But in the case of dual chain radios, is what Ken said correct, that one signal at 0db amounts to the same thing as two at -3db? If that's the case, there wouldn't seem to be any interference rejection advantage to dual slant over dual linear, regardless of what polarity the interference is.
On Wed, Mar 25, 2015 at 2:55 PM, Chuck McCown <[email protected]> wrote: > Depends on which chuck you mean.... > Slant helps with multipath. Linear to slant rejection is only 3 dB. If > your interference is dual pol linear, you have two choices: > Stay linear with a different frequency and hope for the best. Or use dual > slant for a 3 dB reduction of the interfering signal. Better than a poke > in the eye with a sharp stick. > > But if you are only running one single chain/radio and the interference is > on the same frequency, orient your antenna 90 degrees to the interference > and you will get 20+ dB of rejection. Irrespective of the absolute > polarization. If they are +45 make yours –45 etc etc. > > *From:* Jeremy <[email protected]> > *Sent:* Wednesday, March 25, 2015 1:47 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] AF5X polarization > > Yeah, I knew about the multipath advantages. It seemed to me that 3db > of rejection would increase your CINR by 3db. Am I wrong here? Chuck? > > On Wed, Mar 25, 2015 at 1:44 PM, Mathew Howard <[email protected]> > wrote: > >> I'm not sure that it really gains much if anything as far as >> interference rejection... I've read that even though the interfering V/H >> signals are going to be 3db weaker, you're now going to be seeing two >> signals (assuming dual polarity H/V interference) at that same signal level >> and the two combined is essentially the same as seeing the extra 3db. >> Hopefully someone who actually knows can confirm whether or not that's true. >> >> if that is the case, I think dual slant is mostly only going to help with >> multipath issues. >> >> On Wed, Mar 25, 2015 at 2:36 PM, Jeremy <[email protected]> wrote: >> >>> Well if I can gain 3db by turning 45/45 I'm all over that. >>> >>> On Wed, Mar 25, 2015 at 1:32 PM, Josh Luthman < >>> [email protected]> wrote: >>> >>>> That's what everyone keeps saying =) >>>> >>>> >>>> Josh Luthman >>>> Office: 937-552-2340 >>>> Direct: 937-552-2343 >>>> 1100 Wayne St >>>> Suite 1337 >>>> Troy, OH 45373 >>>> >>>> On Wed, Mar 25, 2015 at 3:30 PM, Jeremy <[email protected]> wrote: >>>> >>>>> 3db right? >>>>> >>>>> On Wed, Mar 25, 2015 at 12:54 PM, Josh Luthman < >>>>> [email protected]> wrote: >>>>> >>>>>> Rejection from other V/H radios. >>>>>> >>>>>> >>>>>> Josh Luthman >>>>>> Office: 937-552-2340 >>>>>> Direct: 937-552-2343 >>>>>> 1100 Wayne St >>>>>> Suite 1337 >>>>>> Troy, OH 45373 >>>>>> >>>>>> On Wed, Mar 25, 2015 at 2:53 PM, Ken Hohhof <[email protected]> wrote: >>>>>> >>>>>>> Anybody know what you give up by using V/H instead of dual slant >>>>>>> with the AF5X? >>>>>>> >>>>>>> If the path has clear LOS and no multipath, I can't see why it would >>>>>>> care or even be able to tell the difference. >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>>> >>> >>> >> >> > >
