repeater coax cable recommendation

[FCM]

Installing a gmrs repeater. cable run is 35 ft . Output is 35 watts..what should I use for cable? Can I use cinta 600?

Thanks

[Will]

Most repeater pro's do NOT use any foil/braid types of coax. The foil/braid type cables are prone to duplex noise and passive intermod generation.

Heilax is the best.

[KG4INW]

For that distance, Andrew (CommScope) 1/4" Superflex, FSJ1-50A, should work nicely.

[Astro Spectra]

Too thin, easily damaged, and installers often make a hash of fitting the connectors. I recommend the 3/8" cable and check to see if a plenum or riser cable jacket is needed.

[FMROB]

So, we use 9914 often to make a jumper between the repeater cabinet and lighting arrestors, maybe less than 10' in most cases. I have never run into the issues of noise in duplexed systems, however the runs have been short. I would also assume, since 9914 style cable is used as jumpers on many duplexers themselves, this problem is isolated to longer runs or outdoor (wind exposed) installations?

I would have no issue in using 1/2 heliax, however if it is not terminating into a fixed rack or cabinet, people moving the cable and cabinet worries me. Stressing the connectors on the hardline is much easier than a 9914 type cable.

Thanks, Rob

[escomm]

wow all this overbuilding of a gmrs repeater

come on guys

superflex is extremely lossy (4db/100ft at 450mhz!) and heliax is overpriced for such a project

LMR400 or LMR600 is fine for 35 feet

you can put my name on that

[FCM]

Thanks everyone for your input. Im going to go with the lmr 600. The cost is less than half of the heliax.
Thanks again to the forum !

Frank

[Bill_G]

wow all this overbuilding of a gmrs repeater

come on guys

superflex is extremely lossy (4db/100ft at 450mhz!) and heliax is overpriced for such a project

LMR400 or LMR600 is fine for 35 feet

you can put my name on that

+1

And I see no benefit going with LMR600 for this band at this length. I'd stick to LMR400.

[wavetar]

For a run that short, good old RG214 would be perfectly fine, and no LMR foil/braid noise worries.

[escomm]

For a run that short, good old RG214 would be perfectly fine, and no LMR foil/braid noise worries.

Other than the price going in the complete opposite direction, you have a point. RG214 is more expensive than heliax.. and even lossier.

[escomm]

And btw, if LMR400 is good enough for short runs of public safety BDA applications at 700 & 800MHz, which it is, then it's good enough for any GMRS, amateur, or even commercial repeater... that's not at an RF dense site. All this nonsense is overengineering and a separation of the user from his money

[Bill_G]

Every time I run into so called noisy lmr cable, it's the connectors. Either poor workmanship, or poor mating. I had one recently with the braid trimmed off entirely with a tiny bit of the black outer coating trapped in the crimp. This was supposedly a pre-made bagged cable from the interwebs.

[escomm]

Is this a good time to piss and moan about DIN connectors and AVA and other types of garbage Andrew is shoving down LMR's throat

[Bill_G]

I like how the connectors are so interchangeable between AVA5 and LDF5. Two thumbs up!!!!!!!

(/sarcasm)

[KG4INW]

Well, what's superflex good for then?!

[Bill_G]

Well, what's superflex good for then?!

For people that can afford it, it's great for indoor cables. Some sites require it.

[escomm]

Well, what's superflex good for then?!

RX jumper from a multicoupler to a receiver

[tsunami_australia]

I got some HFSC 12D (pretty sure that's the model code) 1/2" coax dirt cheap last month at a radio field day and it has been EXCEPTIONAL here on a 33m run for both VHF and UHF. I run from the antenna to just behind the radios where I have a 10-20cm RG58 patch to go from the N plugs terminating the 1/2" to MPL plugs for the GM300UHF/M120VHF radios. As the radios are both affixed to a shelf the coax comes up behind the shelf off the floor and the plugs sit just a few cm above the shelf some 6 or so cm from the rear of the radios.