RG213 as extension cord

[dubir]

Dear all
please dvise if i can use 30meter RG213 cable to connect my Icom R20 to handled antenna that i put at second floor roof.

Thanks !

 

[radiofan1]

Everything is 50 ohm, right? So sure ya can.

 

[prcguy]

What frequency range? at 800MHz you will have about 7dB loss which is quite a lot.
prcguy

 

[k9rzz]

Oh, I read 'extension cord' and was thinking 110VAC.Yeah, we did that in college with RG8. We needed some power up on the 4th floor roof so we wired up the RG8 feedline. "Git 'er done!" LOL (Oh, can it, we were VERY careful!)

 

[kb2vxa]

Being plain old RG-8U solid poly dielectric type it's not so good when you're looking at 30m of the stuff. You'll lose half the signal at 200MHz and at 800MHz you'll end up with less than a quarter of what went in.

I wouldn't recommend it for AC mains wiring but don't put anything past those crazy college kids. Braiding several lengths together like a heavy rope I managed to tow a 3,458lb 1957 Chevy with it 40 miles or so before the lead driver got a little frisky and we had to stop and splice it back together. Come to think of it we were "that age" at the time... hmmm.

 

[dubir]

Yes it is 50 ohm
i won't get overload on my R20?

 

[mrweather]

Unless there's a high-powered transmitter antenna near your antenna, you won't overload the R20.

 

[kb2vxa]

It has already been settled that you're looking at the wrong cable for that long a run so why are you not looking for lower loss cable? Of course you won't overload the R20 with a big attenuator between it and a less than unity gain antenna... sheesh! One thing that hasn't been mentioned but should be, a hand held antenna sucks raw eggs to begin with, it is only used for portable because of its small size. Aside from low loss cable you need an antenna right for the job unless you want to end up with less than you started with.

 

[dubir]

ok

It has already been settled that you're looking at the wrong cable for that long a run so why are you not looking for lower loss cable? Of course you won't overload the R20 with a big attenuator between it and a less than unity gain antenna... sheesh! One thing that hasn't been mentioned but should be, a hand held antenna sucks raw eggs to begin with, it is only used for portable because of its small size. Aside from low loss cable you need an antenna right for the job unless you want to end up with less than you started with.

so what would you do insted?
can you be more specific?
thanks

 

[ResQguy]

Might want to also explain why you need 90 feet of cable to go to the second story... Why not trim it down a bit?