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A friend was contracted to do some wiring in a local hospital.
They were to order Belcon 1506A as part would run through an air vent system. Some fool in purchasing decided to go with 1505A. Same cable except it ain't plenium rated. The supplier wouldn't take it back, and they had no storage space so he was given, as in legal transferr with documentation. The fool in purchasing lost his job. Must be hard to be on the street when you are 58. My friend had about as much use for this cable as I do a poke in the eye. So he gave it to me. This is GOOD, very good cable loss at 1500MHz is only 9.3dB/100'. Last weekend we helped a mutual handicaped friend put up a better scanner and SW antenna. We used a laptop,my PRC1000 and compared the 1506A with standard and low loss 50 Ohm coaxes. Pretty day, good fun. While we climbed like monkeys he fixed on hell of a supper. First cookout of the new year and the food was GREAT! With an NIB older radioshack diskcone, the one without the vertical stinger, and a pasternack PL-259 to "F" female adaptor we tried some tests. The 1505A was better, lower loss and greater noise rejection, then any other cable we tried. Just for grins I used 50' of 50 Ohm Heliax and while it was slightly better, heliax is are and expensive. We also tried some of Beldons normal CATV coax and it was at least as good as the 50 ohm and was a lot cheaper. His coax run is 50' from the antenna to the ground (AKA "static" block. With a ~10 run to his radio desk. He lives about 20 miles from Lexington KY, so we used distant (50 miles)NOAA stations and the UKPD/LFFFUCG fire trunking system. This isn't a state of the art installation. My friend isn't interested in trying to receive weak distant signals. HE just wants to keep up with his old comrades. We could listen to PD/FR and aero comms from a 50 mile radius. He is tickled pink. Perhaps his ineterest will grow. And perhaps not. The foil and copper braid offer much better shielding, going from 96% for braid, to to 100% for braid foil. This helps keep noise from your computers from entering the signal path after the coax is in your radio room. I have an older Contura 40MHz? laptop that the LCD screen is NASTY. I mainly use it for my DeLorme GPS but it will control my PRC1000 very nicely. We learned that routing of coax can be more important then most radio users think. By passing the recieve coax across the front of the LCD screen , standard braid only coax started letting RF noise into the receiver. I used a "bunch"(10 on each side) of ferrite beads to keep the RF from traveling up the braid's outer surface. Without the beads, even with the coax well away from the PC, we got a few slight birdies. This even happened with the heliax. For SW CATV worked as well as any other cable I have ever tried. Our friend is on a limited income, long term disability insurance, and it was nice to be able to do a first class install without breaking his piggy bank. While 1505A is clearly overkill it works very nice. This left more money for his radios. I have loaned him my PCR1000 untill his radios arrive. And it was nice to use a TV A/B switch to allow him to change from the diskcone to the 100' longwire. And yea the 100' longwire overloads the PCR1000 on HF, but a simple el-cheapo radioshack varaible attenuator, with F in and out takes care of that. And yes a 100' wire beats a diskcone for HF reception. Period! I think the average SWL and scanner user is missing a bet by not investigating CATV coax and "F" fittings. There are good weather proof male "F" fittings that are much easier, and cheaper!, to make good connections with then BNC. Good CATV coax is much less expensive then similar 50 Ohm stuff because they make so much more of the CATV cable. Ground blocks are inexpensive and will allow one to easily meet the NEC requirement to ground the outer conductor on coax. And this stuff is made to stand up to bad weatehr. Cable TV companies and Direct TV want their installs to be as trouble free as they can make them. If you talk with your local cable installer you can often get odd lengths of CATV for the taking. I admit usng the 1505A was overkill , but why not, we ahd it. Terry |
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