Re: [WISPA] looking for feedback on Exalt - ExploreAir
I remember seeing that there was a vendor other than Exalt that had a 1 gig real throughput single radio setup. It was even mentioned in one of these Exalt threads. However, my searching magic simply can't find it. Ideas? - Mike Hammett Intelligent Computing Solutions http://www.ics-il.com On 4/12/2011 9:35 PM, lakel...@gbcx.net wrote: */Great product. Works like a dream. No sales fluff in that stuff /**/ /**/-B- /**/ /*/Sent via DROID on Verizon Wireless/ -Original message- *From: *Mike Hammett wispawirel...@ics-il.net* To: *WISPA General List wireless@wispa.org* Sent: *Wed, Apr 13, 2011 02:21:15 GMT+00:00* Subject: *Re: [WISPA] looking for feedback on Exalt - ExploreAir Which session? - Mike Hammett Intelligent Computing Solutions http://www.ics-il.com On 9/4/2010 10:37 AM, Rick Harnish wrote: Marco, I don't have experience but there is a PowerPoint presentation on the wiki from the regional meeting. Rick Marco Coelhowrote: Exalt - ExploreAir http://www.exaltcom.com/ExploreAir-all-outdoor-licensed.aspx Is anyone using these in a production environment that want's to share performance and reliability data? Marco -- Marco C. Coelho Argon Technologies Inc. POB 875 Greenville, TX 75403-0875 903-455-5036 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] looking for feedback on Exalt - ExploreAir
Bridgewave does as well. WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] looking for feedback on Exalt - ExploreAir
That's what I thought, but they only had their 60 and 80 GHz products on their site. - Mike Hammett Intelligent Computing Solutions http://www.ics-il.com On 4/13/2011 6:17 AM, can...@believewireless.net wrote: Bridgewave does as well. WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
[WISPA] Ethernet Cable for FM Tower Install
We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
http://www.wlan1.com/product_p/cat5e-shielded.htm --- Dennis Burgess, Mikrotik Certified Trainer Link Technologies, Inc -- Mikrotik WISP Support Services Office: 314-735-0270 Website: http://www.linktechs.net LIVE On-Line Mikrotik Training - Author of Learn RouterOS -Original Message- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of can...@believewireless.net Sent: April 13, 2011 8:36 AM To: wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] looking for feedback on Exalt - ExploreAir
On Apr 13, 2011, at 4:15 AM, Mike Hammett wrote: I remember seeing that there was a vendor other than Exalt that had a 1 gig real throughput single radio setup. It was even mentioned in one of these Exalt threads. However, my searching magic simply can't find it. Trango can apparently achieve 1Gbps over a single system using payload compression. www.trangosys.com/products/point-to-point-wireless-backhaul/elite-licensed-wireless.shtml I have not used the Elite series radios, so I cannot verify claimed throughput myself. Although Trango did send me a RFC2544 report of IPv6 forwarding performance through the Elite radios with payload compression on. The tests with 512-1518 frame sizes show between 955Mbps - 984Mbps full duplex. We run the Giga series throughout most of our network (Apex, GigaPlus, GigaPro) and are very happy with the products. -- Blake Covarrubias WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] looking for feedback on Exalt - ExploreAir
I remember hearing that was only on the high freq side. And that at 11ghz with payload compression they were seeing about 2:1 (so like ~500Mb/s@11ghz). Also heard that the radio will compress, Then compare it to the uncompressed packet. And that if it didn't gain anything, It would just drop the compressed packet and send the uncompressed packet. I found that incredible for a radio that boasts such a high PPS rate. Nick Olsen Network Operations (855) FLSPEED x106 From: Blake Covarrubias bl...@beamspeed.com Sent: Wednesday, April 13, 2011 11:36 AM To: WISPA General List wireless@wispa.org Subject: Re: [WISPA] looking for feedback on Exalt - ExploreAir On Apr 13, 2011, at 4:15 AM, Mike Hammett wrote: I remember seeing that there was a vendor other than Exalt that had a 1 gig real throughput single radio setup. It was even mentioned in one of these Exalt threads. However, my searching magic simply can't find it. Trango can apparently achieve 1Gbps over a single system using payload compression. www.trangosys.com/products/point-to-point-wireless-backhaul/elite-licensed-w ireless.shtml I have not used the Elite series radios, so I cannot verify claimed throughput myself. Although Trango did send me a RFC2544 report of IPv6 forwarding performance through the Elite radios with payload compression on. The tests with 512-1518 frame sizes show between 955Mbps - 984Mbps full duplex. We run the Giga series throughout most of our network (Apex, GigaPlus, GigaPro) and are very happy with the products. -- Blake Covarrubias WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
