- Which coax is better? - 2 Updates
| Ralph Mowery <rmowery28146@earthlink.net>: Mar 15 10:17AM -0400 In article <p56dncFkePkdORbBnZ2dnUU7-QHNnZ2d@giganews.com>, jdangus@att.net says... > It doesn't make much if any difference. > Don't let people wind you up about impedance matching on receive > antennas. For receiving the impedance will not make any difference as the receiver impedance varies all over the place over a wide range of frequencies. Just as Jeff says. I would use the RG-6 TV type as the losses are usually lower for coax around 1/4 inch in diameter and the cost is very low. Some have even gotten short ( 50 to 100 feet) pieces for free from the cable TV companies. The main problem will be getting a good connection. You need the proper crimp connectors and tool as the shield is aluminum. For me, the next best would be some RG-8X. It is 50 ohm, but the shield and center conductor is copper so you can solder to it with no problem. The rg-8X is about the same size as the rg-6 TV coax. Uhnless the distance is less than about 25 feet I would stay away from the rg-58 that is slightly smaller in diameter. |
| Jeff Liebermann <jeffl@cruzio.com>: Mar 15 09:37AM -0700 >CB and low power ham radios use one type. RG-58c/u >TV antennas use the other. RG-6/u (usually good stuff) RG-59a/u (which is garbage) >Both coax is about the same diameter and looks alike on the outside. I use RG-6/u with F-connectors for EVERYTHING, whether it's 50 or 75 ohms. I also have a fair collection of Type-F to BNC or PL-259. The mismatch loss is negligible: <https://www.qsl.net/n9zia/wireless/75_ohm_hardline.html> Please note that there are variations in RG-6/u quality varying from Radio Shack junk to "satellite TV" grade with lower losses at >1GHz frequencies. Some variations are more flexible than others, some have a UV resistant jacket, and some use CCA (copper clad alumunium) which is cheap junk. Caveat emptor. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 2 updates in 1 topic"
Post a Comment