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Locked Re: Pixel-RF-PRO-1B receive magnetic Loop


 

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Re battery backup of the Pro-1 loops ...

The power coupler supplies 20V DC (nominal) to the coax, and is normally powered with a 24V AC (RMS) transformer. It is possible to replace the transformer with a floating DC source such as a battery, but it will need around 26V DC.? A pair of 12V gel-cell batteries in series should work.?

One could try a 12V-120V inverter for battery power, but from theoretical considerations it would need to be a sine wave or at least a modified sine wave inverter. And, there is always the electrical noise issue with inverters.

Jack K8ZOA



On 2/4/2014 7:08 AM, John wrote:

?

So, Dominique, you've tried them both and prefer the Wellbrook - or you interpret Guy's data and agree with his conclusion? Go to Pixel's site and you'll find the Pro-1 beats the Wellbrook. I wouldn't expect a commercial site to use an unflattering comparison in their advertising.

I certainly have built my share of antennas - TTFD, slopers, dipoles bi-Beverage, long wires - active antennas - even remotely tuned/amplified balanced loops. I have a technical background - got my FCC First Class Radiotelephone license 9/68; was a USN ET ('69-'72); taught electronics/telecommunications '75-'95; and chiefed at several FM stations and part-time at one AM station. Why would I spend most of $400 on something I could build? In retrospect, that decision three years ago was a good one.

I bought my Pro-1A three years ago to replace my wire antennas, whose ancient tree supports had succumbed to disease and/or the ravages of weather, the worst of which was destined to test the Pixel antenna 4/2011 & 1/2012 in two tornadoe near misses. The first one dislodged some roof shingles, as it was airborne here, but the second one turned the loop as it emptied the deck the antenna was mounted to and redistributed my wife's wind chimes, totally destroying homes a block away. I had chosen the Pixel for it's robust and modular construction - and it had paid off. Having been 'made in the USA' didn't hurt, either. Last summer found my wife and I moving - after 36.5 yr - to a garden home.

The new home has a Home Owner's Association - with by-laws prohibiting outside antennas. I carried my Pro-1A up the stairs to the floored tall attic and mounted it's 5 ft mast in a tripod mount and set it high and as clear of interference as I could, hooking it's RG6 feed to an existing such feed to my 'office' below. I now have the best and most QRM-free reception I've ever had. The background noise is minimal - and the desired signals are stronger than I recalled at the old house 3 miles away. The background noise is practically non existent, from the 200 kHz remaining aeronautical beacons to MW BCB stations to tropical bands to SW BCBs, as sparsely populated as they now are. It's directional nature permitted reduction in a QRM source - the metal cylinder in my yard (buried utilities) which contains the fiber optic/twisted pair DSL modem was DFed with my Tecsun PL-660 as the culprit. In all honesty, protected from the elements - in my attic - the Wellbrook would have been fine.

I spent most of $400 on my Pixel simply because I had it - returns from another hobby-item's sale. I don't regret it one bit - it and the R30A - resurrected my longtime hobby. I even got my NRD-525, R8, & HF-150 out of storage and since bought a used R75 and HF-225 - all sharing the Pixel antenna. One minor regret, born from my prior experiences with power outages - no 12V power inserter for battery power. I can remedy that after I find my soldering iron! If you've never tried a decent shielded loop antenna, you need to. Whether you build or buy is up to you.

John

--- In loopantennas@..., "Dominique Kremp" wrote:
>
> Hi folks,
>
>
>
> Just have a look at this review from Guy Atkins:
>
>
>
> I fully agree with him !
>
>
>
> Dominique
>
> Normandy, France
>
>
>
>
>
> De : loopantennas@... [mailto:loopantennas@...] De la part de dstremme@...
> Envoy?? : lundi 3 f??vrier 2014 21:06
> ?€ : loopantennas@...
> Objet : [loopantennas] Pixel-RF-PRO-1B receive magnetic Loop
>
>
>
>
>
> Hello one and all
> NEW Member here
> Just started working at Pixel Technologies
>
>
> always looking for product feedback, suggestions, etc.
> I'm learning the product as I go - willing to provide what assistance I can
> and learn from the users what works, what would make it better etc.
>
> Thx in advance
> David
> KA0IJV
>


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