An external filter ahead of the RX amp should help. AFAIK, nobody has yet invented a good front end filter that is not mechanical and somewhat fixed. Hard to do that with software.
From: George Skorup Sent: Thursday, March 24, 2016 6:50 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450i Seriously!? It doesn't need it. The have an electronic, software controlled filter built into the radio. The only thing you'd be doing with external fixed bandpass filters is shaping the Tx output. The 450 radios have a pretty damn clean Tx signal as is, which is one reason why you can stack channels with zero guard band. On 3/24/2016 7:01 PM, Eric Kuhnke wrote: Has anyone experimented with inserting a notch filter on a 450i 900 AP, for a specific 7 MHz? All of the options I can find are for a wider 900 band, more than a specific 7-10 MHz section, and cost $150+ a piece, so you're adding $300 and some jumpers and 0.5dB insertion loss. On Thu, Mar 24, 2016 at 4:59 PM, Rory Conaway <[email protected]> wrote: Unless Yogi Bear is monitoring BooBoo with a baby monitor, in this particular location, I think I’m okay. Rory From: Af [mailto:[email protected]] On Behalf Of George Skorup Sent: Thursday, March 24, 2016 1:40 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450i Dude, there's interference everywhere in the 900 band. Cordless phones, baby monitors, security systems, smart meters, SCADA.. and the list goes on. On 3/24/2016 11:23 AM, Rory Conaway wrote: Are you talking about interference on the same tower or with other towers or devices. I don’t think I’ll have interference issues from other sources. Rory From: Af [mailto:[email protected]] On Behalf Of George Skorup Sent: Wednesday, March 23, 2016 10:29 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450i If you do 6 sectors, you're using the entire band and have nowhere to go when one or two sectors is experiencing interference. Or you have to drop down to 5MHz channel bandwidth which sucks. This is why we do 4x90 clusters. Two channels with wiggle room. Of course that's FSK's 8MHz channel width. I think a lot of people have found that 7MHz on the 450i works best. On 3/24/2016 12:11 AM, Rory Conaway wrote: No, I’m not complaining, I’ll use them. I’ll figure out how to hide them. Still trying to figure out the deployment strategy on a typical tower. I have some learnin’ to do. Rory From: Af [mailto:[email protected]] On Behalf Of Mathew Howard Sent: Wednesday, March 23, 2016 10:08 PM To: af Subject: Re: [AFMUG] Cambium 450i Well, if you want small... there's these, I'm not sure I'd want to try doing channel re-use with them though. http://itelite.net/en/Katalog/900-MHz//SEC-XL0911DP.html On Wed, Mar 23, 2016 at 11:35 PM, Eric Kuhnke <[email protected]> wrote: Any 900 sector is going to be huge.... On Wed, Mar 23, 2016 at 9:28 PM, Rory Conaway <[email protected]> wrote: I’m specifically interested in the 900Mhz, I thought that was the 450i, I didn’t know it covered 5.8GHz also. I also need maximum bandwidth off the tower although I don’t know tower or other mounting locations yet to determine if I need 360 degrees. I actually have more problems with aesthetics and those antennas are going to be an issue due to the size. Right now I’m interested in throughput per antenna and what kind of throughput to expect with GPS. Rory From: Af [mailto:[email protected]] On Behalf Of Brandon Yuchasz Sent: Wednesday, March 23, 2016 9:02 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450i If you guys are talking about the 900mhz 450i 65 degree. Straight from the horse’s mouth is the 65 and the 90 are the same antenna. Just more role off to achieve the 90. I have tested it outside of the 65 degree but within the 90. I was not happy with the results. One customer had to be put back onto FSK yesterday until we can get another AP up or a true 90 degree. Just would not modulate up and finally dropped off completely. Best regards, Brandon Yuchasz GogebicRange.net www.gogebicrange.net From: Af [mailto:[email protected]] On Behalf Of Josh Luthman Sent: Wednesday, March 23, 2016 10:10 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450i There's an OEM 90*... Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mar 23, 2016 11:06 PM, "Rory Conaway" <[email protected]> wrote: I looked at the 450i and noticed the sector antenna is 65 degrees. Does that mean a typical tower installation uses 6 antennas? In that scenario, I’m assuming 10MHz channels if there is no interference. In that scenario, what is the available bandwidth per AP assuming most users get pretty good signal. Or is there a better way to deploy the product? Rory Conaway • Triad Wireless • CEO 4226 S. 37th Street • Phoenix • AZ 85040 602-426-0542 [email protected] www.triadwireless.net “I wish I could play little league now. I’d be way better than before.”