I'm assuming that's single shielded and not double shielded. On Wed, Apr 13, 2011 at 9:57 AM, Dennis Burgess dmburg...@linktechs.net wrote: http://www.wlan1.com/product_p/cat5e-shielded.htm --- Dennis Burgess, Mikrotik Certified Trainer Link Technologies, Inc -- Mikrotik WISP Support Services Office: 314-735-0270 Website: http://www.linktechs.net LIVE On-Line Mikrotik Training - Author of Learn RouterOS -Original Message- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of can...@believewireless.net Sent: April 13, 2011 8:36 AM To: wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
On Wed, Apr 13, 2011 at 08:35, can...@believewireless.net p...@believewireless.net wrote: We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Ubiqiti's Level 2 ToughCable might work for you. Each twisted pair is shielded, with a divider in the cable, then the whole cable has a second layer of shielding. Works well on normal tower runs, but I've never put it anywhere close to a transmitter that powerful, so I can't vouch for it in that environment. David Smith MVN.net WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Question about hosting client's POS merchant account for credit card processing
Thanks everyone for your responses re: serving clients' credit card readers; they were very helpful. A related question I asked on another listserv: does anyone use lightweight VPN solutions in their CPE to create tunnels from the client's location, thru your backhaul, back to your wired/fibered uplink? That is, if you indulge some paranoia and not trust sending potentially plaintext credit card traffic as-is over the same wireless link as other clients' traffic, and/or you don't fully trust WPA2 to keep out snooping by 3rd parties, do you build a VPN tunnel from the card reader back to whatever box manages your fiber link? I received some interesting suggestions for very lightweight VPN, specifically tinc and N2N, which both work on OpenWRT. N2N is apparently lightweight enough (tho can't support large bandwidth) that folks reported it running it directly on access points like Ubnt Nanostation M's. On Mon, Apr 11, 2011 at 7:14 PM, Ben West b...@gowasabi.net wrote: I am curious if anyone has experience providing wireless service to small businesses who use a POS credit card system. My own chats with various small biz owners here in St. Louis suggests that their merchant account providers tend to expect a twisted-pair phone line and/or dedicated DSL/cable, no wireless. I imagine this may vary depending on who actually provides the merchant account, but has anyone received feedback from such providers about their expectations for serving the credit card machines wireless? E.g. must you use dedicated, encrypted wireless links (as common sense would suggest), and/or VPNs, or must the POS machine sit on a dedicated LAN, etc? Thanks. P.S. By POS I mean Point of Sale, to avoid any confusion. ;) -- Ben West http://gowasabi.net b...@gowasabi.net -- Ben West http://gowasabi.net b...@gowasabi.net WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Question about hosting client's POS merchant account for credit card processing
network aware CC terminals do not encrypt their own traffic? On 4/13/11 1:30 PM, Ben West wrote: Thanks everyone for your responses re: serving clients' credit card readers; they were very helpful. A related question I asked on another listserv: does anyone use lightweight VPN solutions in their CPE to create tunnels from the client's location, thru your backhaul, back to your wired/fibered uplink? That is, if you indulge some paranoia and not trust sending potentially plaintext credit card traffic as-is over the same wireless link as other clients' traffic, and/or you don't fully trust WPA2 to keep out snooping by 3rd parties, do you build a VPN tunnel from the card reader back to whatever box manages your fiber link? I received some interesting suggestions for very lightweight VPN, specifically tinc and N2N, which both work on OpenWRT. N2N is apparently lightweight enough (tho can't support large bandwidth) that folks reported it running it directly on access points like Ubnt Nanostation M's. On Mon, Apr 11, 2011 at 7:14 PM, Ben West b...