Yup. Something with 53 dB F/B ratio is some serious kick-ass antenna [😊]
The F/B ratio required is a direct function of the C/I performance of the radio's receiver. If you need 30+ dB of C/I to be at a solid 256 QAM, then you don't need 53 dB of F/B ratio. 32 dB will do just fine. 36/37 or 53 dB does give you more margin to play around with the back-to-back AP's Tx power but generally it may be overkill. Thanks, Sriram ________________________________ From: Af <[email protected]> on behalf of Faisal Imtiaz <[email protected]> Sent: Tuesday, December 22, 2015 1:04 PM To: [email protected] Subject: Re: [AFMUG] F/B Video on Cambium forum Interesting info.. So if we can use sector antenna which have 36/37/or 53 db of Front to back ratio, then these would be some serious kick ass antennas ? Regards. Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] ________________________________ From: "Sriram Chaturvedi" <[email protected]> To: [email protected] Sent: Tuesday, December 22, 2015 11:31:45 AM Subject: Re: [AFMUG] F/B Video on Cambium forum Hi Ken, You are correct about ATPC taking care of equalizing the UL RSSI at the AP. For downlink, as long as the antenna has good F/B ratio (32 dB like you indicated) and the back-to-back APs are set to the same Tx power, it should help. But maintaining 32 dB F/B ratio throughout the beam-width of the antenna can be a challenge. Thanks, Sriram Join the Conversation Cambium Networks Community Forum<http://community.cambiumnetworks.com> On Dec 22, 2015, at 10:14 AM, Ken Hohhof <[email protected]<mailto:[email protected]>> wrote: It probably seems that F/B ratio doesn’t need explaining. The biggest hurdle is probably when WISPs start looking at third party antennas and other shiny objects (like price and antenna gain) distract them from looking for a F/B spec around 32 dB if they ever want to do frequency reuse. The main thing this video probably does is to focus on why F/B ratio is important, even with GPS sync. I would add that uplink interference can be worse because of varying distance to SMs. A near SM can blast through the backside of the sector and overwhelm the signal from a distant SM on the front side. ATPC can help with uplink interference by at least equalizing the received levels from near and far SMs, but ATPC typically doesn’t help with downlink interference. From: Sakid Ahmed<mailto:[email protected]> Sent: Tuesday, December 22, 2015 9:51 AM To: [email protected]<mailto:[email protected]> Subject: [AFMUG] F/B Video on Cambium forum Hello, We just uploaded a video about F/B ratio on our community forum. Curious to get some feedback from all the experts here. http://community.cambiumnetworks.com/t5/ePMP-1000/What-is-front-to-back-ratio/m-p/47820 Thanks Sakid Sakid Ahmed [email protected]<mailto:[email protected]> (M) 1-773-780-5226 Skype: Sakid.ahmed Join the Conversation Cambium Networks Community Forum<http://community.cambiumnetworks.com/> From: Af <[email protected]<mailto:[email protected]>> on behalf of Chuck McCown <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Date: Tuesday, December 22, 2015 at 8:57 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: [AFMUG] Cambium Headphone adapter Silly, you could have made it up in volume... From: Forrest Christian (List Account)<mailto:[email protected]> Sent: Tuesday, December 22, 2015 3:24 AM To: af<mailto:[email protected]> Subject: Re: [AFMUG] Cambium Headphone adapter I really wish I could find a custom cable manufacturer who I could have make these for me again. The company I was having make them kept raising the per piece prices and also the minimum order... then was shocked when I refused to order several years worth for twice what I was currently charging my customers. On Dec 21, 2015 4:17 PM, "George Skorup" <[email protected]<mailto:[email protected]>> wrote: That would need to be a 6p6c/rj12. You could easily buy that or anything like it, clip the rj plug off and crimp a new properly wired rj12 on it. The best kits were the ones Forrest had made that were molded and are no longer made. And of course every freakin tech lost them. On 12/21/2015 3:44 PM, Josh Reynolds wrote: Actually, this link may be better http://m.aliexpress.com/item/32284032088.html?adminSeq=220301292&productId=32284032088&productId=32284032088&shopNumber=1019232&productSubject=Free-Shipping-3-5MM-Phone-Headset-to-RJ9-RJ10-RJ22-Headset-Plug-Adapter-3-5MM-to&detailNewVersion=2&tracelog=wwwdetail2mobilesitedetail On Dec 21, 2015 3:36 PM, "Nate Burke" <[email protected]<mailto:[email protected]>> wrote: I didn't see it on the PDMNet website, I emailed them to ask. I"m pretty sure that although Monoprice has everything else, including completely outfitting your elementary school band, they don't have these adapters. On 12/21/2015 3:22 PM, Josh Luthman wrote: SurplusWirelessGear and maybe PDMNet sell them ready to go, I believe. Josh Luthman Office: 937-552-2340<tel:937-552-2340> Direct: 937-552-2343<tel:937-552-2343> 1100 Wayne St Suite 1337 Troy, OH 45373 On Mon, Dec 21, 2015 at 4:05 PM, Josh Reynolds <[email protected]<mailto:[email protected]>> wrote: Probably monoprice. Monoprice.com<http://monoprice.com> On Dec 21, 2015 3:02 PM, "Nate Burke" <[email protected]<mailto:[email protected]>> wrote: Does anybody sell the RJ14 to Headphone jack premade at a reasonable price, <$10? I used to have a pile of them, but I Can't find them now, and I'm too lazy to go get the components to make one. I think once upon a time, someone was selling a default plug and headphone adapter in a combo pack.
