I think most of the audio stuff uses BNC style connecters?
wireless mikes in a studio with 15 or 20 meters of feed line to an antenna
doesn't seem logical to me.
If it were me, I'd place the wireless receiver with it's antenna close to
where the mikes will be used. Then run longer audio cable runs back to the
processing equipment.
Sounds to me like you want to place the receivers with the rest of the audio
gear and put antennas close to where the mikes will be used instead. This
isn't necesarily the best way. Because you'll be using line level audio out
from the receiver, you can get away with fairly long runs of audio cable
with little signal loss. If you are going to try and run hardline for the
antennas, not only will the cable be large and bulky, but it'll be
expensive.
Not only that, at 700MHZ, you'll have loss on almost any feed line, as
compared with a long audio cable run where you'll have very little loss.
just my thoughts.
73
Colin, V A6BKX
--------------------------------------------------
From: "Alan R. Downing" <[log in to unmask]>
Sent: Wednesday, June 18, 2014 8:51 AM
To: <[log in to unmask]>
Subject: Re: Replacing my coax cable
> 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
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