@gowasabi.net mailto:b...@gowasabi.net wrote: I am curious if anyone has experience providing wireless service to small businesses who use a POS credit card system. My own chats with various small biz owners here in St. Louis suggests that their merchant account providers tend to expect a twisted-pair phone line and/or dedicated DSL/cable, no wireless. I imagine this may vary depending on who actually provides the merchant account, but has anyone received feedback from such providers about their expectations for serving the credit card machines wireless? E.g. must you use dedicated, encrypted wireless links (as common sense would suggest), and/or VPNs, or must the POS machine sit on a dedicated LAN, etc? Thanks. P.S. By POS I mean Point of Sale, to avoid any confusion. ;) -- Ben West http://gowasabi.net b...@gowasabi.net mailto:b...@gowasabi.net -- Ben West http://gowasabi.net b...@gowasabi.net mailto:b...@gowasabi.net WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Question about hosting client's POS merchant account for credit card processing
MikroTik RB750's at the client and maybe a RB493 at the head end? Instant VPN tunnel. - Jerry From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Ben West Sent: Wednesday, April 13, 2011 11:31 AM To: wireless@wispa.org Subject: Re: [WISPA] Question about hosting client's POS merchant account for credit card processing Thanks everyone for your responses re: serving clients' credit card readers; they were very helpful. A related question I asked on another listserv: does anyone use lightweight VPN solutions in their CPE to create tunnels from the client's location, thru your backhaul, back to your wired/fibered uplink? That is, if you indulge some paranoia and not trust sending potentially plaintext credit card traffic as-is over the same wireless link as other clients' traffic, and/or you don't fully trust WPA2 to keep out snooping by 3rd parties, do you build a VPN tunnel from the card reader back to whatever box manages your fiber link? I received some interesting suggestions for very lightweight VPN, specifically tinc and N2N, which both work on OpenWRT. N2N is apparently lightweight enough (tho can't support large bandwidth) that folks reported it running it directly on access points like Ubnt Nanostation M's. On Mon, Apr 11, 2011 at 7:14 PM, Ben West b...@gowasabi.netmailto:b...@gowasabi.net wrote: I am curious if anyone has experience providing wireless service to small businesses who use a POS credit card system. My own chats with various small biz owners here in St. Louis suggests that their merchant account providers tend to expect a twisted-pair phone line and/or dedicated DSL/cable, no wireless. I imagine this may vary depending on who actually provides the merchant account, but has anyone received feedback from such providers about their expectations for serving the credit card machines wireless? E.g. must you use dedicated, encrypted wireless links (as common sense would suggest), and/or VPNs, or must the POS machine sit on a dedicated LAN, etc? Thanks. P.S. By POS I mean Point of Sale, to avoid any confusion. ;) -- Ben West http://gowasabi.net b...@gowasabi.netmailto:b...@gowasabi.net -- Ben West http://gowasabi.net b...@gowasabi.netmailto:b...@gowasabi.net No virus found in this message. Checked by AVG - www.avg.comhttp://www.avg.com Version: 10.0.1209 / Virus Database: 1500/3571 - Release Date: 04/13/11 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Question about hosting client's POS merchant account for credit card processing
