At 700 MHz, you really want hard line.  I'd go with Andrew/ComScope LDF4-50A
which is also known as half inch Heliax.  Tessco sells it.  Also, you
definitely don't want to use PL259's, AKA UHF connectors.  You want at least
N connectors.  They are available for all sorts of cable, including
LDF4-50A.

HTH

Alan/KD7GC




Alan R. Downing
Phoenix, AZ

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Scott Gillen
Sent: Wednesday, June 18, 2014 12:53 AM
To: [log in to unmask]
Subject: Re: Replacing my coax cable

Any one know the frequency response of rg313?  I'm looking at it for
wireles=
s microphone receiving antennas in  the 700MHz band in a TV studio.  Would
u=
se rg58 but the runs are between 15-20 meters and I am told it will be to
lo=
ssy. It's possible  we could end up with units in the 2GHz band.=20

Scott

Sent from my iPhone

On 18/06/2014, at 3:15 AM, Steve Forst <[log in to unmask]> wrote:

> Mike,
>=20
> Nice theory on  the numbering system, but not right.  RG-213 is  the=20
> same size as RG-8, which is kind of the  "standard" size.  Both of=20
> these, and a bunch of others in the RG-8 catagory, are just under a
half=20=

> inch diameter.   I think .405 inch.  A regular PL-259 connector
threads=20=

> onto the jacket without any adapter.
>=20
> For what it's worth, several years ago I redid the station with Davis
RF=20=

> Bury-Flex, which is a low loss, direct buryable RG-8 size with a super=20
> tough jacket made of  poly something or other.
>=20
> Davis also carries a wide variety of other cables, like Andrews.
They=20=

> are in New England.  Coax can be heavy, don't know if shortening the=20
> distance would save any on shipping compared to  getting from
somewhere=20=

> else in the States.
>=20
> davisrf.com
>=20
> 73, Steve KW3A
>=20
> On 6/17/2014 10:11 AM, Michael Ryan wrote:
>> Hi all:
>>=20
>> As I got to order some tubes from RF Parts, I'm looking at ordering some
r=
eplacement coax as well as the prices look pretty good.
>> The problem is, I'm not sure on what to order as the site has such a
vari=
ety from Andrew Heliax to LMR600 and everything in between.
>> I need a direct berry, low loss to replace my RG-213 and I'm wondering
if=
 the LMR240 will do?
>> I'm thinking that the LMR240 is a little larger than the 213 and that's
w=
hat those numbers mean. 213 =3D .213 of an inch, 240 =3D .24 of and inch
and=
 so on. Therefore the LMR400 or 600 would be a pretty thick cable and may
re=
quire me to drill a larger hole to thread it. LOL
>> My current PL-259s fit the exit hole of the shack.
>>=20
>> 73:
>> Mike VO1AX
>>=20
>>=20
>>=20
>=20