PBR is designed to be mated with UBR, etc. Otherwise the dual gaskets (or lack thereof) will cause issues.
Daniel White | Managing Director SAF North America LLC Cell: (303) 746-3590 Skype: danieldwhite E-mail: <mailto:daniel.wh...@saftehnika.com> daniel.wh...@saftehnika.com From: Af [mailto:af-bounces+afmugdw=gmail....@afmug.com] On Behalf Of Colin Stanners via Af Sent: Sunday, September 21, 2014 6:25 PM To: af@afmug.com Subject: Re: [AFMUG] Waveguide compatibility info? Can grooved and ungrooved waveguides be safely be used together, e.g. in outside weather? Like PBR and UBR? On Sun, Sep 21, 2014 at 12:10 PM, Chuck McCown via Af <af@afmug.com <mailto:af@afmug.com> > wrote: Waveguide is a broadband bandpass filter. You can couple one size to another as long as there is overlap in the pass band. Go to low in frequency and the waveguide just blocks the signal. The cut off frequency. It is not a brick wall filter. Normally the cut off frequency is something like the 1 dB mismatch loss frequency, go lower and the loss goes up quickly. Different problem in going too high. To use my photon analogy: Photons simply will not fit down the tube if they are too large (low frequency). Go too high in frequency and you get other than single file photons trying to get town the tube. Like two abreast, two rows two columns etc etc. Those are called higher order modes and you can use them if you take care of launching and receiving the signal in a low loss high return loss manner. http://www.rfcafe.com/references/electrical/waveguide-chart.htm Then there are the non rectangular waveguides. Ridge waveguide is physically smaller than rectangular waveguide. Circular is good for dual pol and is exceedingly low loss but extra care has to be taken to prevent polarization rotation. -----Original Message----- From: cstanners--- via Af Sent: Saturday, September 20, 2014 6:41 PM To: Jason McKemie via Af Subject: [AFMUG] Waveguide compatibility info? Does anyone have resources/FAQs/etc to understand Waveguide compatibility?