Hi Ben, You can slice this in as many ways as you like... However if you want to keep it simple and effective... Here is the rundown If they are using the correct processor, who is able to do these transactions over IP / via the Internet, then you don't have to worry about any of this..(all communication is encrypted). And here another interesting gem. Out of all the different ways to do this, and all the different processors / merchant account / transaction clearing house etc.etc. the Best one for ISP's WISP's are the folks at IP Pay... because the take care of the transaction end to end, and actually keep life simple for everyone involved, the Merchant as well as the ISP. The nice un-recognized bonus is all of this is that, typically IP Pay will reduce a Merchant's Credit Card Processing fees and charges (nice bonus for Merchants) and they are willing to 'share' a portion of the Credit Card Processing fees / charges they make with the ISP/NSP Partner. Which is a extra bonus for the ISP/WISP. Let's put it to you this way.. it is not un-common that the, recurring 'commissions' from the Credit Card Processing account is significantly more than that that Merchant is paying for ISP recurring Services :) Regards. Faisal Imtiaz Snappy Internet Telecom 7266 SW 48 Street Miami, Fl 33155 Tel: 305 663 5518 x 232 Helpdesk: 305 663 5518 option 2 Email: supp...@snappydsl.net On 4/13/2011 2:30 PM, Ben West wrote: Thanks everyone for your responses re: serving clients' credit card readers; they were very helpful. A related question I asked on another listserv: does anyone use lightweight VPN solutions in their CPE to create tunnels from the client's location, thru your backhaul, back to your wired/fibered uplink? That is, if you indulge some paranoia and not trust sending potentially plaintext credit card traffic as-is over the same wireless link as other clients' traffic, and/or you don't fully trust WPA2 to keep out snooping by 3rd parties, do you build a VPN tunnel from the card reader back to whatever box manages your fiber link? I received some interesting suggestions for very lightweight VPN, specifically tinc and N2N, which both work on OpenWRT. N2N is apparently lightweight enough (tho can't support large bandwidth) that folks reported it running it directly on access points like Ubnt Nanostation M's. On Mon, Apr 11, 2011 at 7:14 PM, Ben West b...@gowasabi.net mailto:b...@gowasabi.net wrote: I am curious if anyone has experience providing wireless service to small businesses who use a POS credit card system. My own chats with various small biz owners here in St. Louis suggests that their merchant account providers tend to expect a twisted-pair phone line and/or dedicated DSL/cable, no wireless. I imagine this may vary depending on who actually provides the merchant account, but has anyone received feedback from such providers about their expectations for serving the credit card machines wireless? E.g. must you use dedicated, encrypted wireless links (as common sense would suggest), and/or VPNs, or must the POS machine sit on a dedicated LAN, etc? Thanks. P.S. By POS I mean Point of Sale, to avoid any confusion. ;) -- Ben West http://gowasabi.net b...@gowasabi.net mailto:b...@gowasabi.net -- Ben West http://gowasabi.net b...@gowasabi.net mailto:b...@gowasabi.net WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 From: can...@believewireless.net p...@believewireless.net Sent: Wednesday, April 13, 2011 9:39 AM To: wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
This is correct, but we have this cable installed on 100k FM transmitter towers without issues. --- Dennis Burgess, Mikrotik Certified Trainer Link Technologies, Inc -- Mikrotik WISP Support Services Office: 314-735-0270 Website: http://www.linktechs.net LIVE On-Line Mikrotik Training - Author of Learn RouterOS -Original Message- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of can...@believewireless.net Sent: April 13, 2011 1:15 PM To: WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install I'm assuming that's single shielded and not double shielded. On Wed, Apr 13, 2011 at 9:57 AM, Dennis Burgess dmburg...@linktechs.net wrote: http://www.wlan1.com/product_p/cat5e-shielded.htm --- Dennis Burgess, Mikrotik Certified Trainer Link Technologies, Inc -- Mikrotik WISP Support Services Office: 314-735-0270 Website: http://www.linktechs.net LIVE On-Line Mikrotik Training - Author of Learn RouterOS -Original Message- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of can...@believewireless.net Sent: April 13, 2011 8:36 AM To: wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? -- -- WISPA Wants You! Join today! http://signup.wispa.org/ -- -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- -- WISPA Wants You! Join today! http://signup.wispa.org/ -- -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
[WISPA] Can 900MHz do this?
