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

[Ralph A. Schmid, dk5ras]

Hi,

First of all, the USRP radios are kind of experimental radios, using them for 
real ham radio operation on antennas will require filters and PAs. "Out of the 
box" it will only be some proof of concept when you create a ham radio 
application with it. 

All 50 ohms, no limitations other than upper and lower border, regarding 
frequency. But connecting a roof-top antenna will most likely not work, due to 
the lack of preselection, you will receive lots of images and other garble.

Ralph, dk5ras. 

> -----Original Message-----
> From: address@hidden [mailto:discuss-
> address@hidden On Behalf Of Daniel Pocock
> Sent: Thursday, December 24, 2015 13:27
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] ham/amateur getting started
> 
> 
> 
> On 24/12/15 08:31, Marcus Müller wrote:
> > Forgot:
> >
> > [1] http://marcus.hostalia.de/sdra/pres.pdf
> >
> 
> 
> Thanks for the fast reply, I had a look and I notice you emphasize the USRP
> products, you mention the B200 and B210 (the OZ9AEC link I found also
> mentioned USRP but didn't specify model numbers)
> 
> I had a look at the FAQ[1] and spec sheet[2] to try and find comments about
> amateur radio use cases, for example,
> - how much TX output power?
> - suggestions about use with an external TX power amplifier
> - is RX or TX restricted on any frequencies by hardware?
> - antenna impedance (50 Ohm?)
> 
> and I didn't find any comments on these things.
> 
> Looking at the accessory list I found that 782781-01 is a 50 Ohm cable so I 
> guess
> everything is 50 Ohm?
> 
> Even before getting into the software setup, is there any useful guide on
> hardware considerations for SDR in an amateur station?  For example:
> - power supply requirements
> - risk of interference between difference devices in the shack, precautions
> - use with other typical amateur equipment (antennas, RX pre-amplifiers, TX
> power amplifiers)
> - suitability for mobile use-cases, using DC/battery or vehicle power and 
> with a
> laptop or even a tablet as user interface
> 
> Any feedback or links would be really helpful, maybe they could go in the GNU
> Radio wiki Ham page too.
> 
> 
> 1. http://www.ettus.com/kb/detail/usrp-b200-and-b210-faq
> 2. http://www.ettus.com/content/files/kb/b200-b210_spec_sheet.pdf
> 
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