Blocking "RF" signals

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kevinware

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Louisville, KY
I work in a healthcare environment and we are installing a wireless scanner system for scanning barcodes. There is a huge tower less then five miles from our hospital providing wireless Internet to the public. The problem is we are receiving "RF" interference through the windows of the hospital in the 2GHz range and we are trying to come up with a way to block or reflect this interference. We have put a mylar film on the windows and that has knocked the signal down a little but we need to take it back a little more. I have seen some information on a ground system called a "Halo Ground system". Can I get some opinions and ideals on the Halo ground system and how this problem could be handled?
 
Re: Blocking "RF" signals

If your bar code reader is radio, what frequency is it? I'd guess it's pretty far away from 2 GHz. I'm not trying to say your system doesn't work too good. But does it?
 
Re: Blocking "RF" signals

I don't even know how relevant this is. But.

I can't even pick up a decent TV signal 20 miles away with the transmitter and receiver tuned to the same frequency.

I'm thinking your scanner needs some signal descrimination. I'd be talking to the manufacturer.
 
Re: Blocking "RF" signals

I have designed numerous "halo grounds" for years in the radio/telephone industry. Unfortunately it is not going to help you out. The "halo ground" is used to attenuate the EMP from tower strikes.
 
Re: Blocking "RF" signals

Interference seems to be a common problem with 2Ghz equipment. I've heard about cordless phones, wireless internet and microwave ovens all causing problems.

I've had people with the "bigger is better" mentality tell me how 2Ghz cordless phones have to be better then complain they can't use them next to the microwave. Others relate how their cordless phone knocks out their internet.

I would get with the manufacturer on this one. It's not unusual for a system like yours to have to coexist with other services on those frequencies and it's totally unreasonable for the responsibility to be on you to provide an RF shielded environment, if that's even possible.

You paid for it and it doesn't work, make them take care of it!

-Hal
 
Re: Blocking "RF" signals

There are firms the specialize in sheilding. In Washington DC theses firms do quite well (imagine that). I would suggest you do a web search looking for firms the design skiff rooms. If you have problems contact me by email, I will give you a list of firms I have worked with. I am not affilated with any of these firms.
 
Re: Blocking "RF" signals

This is ridiculous. Those firms do well in Washington because of security concerns. For what you would pay for their "services" you could buy SEVERAL barcode scanning systems from another company that actually work.

-Hal
 
Re: Blocking "RF" signals

You paid for it and it doesn't work, make them take care of it!
Click to expand...
I have to agree 100%. I think its unlikely that the internet tower is keeping the bar code readers from working. Just my opinion.

Steve
 
Re: Blocking "RF" signals

This is ridiculous. Those firms do well in Washington because of security concerns. For what you would pay for their "services" you could buy SEVERAL barcode scanning systems from another company that actually work.


Let me see this is ridiculous, electricians are nothing more than glorified labors, for what you pay electricians you could hire a couple of laborers and buy the material yourself, it'll work.


The point is EVERYONE does a job because there is a need for them. Also know as supply and demand.
Sorry if the concept bothers you.
 
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