[Lowfer] Varactor-Tuned Loop Antennas

[Ed Phillips]

Chris Trask wrote:

>    I finally completed the work that I have been doing on a simple
>varactor-tuned loop antenna with interchangeable antenna elements.  The
>documentation is available at:
>
>    http://tinyurl.com/6lht4y
>
>    A little more work needs to be done here as the inductance of the
>transformers is limiting the high end of the tuning range.  However, the
>results obtained at this point show that the sensitivity is far better than
>I had anticipated, and together with the very good S/N performance this
>design rivals the performance my earlier active loop antenna that was
>published in QEX back in 2003.
>
>    Corrections and constructive comments are always appreciated.
>
>Chris
>

Did you measure Q?  Did you look for intermodulation with big signals?  
Neat design.

Ed