I've been asked by the powers that be in a nearby small municipality to remote control their generators as I have done on our own, so they can quickly shut it down when lightning approaches. They just lost one of their 500KVA generators to lightning. I'd be volunteering my time and expertise in return for brownie points. What I did where I live is use UBNT 2.4GHz gear because the distance is short and it's line of site. Where I've been asked to do this job the layout is the generator is up on a small hill on the far side of the peak from the town (not line of site). The link distance would be about a mile. The hilltop has a smooth rounded transition, not a jagged peak. I'm wondering if 900MHz would be choice here since it's nlos. If I did this in 2.4GHz I think I'd need an intermediate hop. There is a convenient place to put an intermediate hop which might consist of a Picostation plus car battery, charge controller and solar panel. The problem with this is the complexity, cost and theft issues. There's no good data for the area to do something like Radio Mobile. I'm just curious what people's experience has been with 900MHz and hills. Thanks! Greg WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Can 900MHz do this?
We use Tranzeo TR-902's in hills all the time, and have good luck. I use this unit to reboot my Ap's on the towers, it is controlled with a pager. http://www.wesellpagers.com/wireless_switch.htm Bob Rothstein Prime Access (877) 333-1003 Works flawless NGL -- From: Greg Ihnen os10ru...@gmail.com Sent: Wednesday, April 13, 2011 1:54 PM To: WISPA General List wireless@wispa.org Subject: [WISPA] Can 900MHz do this? I've been asked by the powers that be in a nearby small municipality to remote control their generators as I have done on our own, so they can quickly shut it down when lightning approaches. They just lost one of their 500KVA generators to lightning. I'd be volunteering my time and expertise in return for brownie points. What I did where I live is use UBNT 2.4GHz gear because the distance is short and it's line of site. Where I've been asked to do this job the layout is the generator is up on a small hill on the far side of the peak from the town (not line of site). The link distance would be about a mile. The hilltop has a smooth rounded transition, not a jagged peak. I'm wondering if 900MHz would be choice here since it's nlos. If I did this in 2.4GHz I think I'd need an intermediate hop. There is a convenient place to put an intermediate hop which might consist of a Picostation plus car battery, charge controller and solar panel. The problem with this is the complexity, cost and theft issues. There's no good data for the area to do something like Radio Mobile. I'm just curious what people's experience has been with 900MHz and hills. Thanks! Greg WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Can 900MHz do this?
Thanks for the info about 900MHz. It sounds like it would work. The only thing I can find in country is 2.4GHz and 5.8GHz gear. So I'll have to import the 900MHz if I want it or just go with 2.4GHz. I might try the 2.4GHz NanoBridges since I can buy them locally. With the 18dbi antennas it might be enough. There's a water tower that both ends could see. I'm thinking of pointing the NanoBridges at the water tower and hope I get enough scatter. For the controller I'm going to use this: http://www.controlbyweb.com/x301/ It's really cool. It's got two inputs you can watch, two outputs, plus you can watch the temp and input voltage. We use the timers here to start and stop the generator, one input shows the gen's run/not running condition and the other input is for alarms. On alarms I have it email me and others notifications. Greg On Apr 13, 2011, at 4:47 PM, ~NGL~ wrote: We use Tranzeo TR-902's in hills all the time, and have good luck. I use this unit to reboot my Ap's on the towers, it is controlled with a pager. http://www.wesellpagers.com/wireless_switch.htm Bob Rothstein Prime Access (877) 333-1003 Works flawless NGL -- From: Greg Ihnen os10ru...