In either instance there would be self interference when mixing the modes....unless you can find say 50+Mhz of frequency and also distance separation. Just use FDD mode on established sites...
Sent from my iPhone > On Oct 20, 2015, at 7:31 PM, Eric Kuhnke <[email protected]> wrote: > > In a regular FDD system each end of the system is either a high or a low. If > you use the same frequency as an existing FDD 11 GHz link at the same site, > it would be the same as colocating a "high" radio within 10 meters of a "low" > radio. > >> On Tue, Oct 20, 2015 at 4:06 AM, Faisal Imtiaz <[email protected]> >> wrote: >> >>>Instead, the challenge is in assessing and accepting the risk of possibly >> >>>bucking your own 11GHz links or other operator's 11GHz links on or near >> >>>your two endpoints. As there is no reliable way to calculate this type >> >>>of interference, you may only become aware of the problem after you have >> >>>installed and turned up your TDMA system. >> >> Call me stupid, and please explain how that is ......I can understand the >> issue of channel/polarity availability...however how is this potential >> interference different from current ..... Today, one cannot use the same >> channel/polarity on the same site anyway... >> >> The B11, actually opens up the possibility of channel reuse, on the same >> site with angular separtion ...(possibility being a key word). >> >> 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: "Mike Black" <[email protected]> >> To: [email protected] >> Sent: Tuesday, October 20, 2015 12:45:25 AM >> Subject: Re: [AFMUG] Mimosa B11: Exactly what does the mounting look like? >> +1 to Tim's remarks in this thread. The challenge isn't in coordinating the >> same frequency pair in H and V between two sites, in both directions. >> Instead, the challenge is in assessing and accepting the risk of possibly >> bucking your own 11GHz links or other operator's 11GHz links on or near your >> two endpoints. As there is no reliable way to calculate this type of >> interference, you may only become aware of the problem after you have >> installed and turned up your TDMA system. >> >> >> >> If there are no other 11GHz systems within about a half km of either site >> and you don't plan to expand either site with additional 11GHz equipment >> from other vendors, you may be ok. If not, then ? >> >> >> >> Mike Black >> >> Black & Associates >> >> 727-773-9016 >> >> www.bamicrowave.com >> >> >> >> >> >> black & associates >> >> Frequency Coordination ● FCC Licensing ● Engineering Design >> >> >> >> >> >> >> >> >> >> -----Original Message----- >> From: Af [mailto:[email protected]] On Behalf Of Hardy, Tim >> Sent: Monday, October 19, 2015 8:29 PM >> To: [email protected] >> Subject: Re: [AFMUG] Mimosa B11: Exactly what does the mounting look like? >> >> >> >> In the olden golden days building the MCI route with full block systems, we >> would have "bucks" or "bumps" in frequency plans when required, and we >> learned first hand how important it was to use ultra high performance >> antennas or better in such situations. With very little free space loss, >> antenna performance is key and there is very little reliable data on >> close-coupling antenna performance, so it is extremely difficult to >> accurately calculate expected interference levels in these situations. With >> the prevalence of 2&3' antennas these days, antenna isolation will be an >> even larger challenge. >> >> >> >> Sent from my iPhone >> >> >> >> > On Oct 19, 2015, at 8:03 PM, Seth Mattinen <[email protected]> wrote: >> >> > >> >> >> On 10/19/15 16:56, George Skorup wrote: >> >> >> To make Tim's point, we're co-located on a couple towers with other >> >> >> 11GHz users and using both the high and low of a channel pair at both >> >> >> ends is unpossible. (yes, that's a word :) >> >> > >> >> > It's a perfectly cromulent word. >> >> > >> >> > ~Seth >> >
