pvanstry Posted August 17, 2015 Report Share Posted August 17, 2015 Hi guys, what is the most flexible coaxial antenna cable ( 50 ohm ) and if possible low loss? thanks Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted August 17, 2015 Report Share Posted August 17, 2015 How long are your cables? If you have shorter runs there are more options for thinner more flexable cables. Quote Link to comment Share on other sites More sharing options...
pvanstry Posted August 17, 2015 Author Report Share Posted August 17, 2015 No more then 7'. Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted August 18, 2015 Report Share Posted August 18, 2015 I use this and it's pretty flexable for a 50ohm coax https://www.tessco.com/products/displayProductInfo.do?sku=48546 Quote Link to comment Share on other sites More sharing options...
Karl Wasserman Posted August 18, 2015 Report Share Posted August 18, 2015 +1 on the RG8X. Nice and flexible, even in the dead of winter, and we get 50' with impunity on a pair of Yagi-Udas. Also, Go Habs Go. Karl Quote Link to comment Share on other sites More sharing options...
jerryray Posted August 22, 2015 Report Share Posted August 22, 2015 Just a FYI So you lose 5.5 db for 50 feet, RG213 would be 3.3 db, 9913 would be 1.8 db Quote Link to comment Share on other sites More sharing options...
soundtrane Posted August 22, 2015 Report Share Posted August 22, 2015 No more then 7'. Gordon Moore - Lectro Pres had a perspective on NOT using RG58 but 75 ohm cable with much lesser loss per foot. and it's flexible... on facebook... there's some LMR ultraflex cable, google for it... Quote Link to comment Share on other sites More sharing options...
Wyatt Tuzo Posted August 22, 2015 Report Share Posted August 22, 2015 For very short runs (on the cart or in the bag), I'm generally happy with rg174... It's somewhat lossy, but I find it negligible at these lengths. Can't get any more flexible. Quote Link to comment Share on other sites More sharing options...
Johnny Karlsson Posted August 27, 2019 Report Share Posted August 27, 2019 On 8/22/2015 at 8:35 AM, soundtrane said: Gordon Moore - Lectro Pres had a perspective on NOT using RG58 but 75 ohm cable with much lesser loss per foot. and it's flexible... on facebook... there's some LMR ultraflex cable, google for it... I know it's an old thread, but this caught my eye while researching different coax cables for antennas. Is this correct? I have always thought that 50 Ohm cable is the way to go....?? On that note, say one was to run a 100ft antenna cable with a powered distro, would a 75 Ohm cable be ok to use? Quote Link to comment Share on other sites More sharing options...
drpro Posted August 27, 2019 Report Share Posted August 27, 2019 RG-316 is a bit better choice the RG-174. It is double shielded and lower loss at the UHF bands we use. For bag use it works well about .5db loss for a meter length of coax. Quote Link to comment Share on other sites More sharing options...
Johnny Karlsson Posted August 28, 2019 Report Share Posted August 28, 2019 Thanks drpro . But those are both 50 ohm cables. I should have clarified that what I was specifically wondering about in the above quote was the statement that it’s better to use a 75 ohm cable to achieve less signal loss. In my mind, I would think more resistance would equal more loss...? But, if Gordon says so, I would assume that I’m wrong. Or am I simply missing something? Quote Link to comment Share on other sites More sharing options...
karlw Posted August 28, 2019 Report Share Posted August 28, 2019 Here's a post from Henry Cohen (one of the RF gurus we know - but more in the entertainment/live side of the business) regarding using 75 Ohm coax for wireless mic systems: http://www.alexfernie.com/Blog/files/fb2da73c042405c1cfad17e91b1e51f8-50.php -Karl Quote Link to comment Share on other sites More sharing options...
Johnny Karlsson Posted August 28, 2019 Report Share Posted August 28, 2019 5 minutes ago, karlw said: Here's a post from Henry Cohen (one of the RF gurus we know - but more in the entertainment/live side of the business) regarding using 75 Ohm coax for wireless mic systems: http://www.alexfernie.com/Blog/files/fb2da73c042405c1cfad17e91b1e51f8-50.php -Karl Thanks, Karl !! Quote Link to comment Share on other sites More sharing options...
soundtrane Posted August 29, 2019 Report Share Posted August 29, 2019 8 hours ago, karlw said: Here's a post from Henry Cohen (one of the RF gurus we know - but more in the entertainment/live side of the business) regarding using 75 Ohm coax for wireless mic systems: http://www.alexfernie.com/Blog/files/fb2da73c042405c1cfad17e91b1e51f8-50.php -Karl Surely this applies to short runs? Quote Link to comment Share on other sites More sharing options...
Matthew Steel Posted September 2, 2019 Report Share Posted September 2, 2019 This paper was helpful to me and addresses (at least to a small degree) the long run/short run nature of the question: http://audiosystemsgroup.com/Which_Coax_for_Wireless_Mics.pdf In short, the loss from mismatch is a one-time loss, where cable loss accumulates over distance. Thus, for short runs the mismatch loss is more significant (but still quite small). But for long runs, definitely the cable loss far outweighs the mismatch loss. Quote Link to comment Share on other sites More sharing options...
Johnny Karlsson Posted September 2, 2019 Report Share Posted September 2, 2019 Found this signal loss calculator. You can plug in type of cable / length / frequency and see the loss for those specifics. https://www.timesmicrowave.com/calculator/?Product=RG-8X&RunLength=100&Frequency=550 Quote Link to comment Share on other sites More sharing options...
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