@gmail.com Sent: Wednesday, April 13, 2011 1:54 PM To: WISPA General List wireless@wispa.org Subject: [WISPA] Can 900MHz do this? I've been asked by the powers that be in a nearby small municipality to remote control their generators as I have done on our own, so they can quickly shut it down when lightning approaches. They just lost one of their 500KVA generators to lightning. I'd be volunteering my time and expertise in return for brownie points. What I did where I live is use UBNT 2.4GHz gear because the distance is short and it's line of site. Where I've been asked to do this job the layout is the generator is up on a small hill on the far side of the peak from the town (not line of site). The link distance would be about a mile. The hilltop has a smooth rounded transition, not a jagged peak. I'm wondering if 900MHz would be choice here since it's nlos. If I did this in 2.4GHz I think I'd need an intermediate hop. There is a convenient place to put an intermediate hop which might consist of a Picostation plus car battery, charge controller and solar panel. The problem with this is the complexity, cost and theft issues. There's no good data for the area to do something like Radio Mobile. I'm just curious what people's experience has been with 900MHz and hills. Thanks! Greg WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Question about hosting client's POS merchant account for credit card processing
Faisal, Thank you especially for the response that the network-aware CC readers (should) encrypt their traffic. I was having difficulty finding non-ambiguous information about that. I'm still looking at options for possible lightweight VPN solutions, whether to add another layer of security to the CC readers and assuage paranoia, or other applications where a VPN may make sense. On Wed, Apr 13, 2011 at 1:41 PM, Faisal Imtiaz fai...@snappydsl.net wrote: Hi Ben, You can slice this in as many ways as you like... However if you want to keep it simple and effective... Here is the rundown If they are using the correct processor, who is able to do these transactions over IP / via the Internet, then you don't have to worry about any of this..(all communication is encrypted). And here another interesting gem. Out of all the different ways to do this, and all the different processors / merchant account / transaction clearing house etc.etc. the Best one for ISP's WISP's are the folks at IP Pay... because the take care of the transaction end to end, and actually keep life simple for everyone involved, the Merchant as well as the ISP. The nice un-recognized bonus is all of this is that, typically IP Pay will reduce a Merchant's Credit Card Processing fees and charges (nice bonus for Merchants) and they are willing to 'share' a portion of the Credit Card Processing fees / charges they make with the ISP/NSP Partner. Which is a extra bonus for the ISP/WISP. Let's put it to you this way.. it is not un-common that the, recurring 'commissions' from the Credit Card Processing account is significantly more than that that Merchant is paying for ISP recurring Services :) Regards. Faisal Imtiaz Snappy Internet Telecom 7266 SW 48 Street Miami, Fl 33155 Tel: 305 663 5518 x 232 Helpdesk: 305 663 5518 option 2 Email: supp...@snappydsl.net On 4/13/2011 2:30 PM, Ben West wrote: Thanks everyone for your responses re: serving clients' credit card readers; they were very helpful. A related question I asked on another listserv: does anyone use lightweight VPN solutions in their CPE to create tunnels from the client's location, thru your backhaul, back to your wired/fibered uplink? That is, if you indulge some paranoia and not trust sending potentially plaintext credit card traffic as-is over the same wireless link as other clients' traffic, and/or you don't fully trust WPA2 to keep out snooping by 3rd parties, do you build a VPN tunnel from the card reader back to whatever box manages your fiber link? I received some interesting suggestions for very lightweight VPN, specifically tinc and N2N, which both work on OpenWRT. N2N is apparently lightweight enough (tho can't support large bandwidth) that folks reported it running it directly on access points like Ubnt Nanostation M's. On Mon, Apr 11, 2011 at 7:14 PM, Ben West b...@gowasabi.net wrote: I am curious if anyone has experience providing wireless service to small businesses who use a POS credit card system. My own chats with various small biz owners here in St. Louis suggests that their merchant account providers tend to expect a twisted-pair phone line and/or dedicated DSL/cable, no wireless. I imagine this may vary depending on who actually provides the merchant account, but has anyone received feedback from such providers about their expectations for serving the credit card machines wireless? E.g. must you use dedicated, encrypted wireless links (as common sense would suggest), and/or VPNs, or must the POS machine sit on a dedicated LAN, etc? Thanks. P.S. By POS I mean Point of Sale, to avoid any confusion. ;) -- Ben West http://gowasabi.net b...@gowasabi.net -- Ben West http://gowasabi.net b...@gowasabi.net WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe:http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- Ben West http://gowasabi.net b...@gowasabi.net WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe:
Re: [WISPA] Ethernet Cable for FM Tower Install
