I had not heard that different metals are more or less effective at RF shielding at higher frequencies. I had heard of Mu metal that's used in audio recording studios to specifically block 60Hz hum.
I tried to find info about what attenuation different materials offer and all I could find was this: http://www.ramayes.com/EMI_RF_Foil_Shielding.htm According to them the shielding (up to 10GHz) is about the same for the different materials. I know all the amps and splitters the cable company uses up on their poles are aluminum. Greg On Dec 3, 2009, at 12:41 AM, MDK wrote: > Aluminum is moderately effective at attenuating microwave rf. > > Steel is needed to dampen EMP (from lightning strikes). > > > > -------------------------------------------------- > From: "Josh Luthman" <j...@imaginenetworksllc.com> > Sent: Wednesday, December 02, 2009 8:35 PM > To: "WISPA General List" <wireless@wispa.org> > Subject: Re: [WISPA] Multiple Radio cards in an enclosure > >> Does die cast aluminum count as metal in this case? Do you normally use >> steel if not? >> >> I use these: >> http://quicklinkwireless.com/Itemdesc.asp?ic=DCE-H-LG-2&eq=&Tp= >> >> Josh Luthman >> Office: 937-552-2340 >> Direct: 937-552-2343 >> 1100 Wayne St >> Suite 1337 >> Troy, OH 45373 >> >> "The secret to creativity is knowing how to hide your sources." >> --- Albert Einstein >> >> >> On Wed, Dec 2, 2009 at 10:30 PM, Marlon K. Schafer >> <o...@odessaoffice.com>wrote: >> >>> I've given up on this. There is just too much cross talk. I put all >>> radios >>> in the same band in their own METAL enclosure nowadays. I try to keep >>> them >>> at least 3 or 6 feet apart too. Life is much much nicer. >>> marlon >>> >>> ----- Original Message ----- >>> From: "Mike" <m...@aweiowa.com> >>> To: "WISPA General List" <wireless@wispa.org> >>> Sent: Wednesday, December 02, 2009 8:13 AM >>> Subject: [WISPA] Multiple Radio cards in an enclosure >>> >>> >>>> Since I am probably one of the veterans called out yesterday for my >>>> messaging etiquette, I am changing the subject. >>>> >>>> I am interested in the multiple radios in an enclosure idea. I do >>>> have a couple with 5.8 and 2.4 gear in the same box, but have been >>>> afraid to put cards in the same band in the same case. >>>> >>>> The foil spacer you put between cards Bob, do you then ground it to >>>> create a sort of Faraday shield? I know the XRx cards do a good job >>>> of shielding if you attach the pigtail. >>>> >>>> How about the receive sensitivity on the 411 cards? Has that been an >>>> issue? I think the XR cards have better specs. Wouldn't having >>>> multiple 411 cards in the same box possibly have desense issues too? >>>> >>>> Mike >>>> >>>> >>>> At 09:41 AM 12/2/2009, you wrote: >>>>> Forgot to add, if you're concerned with any RF collisions inside the >>>>> box, >>>>> the other thing I talked about earlier, having just 3 411 cards in >>>>> their >>>>> own >>>>> box at the sector then running Cat5 to transparent bridge the 411's to >>>>> a >>>>> central RouterOS device would take any of that issue totally away. >>> That's >>>>> one that I'm doing just to do it, basically. Was an idea from someone >>>>> a >>>>> couple of months ago. (I actually listen to you guys) Had a 600a >>>>> doing >>>>> nothing and some 411 cards "so why not play?" was my thinking. >>>>> >>>>> Bob- >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >>>>> Behalf Of Mike >>>>> Sent: Wednesday, December 02, 2009 9:48 AM >>>>> To: WISPA General List >>>>> Subject: Re: [WISPA] Sectors >>>>> >>>>> Have you had any issues with putting 3 radio cards in the same >>>>> spectrum in the same box? I've thought about that but wondered if >>>>> there would be desense issues where one transmitting desensitizes >>>>> another one listening. >>>>> >>>>> >>>>> At 08:38 AM 12/2/2009, you wrote: >>>>>> Yep, looks like you're hitting the wall. We aren't