing on a PC using that, before porting your
software to the E310 (the UHD API is the same).

Best regards,

On 12/29/2015 12:43 PM, John B. Wood wrote:
> On 12/25/2015 01:02 PM, David McQuate wrote:
>> Broadcast radio & TV transmitters, police & fire repeaters, and
>> others have potent signals.  If your system does not attenuate them,
>> by using low-pass, high-pass, or band-pass filters, the peak voltage
>> at your analog to digital converter may at times exceed "full
>> scale".  The resulting non-linear response produces many spurious
>> signals, that may mask the typically weak signals you are wanting to
>> recieve.  An initial solution is to use broad-band attenuators to
>> keep the total power reaching the ADC below full scale.  Then observe
>> the spectral peaks and insert appropriate filters to knock them
>> down.  The attenuation may then be reduced.  Frequently AM
>> broadcasters are the worst.  A high-pass with cutoff around 1.6 MHz
>> may be all you need.
> Hello, and the Ettus USRP E310 has the front-end filters that may well
> accomplish the required receive preselection and transmit spurious
> filtering.  Granted, the price of a E310 may put it out of
> consideration by many hams.  Sincerely, and 73s from N4GGO,
>                                             J. Wood
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