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Re: [Discuss-gnuradio] software controlled antenna

From: Chuck Swiger
Subject: Re: [Discuss-gnuradio] software controlled antenna
Date: Wed, 21 Dec 2005 08:21:39 -0500

At 06:50 PM 12/20/2005 -0800, you wrote:

My current work involves phased-array and adaptive
antennas in the digital domain (at the IF level).

This device (and you experiment) is related to the
same area but concentrated at the RF level (analog).

The gnuradio version might be something like this:

(courier font)

ant 1 --> preamps --> J19 |
                          |Basic Rx --->
ant 2 --> preamps --> J18 |

                                 --> adj phase / mag
                               /           |
usrp.source_c --> deinterleave<            |
nchannels=2                    \           V

That is, one antenna to J19 of a basic RX, another antenna
to J18, two channels input, deinterleave them into two
streams. Then adjust the phase and magnitude of one and
sum them up.   That what the $200 MFJ box does as far as I
can tell.

adj_phase_mag = gr.multiply_const_cc ( mag * complex( math.cos(theta), math.sin(theta) )

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