[Discuss-gnuradio] HF front end for USRP (and other ADCs)

[John Ackermann N8UR]

I'm always nervous about pre-announcements, but there seem to be a fair
bit of interest in this topic lately, so here goes...

I'm working on an HF RF front-end project that will be available through
TAPR (http://www.tapr.org).

The circuit lineup will basically be a low pass/high pass filter
combination (to knock down strong AM, FM, and TV stations followed by a
20dB amplifier, which feeds six output channels.

Each output channel will have a bandpass filter; the idea will be that
across the six outputs you can cover the whole HF spectrum with good
selectivity.  Alternatively the filters can be bypassed for other uses.
 The outputs will be DC isolated and transformer coupled to minimize
ground loops and signal feedthrough.

One of my ideas is that with this board plus two BasicRX boards you can
run four simultaneous HF receivers with decent performance.

I'm hoping the board will be available within 3 months or less, and the
price should be around $100 as a kit.

I have no idea how many people might be interested in this.  If you are,
please drop me a line so I can get some sense of how many kits to
initially package.

John
----
Matt Ettus said the following on 12/20/2006 02:05 PM:
> Heiko Jones wrote:
>> Hey Matt,
>>
>> What sort of basic circuit would I need to make to enable my basic RX
>> daughterboard to receive some of the ham bands, I am interested in
>> specifically WWV and WWVB right now. I can make my own dipole antenna
>> easily enough, but I was reading your faq, and was wondering what all
>> was entailed in: " For reception you would need to add gain and
>> filtering in front of the BasicRX daughterboard. This can be done
>> pretty easily with MiniCircuits parts..." Do you have any simple
>> schematics or at least what would need to be done? I am assuming a
>> preamp of sorts, but what about the filtering? I don't have any ham
>> equipment at all and have not really had to do any antenna stuff since
>> school...
> 
> 
> I would use a simple bandpass filter around the frequency of interest
> and then an RF amplifier.  Another option would be so-called active
> antennas, which you can get from radio shack. 
> 
> Matt
> 
> 
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