LMR-400 Coax Cable
 

needing to replace my rg58. is LMR-400 the new recommened coax these days
or rg6?


thanks

LMR-400 Coax Cable
 

"Frank346" wrote in
:


"randiR" wrote in message
. ..
needing to replace my rg58. is LMR-400 the new recommened coax these
days or rg6?

It's not possible to make a recommendation since you've not told us
anything about the application.

What frequencies do you want to monitor?

How long is the cable?

Why do you think the RG-58/U needs to be replaced?

RG-6/U is just a generic designation. There are many variants
including the ever popular but unnecessary quad shield. If you select
a particular brand and type number, Belden 9116 for example, it will
be possible to look up loss figures and do a comparison.

Besides being expensive LMR-400 is 10mm in diameter and not as easy to
work with as RG-6 or RG-58.




thanks. I was doing some research at scannermaster and saw LMR-400 and
RG-58, but didn't see RG-6. My current setup over 20 years old and living
in Iowa I would imagine it is close to its lifespan. Plus, when I chose
RG58 back then, I was under impression it was considered best cable for
the job. Probabably is a 40' run to the antenna (which will also be
replaced) which is about 30' high. Main interest here is mil air. I will
be splitting it to work on a Pro-2004 and BC250D. Which I realize will
introduce some loss. I am using a Radio shack amplifier to compensate for
some of the loss.

LMR-400 Coax Cable
 

gentlemen, that you for advice. most helpful.

LMR-400 Coax Cable
 

If you're not transmitting, you don't need a low loss coax.
mini 8 will work or 58/u or rg8, whatever blows your skirt up.

LMR-400 Coax Cable
 

In article , says...
If you're not transmitting, you don't need a low loss coax.
mini 8 will work or 58/u or rg8, whatever blows your skirt up.




HUH?

BDK

LMR-400 Coax Cable
 

"Sarge" wrote in message
...
If you're not transmitting, you don't need a low loss coax.
mini 8 will work or 58/u or rg8, whatever blows your skirt up.
Right- if you don't care about Signal/Noise- then use anything you want.But
if you want to preserve the best possible S/N, then use the lowest loss
coax you can afford.
Dale

LMR-400 Coax Cable
 

"Res" wrote in message
vpf.arg...
On Wed, 13 Feb 2008, Sarge wrote:

If you're not transmitting, you don't need a low loss coax.

errr wrong, that db loss works both ways

I replaced 15 meters of 58 with 213 and weak noisy stations are now like
they're next door, or if you like a readability of 2, now up
to R5, I had other stations of R1 that are now R4, and heap of new stuff I
never new existed before.


--
Cheers
Res

Geeez how long of a run? I think your 58 was bad.

LMR-400 Coax Cable
 

"Dale Parfitt" wrote in message
news:K6Qsj.387$ph.169@trnddc06...

"Sarge" wrote in message
...
If you're not transmitting, you don't need a low loss coax.
mini 8 will work or 58/u or rg8, whatever blows your skirt up.
Right- if you don't care about Signal/Noise- then use anything you
want.But if you want to preserve the best possible S/N, then use the
lowest loss coax you can afford.
Dale

you sure don't need to lay out money for LMR400. Just going from rg58 to rg8
or mini 8 would do it.

LMR-400 Coax Cable
 

"Sarge" wrote in message
...

"Dale Parfitt" wrote in message
news:K6Qsj.387$ph.169@trnddc06...

"Sarge" wrote in message
...
If you're not transmitting, you don't need a low loss coax.
mini 8 will work or 58/u or rg8, whatever blows your skirt up.
Right- if you don't care about Signal/Noise- then use anything you
want.But if you want to preserve the best possible S/N, then use the
lowest loss coax you can afford.
Dale

you sure don't need to lay out money for LMR400. Just going from rg58 to
rg8 or mini 8 would do it.

RG58 100ft @ 900mhz = 14.5 db loss (significant)
Mini 8 100ft @900mhz = 8.8 db loss (thats about a 6db gain and that will
make a difference.
LMR400 100ft @ 900mhz = 4.1 db loss ( thats a 4db improvement over mini 8)
Everyone knows that the first 6db gain or loss will make a difference that
you'll see and hear. However, 4 db you won't see or hear. Therefore there is
no reason to go the extra cost plus have to work with LMR400 which is a bit
unwieldy . Now on my ham gear vhf/uhf, yes I use LMR400 because it is that
much better for transmit. It helps on both ends.
A scanner is only a recvr. Plus I seriously doubt anyone is using a 100ft
coax run for a scanner. On my stuff I use 130ft run.
Got a 50ft run? cut those figures in half.

Thats all I meant in my post. LMR400 just is not going to do that much over
rg8 or mini8 or 8x to justify the hassle and expense over a short run of any
other coax.

Sarge W5SRG