lucky enough to >>> push >>>>>> 3 >>>>>> meg here, the most is usually 1 so again, all depends on your >>>>>> customer >>>>> base. >>>>>> >>>>>> I'd say if you already have 35 on that one AP, just splitting it into >>>>>> 2 >>>>>> 180 >>>>>> degree sectors will just cost you cash as soon as you gain a few more >>>>>> customers. You already have 35 pulling it down, sounds like if you >>> just >>>>>> do >>>>>> 2 180's, if split evenly (and it never will be) that would put you to >>>>>> where >>>>>> you probably want to be for smooth delivery but not much room for >>>>>> more >>>>>> growth. I'd go with 3 120's and a 433AH with 3 cards on it, one per >>>>> sector. >>>>>> I have a few like that and it works fine for what I do but again, I >>> only >>>>>> dole out 1mb per sub typically. I've also been upgrading some of my >>>>>> remote >>>>>> AP's to one 433AH with only one radio installed and an Omni. The >>>>>> anticipated upgrade path is to just add a sector or 2 and radio card >>>>>> as >>>>>> needed to the point where I have 3 sectors. Keeping the Omni of >>>>>> course >>>>>> until the third sector is needed. That's something someone already >>>>>> suggested doing and I like the economics of it. >>>>>> >>>>>> Bob- >>>>>> >>>>>> >>>>>> >>>>>> -----Original Message----- >>>>>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >>> On >>>>>> Behalf Of Jason Hensley >>>>>> Sent: Wednesday, December 02, 2009 9:26 AM >>>>>> To: 'WISPA General List' >>>>>> Subject: Re: [WISPA] Sectors >>>>>> >>>>>> Max 3meg - b only mode on this particular AP. Most are still able to >>>>>> get >>>>>> that, but we're seeing a decline on how many can pull 3meg. At peak >>>>>> times, >>>>>> we've seen it to where users aren't able to get much over 1meg, but >>>>>> that's >>>>>> not happening very often right now. >>>>>> >>>>>> >>>>>> >>>>>> -----Original Message----- >>>>>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >>> On >>>>>> Behalf Of Robert West >>>>>> Sent: Wednesday, December 02, 2009 8:23 AM >>>>>> To: 'WISPA General List' >>>>>> Subject: Re: [WISPA] Sectors >>>>>> >>>>>> Yeah, how much bandwidth are you passing to those 35 customers, >>>>>> Jason? >>>>> Just >>>>>> curious. >>>>>> >>>>>> Bob- >>>>>> >>>>>> >>>>>> >>>>>> -----Original Message----- >>>>>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >>> On >>>>>> Behalf Of os10ru...@gmail.com >>>>>> Sent: Wednesday, December 02, 2009 9:10 AM >>>>>> To: WISPA General List >>>>>> Subject: Re: [WISPA] Sectors >>>>>> >>>>>> Do you think you're hitting the limit of 802.11b/g or is it the lack >>>>>> of >>>>>> horsepower on the AP's CPU? >>>>>> >>>>>> Greg >>>>>> On Dec 2, 2009, at 8:33 AM, Jason Hensley wrote: >>>>>> >>>>>>> On this same subject, would it be better to put up 3 individual >>> AP's, >>>>>>> or >>>>>>> would something like the Deliberant Quad work well if the issue is >>> AP >>>>>>> overload. I have an AP that has 35 subscribers right now. We've >>>>>>> seen a >>>>>>> performance drop on it and are considering sectoring. >>>>>>> >>>>>>> Any thoughts on a dual (or quad) radio on a single board vs >>>>>>> multiple >>>>>> boards >>>>>>> with single radios? >>>>>>> >>>>>>> >>>>>>> >>>>>>> -----Original Message----- >>>>>>> From: wireless-boun...@wispa.org >>>>>>> [mailto:wireless-boun...@wispa.org >>> ] >>>>>>> On >>>>>>> Behalf Of Rick Harnish >>>>>>> Sent: Wednesday, December 02, 2009 6:28 AM >>>>>>> To: 'WISPA General List' >>>>>>> Subject: Re: [WISPA] Sectors >>>>>>> >>>>>>> Mark, >>>>>>> >>>>>>> If I remember right, you are in Missouri. I was looking for the >>>>> strength >>>>>> of >>>>>>> your omni. We have had good success with 9 db omni's in the >>>>>>> Indiana >>>>>>> farmland. When we need to sectorize but the market capacity is >>>>>>> not >>>>>>> that >>>>>>> high, we often go to (2) 180 Superpass 9 db sectors. We have had >>>>>>> good >>>>>> luck >>>>>>> with them over the years. They improve our signal to existing >>>>>>> clients >>>>> and >>>>>>> enable affordable expansion in rural areas. If the market will >>>>>>> justify >>>>> 3 >>>>>>> sectors, I would go that way though. >>>>>>> >>>>>>> Many of our Wireless POPs are pico-cells and we try to limit our >>>>> salesmen >>>>>> to >>>>>>> a 6 mile diameter around the tower. Although, we can often go >>>>>>> farther, >>>>> we >>>>>>> try to stay inside these guidelines when possible. To achieve a >>>>>>> high >>>>>> density >>>>>>> of broadcast stations, many locations are needed. Luckily, we are >>>>>>> well >>>>>>> established in our area and have most of these sites already in >>>>> operation. >>>>>>> Your mileage may vary given your topology and broadcast site >>> density. >>>>>>> >>>>>>> Rick Harnish >>>>>>> >>>>>>>> -----Original Message----- >>>>>>>> From: wireless-boun...@wispa.org [mailto: >>> wireless-boun...@wispa.org] >>>>>>>> On >>>>>>>> Behalf Of Mark McElvy >>>>>>>> Sent: Tuesday, December 01, 2009 10:51 PM >>>>>>>> To: WISPA General List >>>>>>>> Subject: [WISPA] Sectors >>>>>>>> >>>>>>>> I am running 2.4 HPOL It has taken about 1.5 yrs to grow this AP >>>>>>>> to >>>>>>>> 32 >>>>>>>> subs. >>>>>>>> >>>>>>>> -----Original Message----- >>>>>>>> From: wireless-boun...@wispa.org [mailto: >>> wireless-boun...@wispa.org] >>>>>>>> On >>>>>>>> Behalf Of 3-dB Networks >>>>>>>> Sent: Tuesday, December 01, 2009 9:37 PM >>>>>>>> To: 'WISPA General List' >>>>>>>> Subject: Re: [WISPA] Sectors >>>>>>>> >>>>>>>> What frequency band and polarization? >>>>>>>> >>>>>>>> I would also strongly consider your reasoning for moving from the >>>>>>>> Omni >>>>>>>> to >>>>>>>> the sectors. If it is because your AP is overloaded so you need >>>>>>>> to >>>>>>>> offload >>>>>>>> some, 3 AP's might be attractive for future proofing sakes. >>>>>>>> >>>>>>>> Daniel White >>>>>>>> 3-dB Networks >>>>>>>> http://www.3dbnetworks.com >>>>>>>> >>>>>>>> >>>>>>>> -----Original Message----- >>>>>>>> From: wireless-boun...@wispa.org [mailto: >>> wireless-boun...@wispa.org] >>>>>>>> On >>>>>>>> Behalf Of Mark McElvy >>>>>>>> Sent: Tuesday, December 01, 2009 8:29 PM >>>>>>>> To: WISPA General List >>>>>>>> Subject: Re: [WISPA] Sectors >>>>>>>> >>>>>>>> 9db >>>>>>>> >>>>>>>> -----Original Message----- >>>>>>>> From: wireless-boun...@wispa.org [mailto: >>> wireless-boun...@wispa.org] >>>>>>>> On >>>>>>>> Behalf Of Rick Harnish >>>>>>>> Sent: Tuesday, December 01, 2009 7:42 PM >>>>>>>> To: 'WISPA General List' >>>>>>>> Subject: Re: [WISPA] Sectors >>>>>>>> >>>>>>>> What size omni are you using? >>>>>>>> >>>>>>>>> -----Original Message----- >>>>>>>>> From: wireless-boun...@wispa.org >>>>>>>>> [mailto:wireless-boun...@wispa.org] >>>>>>>> On >>>>>>>>> Behalf Of Josh Luthman >>>>>>>>> Sent: Tuesday, December 01, 2009 7:59 PM >>>>>>>>> To: WISPA General List >>>>>>>>> Subject: Re: [WISPA] Sectors >>>>>>>>> >>>>>>>>> That is the general suggestion - two 120s. That one guy that >>>>>>>>> does >>>>>>>>> antenna design said so :) >>>>>>>>> >>>>>>>>> You will get some less coverage then three 120s but at the cost >>>>>>>>> of >>>>>>>> the >>>>>>>>> extra radio/antenna it isn't cost efficient. >>>>>>>>> >>>>>>>>> On 12/1/09, Mark McElvy <mmce...@accubak.com> wrote: >>>>>>>>>> I need to sector a tower that currently is an omni. I don't >>>>>>>>>> really >>>>>>>>> want >>>>>>>>>> to go to 3x 120's but find it hard to find 180's and have heard >>>>>>>> they >>>>>>>>>> don't tend to work great. I have also heard 2x 120's will work, >>>>>>>>>> any >>>>>>>>>> comments? >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Mark >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>> >>> --------------------------------------------------------------------- >>>>>>>>> ----------- >>>>>>>>>> WISPA Wants You! 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