Wavelength (m) = speed of light (m/s) / frequency (Hz) Avoid ¼ wavelength multiples. -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Scott Carullo Sent: Wednesday, April 13, 2011 14:54 To: can...@believewireless.net; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 [http://www.flhsi.com/files/emaillogo.jpg] From: can...@believewireless.net p...@believewireless.net Sent: Wednesday, April 13, 2011 9:39 AM To: wireless@wispa.orgmailto:wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.orgmailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
And speed of light (c) = 300,000,000 m/s -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Patrick Shoemaker Sent: Wednesday, April 13, 2011 21:10 To: sc...@brevardwireless.com; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Wavelength (m) = speed of light (m/s) / frequency (Hz) Avoid ¼ wavelength multiples. -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Scott Carullo Sent: Wednesday, April 13, 2011 14:54 To: can...@believewireless.net; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 [http://www.flhsi.com/files/emaillogo.jpg] From: can...@believewireless.net p...@believewireless.net Sent: Wednesday, April 13, 2011 9:39 AM To: wireless@wispa.orgmailto:wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.orgmailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
In space (vacuum). Cables have a velocity factor. On Apr 13, 2011, at 8:42 PM, Patrick Shoemaker wrote: And speed of light (c) = 300,000,000 m/s -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Patrick Shoemaker Sent: Wednesday, April 13, 2011 21:10 To: sc...@brevardwireless.com; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Wavelength (m) = speed of light (m/s) / frequency (Hz) Avoid ¼ wavelength multiples. -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Scott Carullo Sent: Wednesday, April 13, 2011 14:54 To: can...@believewireless.net; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 From: can...@believewireless.net p...@believewireless.net Sent: Wednesday, April 13, 2011 9:39 AM To: wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
Except in this case, assuming the shield is intact and good quality, we are dealing with undesired currents flowing on the surface of the cable shield only. At 100 MHz and assuming an aluminum foil shield in the cat5, the shield metal is thicker than a few skin depths (about 8 um skin depth). So we essentially have a solid conductor in open air, and if the insulation's relative permittivity is close enough to 1 to neglect (should be), the velocity factor is close to 1. -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Greg Ihnen Sent: Wednesday, April 13, 2011 21:32 To: WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install In space (vacuum). Cables have a velocity factor. On Apr 13, 2011, at 8:42 PM, Patrick Shoemaker wrote: And speed of light (c) = 300,000,000 m/s -- Patrick Shoemaker From: wireless-boun...@wispa.orgmailto:wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Patrick Shoemaker Sent: Wednesday, April 13, 2011 21:10 To: sc...@brevardwireless.commailto:sc...@brevardwireless.com; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Wavelength (m) = speed of light (m/s) / frequency (Hz) Avoid ¼ wavelength multiples. -- Patrick Shoemaker From: wireless-boun...@wispa.orgmailto:wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Scott Carullo Sent: Wednesday, April 13, 2011 14:54 To: can...@believewireless.netmailto:can...@believewireless.net; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 [http://www.flhsi.com/files/emaillogo.jpg] From: can...@believewireless.netmailto:can...@believewireless.net p...@believewireless.netmailto:p...@believewireless.net Sent: Wednesday, April 13, 2011 9:39 AM To: wireless@wispa.orgmailto:wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.orgmailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.orgmailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
If the dielectric of coax cables causes them to have a velocity factor of .6, why would the jacket insulation be different? Greg On Apr 13, 2011, at 9:28 PM, Patrick Shoemaker wrote: Except in this case, assuming the shield is intact and good quality, we are dealing with undesired currents flowing on the surface of the cable shield only. At 100 MHz and assuming an aluminum foil shield in the cat5, the shield metal is thicker than a few skin depths (about 8 um skin depth). So we essentially have a solid conductor in open air, and if the insulation’s relative permittivity is close enough to 1 to neglect (should be), the velocity factor is close to 1. -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Greg Ihnen Sent: Wednesday, April 13, 2011 21:32 To: WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install In space (vacuum). Cables have a velocity factor. On Apr 13, 2011, at 8:42 PM, Patrick Shoemaker wrote: And speed of light (c) = 300,000,000 m/s -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Patrick Shoemaker Sent: Wednesday, April 13, 2011 21:10 To: sc...