thanks guys for your input! ok, forget about thin and supple. i need 50
ohm impedance coax at 900mhz into a uniden scanner(bnc connector) with a
15 foot run. what coax of any size is commonly available that would be
suitable?

"Jim" wrote in message
...
thanks guys for your input! ok, forget about thin and supple. i need 50
ohm impedance coax at 900mhz into a uniden scanner(bnc connector) with a
15 foot run. what coax of any size is commonly available that would be
suitable?

Hi Jim

I wonder why you would not use the RG-6 as suggested by Dave Oldridge.
Even Home Depot has the cable and the BNCs for it.
RG-6 is good transmission line at 900 MHz.

I submit that nothing in the system from the antenna all the way to the
receiver will be 50 ohms, no matter what transmission line you choose.

Jerry

Jim wrote:
thanks guys for your input! ok, forget about thin and supple. i need 50
ohm impedance coax at 900mhz into a uniden scanner(bnc connector) with a
15 foot run. what coax of any size is commonly available that would be
suitable?

LMR-1700 looks pretty good on the loss charts. It's about
$10 per foot, 1.67 inch diameter - not sure about the BNC
connector :-)
--
73, Cecil http://www.qsl.net/w5dxp

I suggest you look at a BNC cable assembly available From AAA RF Products of
San Clemente, CA The AAA1003-180 Cable Assembly uses RG213/U cable with BNC
male connectors, lenght is 15 feet and loss at 900 MHz would be about 1.6
dB. Cost about $30. See www.aaarfproducts.com for email & phone #

Murray, W6KRC




"Cecil Moore" wrote in message
om...
Jim wrote:
thanks guys for your input! ok, forget about thin and supple. i need 50
ohm impedance coax at 900mhz into a uniden scanner(bnc connector) with a
15 foot run. what coax of any size is commonly available that would be
suitable?

LMR-1700 looks pretty good on the loss charts. It's about
$10 per foot, 1.67 inch diameter - not sure about the BNC
connector :-)
--
73, Cecil http://www.qsl.net/w5dxp

If you need a nice low-loss coax for 900 MHz, there's not much better
than a 1" outside diameter cable with a 0.3" diameter inner conductor.
Or something like that.

If you cannot find such a line then the best thing to do is re-design
the whole system such that you don't need it.

=========================================

"Jim" wrote in message
...
thanks guys for your input! ok, forget about thin and supple. i need 50
ohm impedance coax at 900mhz into a uniden scanner(bnc connector) with a
15 foot run. what coax of any size is commonly available that would be
suitable?

If you insist on 50 Ohm skinny cable, get the LMR240. Loss for 15 feet will
be 1.15 db. I believe HRO sells it. About the same diameter as RG59. There
is also an LMR240UF, which is very flexible. The UF has slightly more loss,
but at 15 feet you won't see it. $10 should get you 15 feet. We used this
stuff at 2 GHz. The regular 240 has a solid center conductor, the UF is
stranded. You might have trouble getting a BNC connector on the non-UF.

Tam/WB2TT

"Jim" bravely wrote to "All" (13 Nov 05 13:51:06)
--- on the heady topic of " coax for 900mhz?"

Ji From: (Jim)
Ji Xref: core-easynews rec.radio.amateur.antenna:220026

Ji thanks guys for your input! ok, forget about thin and supple. i need
Ji 50 ohm impedance coax at 900mhz into a uniden scanner(bnc connector)
Ji with a 15 foot run. what coax of any size is commonly available that
Ji would be suitable?

Listen, these nice guys are all BS'ing you. Remember that cable is
rated in dB/1,000ft, so that with only 15 of cable -- ANY -- will be
about the same. You will probably have more loss in the connectors!

A*s*i*m*o*v

.... Everyone hates me because I'm paranoid.

Huh? All my charts list loss per one hundred feet...however, unless he
needs every last bit of signal, 15 feet of RG-58 would be OK...see:
http://bwcecom.belden.com/Catalog/Te...cteristics.pdf

Scott

Asimov wrote:
"Jim" bravely wrote to "All" (13 Nov 05 13:51:06)
--- on the heady topic of " coax for 900mhz?"

Ji From: (Jim)
Ji Xref: core-easynews rec.radio.amateur.antenna:220026

Ji thanks guys for your input! ok, forget about thin and supple. i need
Ji 50 ohm impedance coax at 900mhz into a uniden scanner(bnc connector)
Ji with a 15 foot run. what coax of any size is commonly available that
Ji would be suitable?

Listen, these nice guys are all BS'ing you. Remember that cable is
rated in dB/1,000ft, so that with only 15 of cable -- ANY -- will be
about the same. You will probably have more loss in the connectors!

A*s*i*m*o*v

... Everyone hates me because I'm paranoid.