The images on this internet web page were taken during this more recent restore, after the unit had been in steady service for 12-13 years. Click on small photos for larger view in separate browser/tab. Drill two holes holes through the diameter of the PVC pipe to support the small loop in the proper orientation. At the bottom of the loop was welded a small plate of steel as might be seen near the left aspect in the bottom picture of Figure 1. This plate was welded in the course of the loop, opposite the gap at the highest and such that when the plate was bolted to the side of the utility box, it held the loop upright. Working with him, I sketched out the design for a shielded loop and the result was that visible in Figure 1. Since he was useful with a welder and had a lot of pieces around it was a pure to make it out of scrap items of 1/2" electrical conduit and using a conduit bender he fashioned a "sq. loop" that was about 18" (45cm) on a side as proven in the image. When the loop was made with a conduit bender, the 2 ends of the loop have been brought shut collectively, however not touching, and this gap is coated by the black tape/tubing seen at the highest of the loop in the picture!

In order for this to work nonetheless, there needs to be a hole within the shield or else it will simply "quick out" the impinging magnetic subject from the desired signal and for causes mechanical, electrical and symmetrical, it's best that this gap be proper in the middle of the loop. Note that an attic set up will not work effectively if you have aluminum-skinned insulation on the underside of the roof (or a metal roof). For receive-only APRS monitoring or igate duty, the smaller model will work as properly because the larger one. By adjusting the resonant frequencies of the loops, there's also no purpose why it couldn't even be used for the Japanese forty kHz JJY or the German 77.5 kHz DFC77 signal as well! The reply is a bit tricky as any system involving probably involving radio frequencies is topic to FCC rules. For personal use, one would take care to avoid doing one thing that could trigger interference and contemplating the frequencies concerned, one might fairly be assured that a system like this can be usually incapable of doing so - even when it have been to malfunction in some bizarre manner!

Being that this was a trendy constructing of steel and reinforced concrete development, and because it was stuffed with digital devices corresponding to computer systems, fluorescent lights, and so on. neither of these receivers ever managed to get a ok sign to synchronize themselves to the 60 kHz time sign being transmitted from Fort Collins, Colorado by the NIST station, WWVB although the signal from that station here in the Salt Lake area is sort of strong. I've often been asked "Where can I get a system like this"? Were a system like this to be actively marketed and offered then it would be incumbent on the producer/vendor to assure correct FCC compliance - a course of that can be each costly and arduous! In cases like this the X-3.Zero is the better Cable. This may occasionally just not do for actually long Cables (just like the 5m I will want sooner or later for the hyperlink from my Pre to my Mono-block Amp's (underneath improvement). I didn't need the antenna to be tunable since it should operate on a single spot frequency (10.149 MHz) completely. Top: The rooftop-mounted 60 kHz shielded loop antenna. A loop antenna has a "determine 8" pattern and thus has two nulls and a degree of directionality.

The 10-foot piece of pipe is lower into two pieces after which rejoined with a pipe cross-tee, allowing the antenna to be disassembled to fit into the trunk of a automotive. I've now setteled down to 2 fundamental Versions of this Cable. The calculator referred to above is now downloadable from this web site. I calculated the required capacitance required to resonate the loop at 10.15 MHz using the calculator referred to above, and got down to create an affordable fastened-worth capacitor with 4-5 KV breakdown voltage. I'm measuring the Cables Capacitance. It isn't very hygienical (don't tell individuals that truly purchase these Cables yeah?) however the one dependable stripper I've found are my teeth. Since I've written the last two Interconnect Articles I had each some suggestions from you, the Readers and have made a couple of extra Cables myself. All but one Cable where variations of the XLO Geometry, which I have decided to call X-Cable (as a result of crossing conductors making many, copper conductor meter cable many X's down the size of the Cable). Solder one finish to one of the holes in the flange of a coax socket. The quantity denotes the space between the start and finish of one full flip around the core.