@brevardwireless.com; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Wavelength (m) = speed of light (m/s) / frequency (Hz) Avoid ¼ wavelength multiples. -- Patrick Shoemaker From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Scott Carullo Sent: Wednesday, April 13, 2011 14:54 To: can...@believewireless.net; WISPA General List Subject: Re: [WISPA] Ethernet Cable for FM Tower Install Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 From: can...@believewireless.net p...@believewireless.net Sent: Wednesday, April 13, 2011 9:39 AM To: wireless@wispa.org Subject: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Ethernet Cable for FM Tower Install
Because usually when we're analyzing a coax cable the current we care about is flowing within the cable, on the outer surface of the inner conductor and the inner surface of the outer conductor. The physical dimensions and materials of the cable components and the dielectric constant (relative permittivity) of the material between the conductors defines the velocity factor. This case is different since we're analyzing currents flowing on the outside of the shield. -- Patrick Shoemaker Vector Data Systems LLC shoemak...@vectordatasystems.com office: (301) 358-1690 x36 http://www.vectordatasystems.com On 4/13/2011 23:00, Greg Ihnen wrote: If the dielectric of coax cables causes them to have a velocity factor of .6, why would the jacket insulation be different? Greg On Apr 13, 2011, at 9:28 PM, Patrick Shoemaker wrote: Except in this case, assuming the shield is intact and good quality, we are dealing with undesired currents flowing on the surface of the cable shield only. At 100 MHz and assuming an aluminum foil shield in the cat5, the shield metal is thicker than a few skin depths (about 8 um skin depth). So we essentially have a solid conductor in open air, and if the insulation’s relative permittivity is close enough to 1 to neglect (should be), the velocity factor is close to 1. -- Patrick Shoemaker *From:*wireless-boun...@wispa.org mailto:wireless-boun...@wispa.org[mailto:wireless-boun...@wispa.org]*On Behalf Of*Greg Ihnen *Sent:*Wednesday, April 13, 2011 21:32 *To:*WISPA General List *Subject:*Re: [WISPA] Ethernet Cable for FM Tower Install In space (vacuum). Cables have a velocity factor. On Apr 13, 2011, at 8:42 PM, Patrick Shoemaker wrote: And speed of light (c) = 300,000,000 m/s -- Patrick Shoemaker *From:*wireless-boun...@wispa.org mailto:wireless-boun...@wispa.org[mailto:wireless-boun...@wispa.org]*On Behalf Of*Patrick Shoemaker *Sent:*Wednesday, April 13, 2011 21:10 *To:*sc...@brevardwireless.com mailto:sc...@brevardwireless.com; WISPA General List *Subject:*Re: [WISPA] Ethernet Cable for FM Tower Install Wavelength (m) = speed of light (m/s) / frequency (Hz) Avoid ¼ wavelength multiples. -- Patrick Shoemaker *From:*wireless-boun...@wispa.org mailto:wireless-boun...@wispa.org[mailto:wireless-boun...@wispa.org]*On Behalf Of*Scott Carullo *Sent:*Wednesday, April 13, 2011 14:54 *To:*can...@believewireless.net mailto:can...@believewireless.net; WISPA General List *Subject:*Re: [WISPA] Ethernet Cable for FM Tower Install Get with someone who can tell you exactly how long to make the cables. You don't want them any whole fraction of the FM wavelength freq or it will compound your problem. Make them as de-tuned length as possible. I've had a coax in my hand not hooked to anything in the vacinity of a high-power FM station and it was a resonant length and it got so hot I had to drop it. Scott Carullo Technical Operations 855-FLSPEED x102 *From*: can...@believewireless.net mailto:can...@believewireless.net p...@believewireless.net mailto:p...@believewireless.net *Sent*: Wednesday, April 13, 2011 9:39 AM *To*:wireless@wispa.org mailto:wireless@wispa.org *Subject*: [WISPA] Ethernet Cable for FM Tower Install We are mounting close to a 50kW FM antenna and want to use heavy, double shielded cable for the runs to the APs since we've seen issues in the past. Fiber up the tower but will need 3-4 ft jumpers to the APs. Any recommendations? WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List:wireless@wispa.org mailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives:http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List:wireless@wispa.org mailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives:http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List:wireless@wispa.org mailto:wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives:http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/
