Maximum Coax Length?

[Mustang 131]

350 foot plus of lmr 600 with lc connectors. Bullet proof.

 

[freecell]

That's a pretty lossy line at 27-30 mhz.

 

[groundwire]

160 feet will be about 1.2 dB loss, not much choice if that is the distance to bridge.
Get a good antenna up, see forum here, and it will work fine.
3dB loss is just noticable, so don't sweat.
Is there lower loss cable out there? yes, but the price and connectors will be a LOT more expensive.
When the antenna is good i dont see chance on interference, good brand/quality coax can last decades.

Yea, connectors are the killer. I run lmr600, cost? No big deal. The 50 ohm 10kw connectors for it? $$$$$ ouch! I almost fell over when i saw the price...

 

[freecell]

Mustang 131 wrote: "350 foot plus of lmr 600". 3dB. of line loss attenuation results in a 50% reduction in power delivered to the antenna load. 350 "plus" feet of LMR600 results in a 25% reduction in power delivered to the antenna load. These losses will be higher depending upon values of inductive or capacitive reactance, impedance mismatch and any ground return losses present at the load.

https://www.w4rp.com/ref/coax.html

 

[DainBramage]

Mustang 131 wrote: "350 foot plus of lmr 600". 3dB. of line loss ...These losses will be higher depending upon values of inductive or capacitive reactance, impedance mismatch and any ground return losses present at the load.

https://www.w4rp.com/ref/coax.html

Exactly, all coax loss is measured @ 50 ohms, unless otherwise stated.

 

[Big Kahuna]

If you want to bury the coax I've been very impressed with the Davis RF Bury Flex. It lived underground for years and when I dug it up and washed it off the jacket still looked excellent. I should mention it also worked great

 

[Rwb]

Better grade coax,from point A to point B. But huge long runs will show loss. But thats part of radioing
TEST,IS THIS THING ON? SQUEEEEL CAN YOU HEAR ME NOW SQUEEEEL TEST?
lester roadhog n his cadallac cowboys

 

[freecell]

Grandpap wrote, "I have not decided on an antenna yet, but about the only place I have to set up my tower gives me a run of about 160 feet from my shack...."

assuming a perfect load, (R=50, jX=0) 160 ft. of LMR400 @ 27.385 (channel 38) will have an amount of line loss due to attenuation of 1.030 dB.. with 100 watts input to the line, 78.9W/% will be delivered to the load (antenna) while 21.1W/% will be dissipated in the line.

as to what part of the 78.9W/% will actually be radiated by the antenna depends on the radiation efficiency of the antenna.

any deviation from perfect load conditions above will result in increased power losses.

 

[164 northern cal]

Bringing any feed line thru the attic or any part of a home without a way too disconnect it outside of the home during severe weather is a Bad Idea.I have seen first hand what happens to the coax from a lightning strike & it could very easily result in your home burning down.Lighting should not be taken lightly.Give it the respect that it deserves & don't lose your home or life for a radio.

SIX-SHOOTER

Good Wisdom