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Antenna cable

 
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Brad Harper

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Since: Jul 30, 2004
Posts: 138



(Msg. 1) Posted: Thu Sep 22, 2005 9:51 pm
Post subject: Antenna cable
Archived from groups: rec>arts>movies>production>sound (more info?)

Has anyone found 4 pair 50 ohm coax?

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Philip Perkins

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Since: Dec 09, 2004
Posts: 757



(Msg. 2) Posted: Fri Sep 23, 2005 8:30 am
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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What a lovely idea! Does this exist? Is it
fat and stiff or relatively managable like "mini-8"?
How about 2-pair?

Philip Perkins

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Cleve Massey

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Since: Jun 25, 2003
Posts: 85



(Msg. 3) Posted: Sun Sep 25, 2005 1:23 pm
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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in article 0eidnSqctpcF8K7eRVn-qw.TakeThisOut@comcast.com, Brad Harper at
bradharperOMITTHIS.TakeThisOut@comcat.net wrote on 9/22/05 9:51 PM:

> Has anyone found 4 pair 50 ohm coax?
>
>
Canare makes two pair, three, four, and six! All in the MARKERTEK catalog.

And don't be bummed by the fact that it is 75ohm...that won't mean much
unless you are transmitting thru the cable!!!
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Philip Perkins

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Since: Dec 09, 2004
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(Msg. 4) Posted: Sun Sep 25, 2005 7:30 pm
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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Yeah, sorry, but the 75 ohm thing DOES make a diff with UHF antennas.
I learned this the hard way. Also, more than 30' or so of a cable like
"mini 8" has very noticeable loss of signal strength as well. Lectro
said they didn't sell a dual pair 50 ohm cable (Belden) because it
would be too stiff to use.

Philip Perkins
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Gtrew

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Since: Feb 25, 2005
Posts: 242



(Msg. 5) Posted: Sun Sep 25, 2005 8:03 pm
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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Actually, it makes relatively little difference when the power is very
low (like received signals), but considerably more difference with
higher power such as when used as a transmitter cable.

I probalby wouldn't plan on it, but 75ohm video cable can be used as a
receiver antenna cable in a pinch (just pay attention to the length).

Glen Trew
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William Sarokin

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Since: Dec 12, 2003
Posts: 340



(Msg. 6) Posted: Mon Sep 26, 2005 2:21 am
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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I beg to differ on this one Cleve (Larry Fisher jump in here please) but
when you are talking received signals in the millionth of a volt range, any
impedence mismatch between the antenna and the receiver has a serious
effect.
Billy

"Cleve Massey" <cmassey26 RemoveThis @earthlink.net> wrote in message
news:BF5C0EF4.1D1F2%cmassey26@earthlink.net...
> in article 0eidnSqctpcF8K7eRVn-qw RemoveThis @comcast.com, Brad Harper at
> bradharperOMITTHIS RemoveThis @comcat.net wrote on 9/22/05 9:51 PM:
>
>> Has anyone found 4 pair 50 ohm coax?
>>
>>
> Canare makes two pair, three, four, and six! All in the MARKERTEK
> catalog.
>
> And don't be bummed by the fact that it is 75ohm...that won't mean much
> unless you are transmitting thru the cable!!!
>
>
>
>
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Philip Perkins

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Since: Dec 09, 2004
Posts: 757



(Msg. 7) Posted: Mon Sep 26, 2005 8:19 am
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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But those multicore cables mentioned above were 75 ohm. Has anyone
seen the same thing in 50 ohm?
It must exist somewhere.

Philip Perkins
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Brad Harper

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Since: Jul 30, 2004
Posts: 138



(Msg. 8) Posted: Mon Sep 26, 2005 9:26 am
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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This would be for my antenna mast so around 10' total; two for receive and
two for transmit. I could just use tech flex, but as long as I was remaking
them I figured I would try to find 4 pair.

Brad


"Gtrew" <glen.TakeThisOut@trewaudio.com> wrote in message
news:1127703798.798322.262320@f14g2000cwb.googlegroups.com...
> Actually, it makes relatively little difference when the power is very
> low (like received signals), but considerably more difference with
> higher power such as when used as a transmitter cable.
>
> I probalby wouldn't plan on it, but 75ohm video cable can be used as a
> receiver antenna cable in a pinch (just pay attention to the length).
>
> Glen Trew
>
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Brad Harper

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Since: Jul 30, 2004
Posts: 138



(Msg. 9) Posted: Mon Sep 26, 2005 10:32 am
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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That's my question.

Brad


"Philip Perkins" <spamiser DeleteThis @yahoo.com> wrote in message
news:1127747991.615704.56840@g14g2000cwa.googlegroups.com...
> But those multicore cables mentioned above were 75 ohm. Has anyone
> seen the same thing in 50 ohm?
> It must exist somewhere.
>
> Philip Perkins
>
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nydanceflm

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Since: Sep 26, 2005
Posts: 1



(Msg. 10) Posted: Mon Sep 26, 2005 6:33 pm
Post subject: Re: Antenna cable -- Markertek warning! [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

I would be very cautious about buying anything from Markertek. I've
done business with them a number of times in the past, and in almost
every case, their products, service and attitude were quite poor.

For example: once I ordered a patch bay and some short patch cables.
Only the bay arrived. I called them and was told the cables were
backordered and would take at least two weeks to ship. I told them to
cancel that part of the order, and credit my card as I would look
locally in the stores here in NYC for the cables. I found the cables
the next day. The very following day, the cables from Markertek
arrived. Long story short, they refused to take them back. I was stuck
with two sets which I didn't need.

