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SDR - Now there`s an app for that!
Submitted by: NZ0I on 6/15/2010 6:48:35 PM UTC

iSDR - a Software Defined Radio application for the Apple iPhone«, iPod touch« and iPad? is offered as a free download, with no advertising, as a gift to the Amateur Radio community. If you own a compatible Apple product then you can visit the iTune...
Automatically-Tuned Loop Antenna for SDR/Janus/Ozy
Submitted by: WR5H on 9/24/2007 9:26:15 PM UTC

In these days of antenna restrictions, there has been much discussion of small, easily transported, and discretely deployed hf antennas. One of these antennas is the small transmitting loop, which most generally consists of copper tubing formed in ...
Soft Rock information
Submitted by: WA8SRA on 4/18/2007 2:14:07 AM UTC

Since I continue to receive several requests a week from people wishing to order Soft Rock products, I thought it might be good to publish the information here.
 
Automatically-Tuned Loop Antenna for SDR/Janus/Ozy
Submitted By: WR5H, 9/24/2007 9:26:15 PM UTC
In these days of antenna restrictions, there has been much discussion of small, easily transported, and discretely deployed hf antennas. One of these antennas is the small transmitting loop, which most generally consists of copper tubing formed in a loop with diameters ranging from less than a foot (for vhf use) to large structures intended for 80 and 160 meters. The loop circumfrence can be less than 1/10 wavelength and the loop is brought to resonance with a capacitor across the endpoint of the loop. Efficiences can run very high, even into the 90 percent range, and the antenna seems to operate quite well even close to the ground. The loop, however, exhibits extremely high Q, and bandwidths can be in the low tens of kilohertzs. This necessitates constant tuning of the antenna capacitor to resonate the desired operating frequency.
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AutomaticAntenna Project
Submitted by: TA3BQ on: 2/5/2008 12:05:54 PM UTC

Thanks for this nice project.. Ízhan TA3BQ
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Loop Antenna: automatic turning
Submitted by: HB9LAM on: 4/21/2008 7:03:26 PM UTC

very interesting. I use myself 2 magnetic loops. I tune them manualy. This is sometimes time consuming. It would be quite helpful, to have an automatic tuning tool. Perhaps even independent of SDR so that it could be used with other DSP programs. 73! Arthur HB9LAM
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Any body have hardware and/or software to do the loop auto tuning?
Submitted by: K8KO on: 3/22/2012 7:34:40 PM UTC

I have a loop with stepper motor to remotely tune the capacitor. Has anyone done an auto tuner with Arduino or other MCU?
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