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Sneaking RF Into a Case... - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Mike_From_Plano
Post subject: Sneaking RF into a case... Posted: Mon Apr 27, 2009 10:44 pm

Captain

Joined: Mon Apr 20, 2009 2:04 pm
Posts: 14
Hello Again,

I was just wondering if anyone had a suggestion for sneaking RF through a chassis wall and into a load without leaking it all over the interior of the chassis.

Essentially, I want to transport DC plus up to 37dBm of 30MHz - 10GHz, through a connector, into a chassis and then into a box that functions as a dummy load / bias Tee to pull the DC out.

My concern is getting the RF from chassis wall to the box containing the Tee without interfering with unshielded equipment in the chassis.

Any ideas?

Thanks,
Mike


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RDO-RF
Post subject: Re: Sneaking RF into a case...Posted: Tue Apr 28, 2009 8:17 am

Captain


Joined: Wed Apr 08, 2009 7:53 am
Posts: 12
Is the chassis IP rated?

If it is an IP65 chassis, then just make a drilling on the bottom face of the chassis (big enough so the cable connector can pass though) and connect the cable into the insider load box.. perhaps you could put a plastic device on the chassis wall hole(I don´t know how you call it) so you don´t damage the cable.

And be careful, perhaps it is not a good idea to have unshielded RF inside of the chassis.

Perhaps this is not ideal for every application, this is common for IP65 outdoor high power cellular repeaters..
Hope this helps you.

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nubbage
Post subject: Re: Sneaking RF into a case...Posted: Wed Apr 29, 2009 7:02 am

General


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Simplistically, because I don't have your precise mechanical config, I would mount a good quality SMA bulkhead female to female connector on the outside box, and something similar on the inside box, then attach an SMA male to SMA male semi-rigid coax line between the two. That gets the DC plus 30-10000 MHz to the inside of the inner box with a screening factor of about 100dB.
Or am I missing something that makes that impossible?

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