Using Coax From Old Sat. dish
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| Jan 28th 2012, 18:34 | |
W1FLTotal Topics: 0 Total Posts: 0 |
I still have the in-ground coax leading to the mast of an old 12' sat. TV dish. There are 4 separate coax cables in this special cable set. My question: Can I use the coax to feed a 50 ohm vertical antenna, and would there be any benefit in linking the 4 coax cables in parallel from the tuner to the antenna ? Thanks very much, 73 Andy Knittle W1FL |
| Jan 28th 2012, 22:36 | |
aa5xoTotal Topics: 0 Total Posts: 0 |
First of all, old coax is usually bad because of water seeping into it. Check it out with a RF/SWR Analyzer such as the MFJ-269. You have to make sure the coax is good. You can measure the loss directly with the SWR Analyzer. Leave the coax open at the far end, connect the MFJ-269 to the near-end, Move the menu to coax-loss and measure at the appropriate frequency. Secondly, connecting four coax cables in parallel reduces the input impedance to 1/4th of one cable. Maybe for a vertical, that would be a good thing. However, if the input impedance to the antenna is truly 50 ohms, feeding the antenna with 75 ohm coax is perfectly fine. 73, Stan Kozlowitz AA5XO |
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