Hey, Jerry, Thanks..... saw this article about 3 months ago and I read all of the associated material too. The final paragraph in one of the articles states:
"Although they haven’t yet measured the far field directly, Kemp and coworkers used measurements of losses in their system and theoretical models for dipole antennas to determine that their radiation efficiency is 300 times that of a similarly small metal antenna." Although *they haven't yet measure the far field????* really!!! ......but that is what it is all about???...the far field. I guess, you have to start somewhere. Getting the rod to radiate is a start and making it 300 times more efficient than a short metal antenna, which at those frequencies probably has an efficiency of (point)3 percent depending on the length. OK.....just getting something to radiate is one thing (and pretty cool), but getting it to perform to place signals where you want them to go is another matter of phasing, height, etc. Kind of like The Radio Hotel I wrote about non-Foster elements in April 2017. I was not convinced that their experimental Chu's Limit busting discoveries would help us in the HF arena while running 1.5KW. Same as this experimental method to radiate VLF from a small piezo-electric "device". (Not sure I want to call it an antenna). So these lithium niobate rod base devices work great when pumping power into them and getting it to radiate most all of the input power into the ether. But...what about on receive? Does this stuff work within an input field strength of 2 to 3 uV? If not, I guess we could apply receive mag loop antenna practices or even flag or pennant devices to keep things equally small on receive. Gain, on receive, is available at the push of a button on the front of your radio.....just keep cascading pre-amps. Think back to 1960's and your pocket transistor radio....pull it apart and find the 3 inch by .5 " ferrite rod based receive antenna and how it picked up CKLW in Windsor, on the east coast (well, at least it did for me in W3-land). all that for a 200 meter long AM radio signal. Pretty good on receive....but 50KW transmitter feeding a full size vertical array is not the stuff the local HOA approves. So..... we now have digital modes to communicate where we don't have to hear the signal to send our messages and now with antennas like this we don't even need aluminum in the air, just a lithium niobate rod....not sure I like were my Father's Ham Radio is going.....but that's just me and my garage full of roller inductors, variable capacitors, enameled wire, antenna insulators and coax. 73...Rick The Radio Hotel W5RH On Fri, Sep 13, 2019 at 6:38 PM Bill Cordell <[email protected]> wrote: > Man-o-man… > > I just sold my last lithium niobate rod to my lawn guy… > > Oh yea, what is a Gacrux? The start above the cross ?? > > W5vom > > > > *From:* BVARC <[email protected]> *On Behalf Of *gmuller885--- via > BVARC > *Sent:* Friday, September 13, 2019 4:08 PM > *To:* [email protected] > *Cc:* [email protected] > *Subject:* [BVARC] Fwd: [tdxs-list] The Future HOA Compliant Antenna? > > > > Rick the antenna Gacrux > > What do you think of this > > > > Gerald Muller *K9GEM* > > *USN DSC (SW) Retired* > > *[email protected] <[email protected]>* > > ------------------------------ > > From: [email protected] > To: [email protected] > Cc: [email protected] > Sent: 9/13/2019 7:11:50 AM Central Standard Time > Subject: [tdxs-list] The Future HOA Compliant Antenna? > > > https://www.electronicdesign.com/analog/piezo-based-approach-dramatically-shrinks-vlf-antennas?NL=ED-001&Issue=ED-001_20190913_ED-001_126&sfvc4enews=42&cl=article_1_b&utm_rid=CPG05000003770101&utm_campaign=28319&utm_medium=email&elq2=ab6ef8d20740409aa5f61348b723e20f&oly_enc_id=1017B6675490H5V > > -- Rick Hiller *e-mail: [email protected] <[email protected]>* *Cell: 832-474-3713* *Physical: 9031 Troulon Drive* * Houston, TX 77036*
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