Worse example: I ordered a set of about a dozen or so custom patch
cables -- they would be making them up to their "high standards." When
they arrived, three were missing the spring strain relief on the phone
plug end. Just rushed and sloppy workmanship. They refused to replace
them.

Horrendous example: When I was setting up field production kit, I
ordered a $1,300 Shure mixer. Actually needed it for a shoot I was
leaving on trip for in several days. They had a "new" unit in stock.
Had it sent FedEx next day. While using it, noticed that one of the
three channel pots was loose compared to others. Also seemed strange to
me that part of case Velcro was already mounted on mixer. When I got
back from trip, I examined contents of carton (was too rushed to get on
plane earlier), and noticed paperwork between Shure and Markertek
definitively showing this mixer had been repaired by Shure (apparently
dropped by previous owner). When confronted with this Markertek denied
it was a used/repaired unit. I was livid, but couldn't get them to
budge from their position that they sold me new mixer. Tried to get
Shure to take it in, replace knob (and pot) and warrant it as new. They
refused, saying I had bought a previously owned mixer (I suspected
Shure might have been in cahoots with Markertek to sell rehabed
equipment as new, and have never bought a single Shure product again!).
What I should have done is brought Markertek and Shure to court. But I
was much too busy working at the time, and the mixer seemed to work,
although that first channel was a little noisy once in a while (don't
have unit any longer).

I found Markertek's customer service to be useless. Could never get
intelligent, responsible person to respond to my complaints. Could
never get name of supervisor, company executives, etc. Once ran into
several of their smart-ass reps at trade show who almost laughed at me
when I told them this story.

Bottom line: I've never done business again with them. I realize their
catalog lists much obscure gear, etc., but if couldn't find it
elsewhere, I'd do without out. If they were the only supply house in
this biz, I'd go raise goats!

Beware of Markertek!
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Philip Perkins

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Since: Dec 09, 2004
Posts: 757



(Msg. 11) Posted: Mon Sep 26, 2005 6:44 pm
Post subject: Re: Antenna cable -- Markertek warning! [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Shure has always been very accomodating with me, esp. with portable
mixers. They first repaired and then swapped out 3 FP32a mixers for
little or no money, and I ended up with brand new Fp 33s.

Philip Perkins
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Philip Perkins

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Since: Dec 09, 2004
Posts: 757



(Msg. 12) Posted: Mon Sep 26, 2005 6:47 pm
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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Well, that's mighty confusing. So how do I calculate what lengths of
RG59 would work for me when I'm using wireless in 3 different blocks on
a single wideband antenna? Sometimes 10 ft might be ok, but most of
the time I need to get the antenna at least 30 ft closer to the talent
than I can get the cart, if not farther.

Philip Perkins
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G. John Garrett, C.A.S

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Since: Jun 10, 2004
Posts: 979



(Msg. 13) Posted: Mon Sep 26, 2005 7:44 pm
Post subject: Re: Antenna cable [Login to view extended thread Info.]
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I always thought that was why god invented spi-wrap and cable ties ;-p

John


Brad Harper wrote:

> That's my question.
>
> Brad
>
>
> "Philip Perkins" <spamiser RemoveThis @yahoo.com> wrote in message
> news:1127747991.615704.56840@g14g2000cwa.googlegroups.com...
>
>>But those multicore cables mentioned above were 75 ohm. Has anyone
>>seen the same thing in 50 ohm?
>>It must exist somewhere.
>>
>>Philip Perkins
>>
>
>
>
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G. John Garrett, C.A.S

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Since: Jun 10, 2004
Posts: 979



(Msg. 14) Posted: Mon Sep 26, 2005 7:46 pm
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Larry Fisher wrote:



>
> The reason that transmitter cables ARE critical as to impedance is
> that voltages are high and sometimes close to the voltage or current
> rating of the cable. Using the wrong impedance can cause local "hot"
> spots voltage or current wise and destroy the cable. This is not a
> problem with our "mighty" 100 mW transmitters but a definite
> consideration with 10 kW+ broadcast transmitters.
> Best Regards,
> Larry Fisher
> Lectrosonics

Plus you have to use more matching components at the tower base/phasor, and it
can make getting the common point impedence to 50 ohms a little tricker...

John

/ducking
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Greg Glazier

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Since: Sep 11, 2005
Posts: 71



(Msg. 15) Posted: Mon Sep 26, 2005 8:56 pm
Post subject: Re: Antenna cable -- Markertek warning! [Login to view extended thread Info.]
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nydanceflm RemoveThis @aol.com wrote:
> I would be very cautious about buying anything from Markertek. I've
> done business with them a number of times in the past, and in almost
> every case, their products, service and attitude were quite poor.
>
> Bottom line: I've never done business again with them. I realize their
> catalog lists much obscure gear, etc., but if couldn't find it
> elsewhere, I'd do without out. If they were the only supply house in
> this biz, I'd go raise goats!
>
> Beware of Markertek!

I couldn't disagree more. I've found them to be fast, courteous, and
give me some of the best prices anywhere, beating other resellers
(including B&H) by as much as 20%. Of course, I may buy a lot more from
them than you do, and I do get preferred pricing.

How can you say their products are poor when they're essentially just a
reseller? They are usualy my first call, along with Trew Audio.

--
g2
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