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looking for rare high-Z low-capacitance coax - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


gvisser
Post subject: looking for rare high-Z low-capacitance coax Posted: Wed Oct 14, 2009 4:58 pm

Lieutenant

Joined: Wed Oct 14, 2009 4:49 pm
Posts: 3
For a physics research application at Indiana University (Bloomington, Indiana), I am in urgent need of a short length (5 feet is enough) of low capacitance coaxial cable.
The ideal type would be RG-114 (M17/47) which is 6.5 pF/foot, Z0=185 Ohm, air/polyethylene.
However, anything <= 12.5 pF/foot would be very useful.
Does anyone have a line on where I can purchase (new or surplus) or otherwise get something like this? Please respond if you do... Thanks!


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flyingbrit
Post subject: Re: looking for rare high-Z low-capacitance coaxPosted: Mon Oct 26, 2009 3:37 pm

Lieutenant

Joined: Mon Oct 26, 2009 3:32 pm
Posts: 1
The typical car radio replacement whip antenna will have about 6 feet of RG-62A. At 93 ohms and 13.6 pF/ft it is not quite what you want but is easily available at your local NAPA store.


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gvisser
Post subject: Re: looking for rare high-Z low-capacitance coaxPosted: Tue Oct 27, 2009 10:04 am

Lieutenant

Joined: Wed Oct 14, 2009 4:49 pm
Posts: 3
Thanks - yes this is true and I'm aware of RG-62(A) and we have some of that around the lab. Really what I mean is that I'm seeking something better (lower capacitance) than RG-62. I have no idea if RG-114 ever was really made? But if there is any lead where to get something like that, or other special low-capacitance cable, I'd still like to hear about it. [I am also aware of a 125 Ohm foam polyethylene cable - 9.5 pF/ft - made (supposedly) by CommScope, but have had zero success in trying to get some of it. I suspect although they have a datasheet on the web, they don't really make it?]


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yendori
Post subject: Re: looking for rare high-Z low-capacitance coaxPosted: Wed Oct 28, 2009 5:46 am

General


Joined: Thu Sep 25, 2003 1:19 am
Posts: 50
Location: texarcana
Have you tried here?

http://www.awcwire.com/ProductSpec.aspx?id=RG114-Coaxial-Cable

Rod


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gvisser
Post subject: Re: looking for rare high-Z low-capacitance coaxPosted: Fri Oct 30, 2009 4:49 pm

Lieutenant

Joined: Wed Oct 14, 2009 4:49 pm
Posts: 3
Hello Rod,
Thanks for the lead! I had not found that one. Indeed they do have the stuff in stock, now it is only a matter of the minimum order $$ but that is for now my project manager to worry about.

In case anyone out there has a short length (5 feet is really enough) I'd certainly appreciate to hear from you. But I'm glad to have found a vendor that we can get it from. Thanks again!



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