Hi Broke, I think it stays not to discussion, that a better BNC can be usable up to some GHz, but the longtime life cycle is (& through often using impedance changings/unsure contacts) _I think_ clear worser as TNC/N...
Have good time! (Im over longtime time-nuts reader ) Karesz 2010/3/26 Brooke Clarke <bro...@pacific.net> > Hi John: > > When HP came out with the first VNA (8410) I attended one of the demos. > Part of that was testing a BNC cable over the microwave range. It worked > much better than I expected. It turns out that the cores of a type-N, TNC > and BNC connector are all the same and they will properly interface with > each other (after some modification to allow it). The problem with panel > mount BNC connectors is the back side where the impedance is not controlled. > If you use a panel mount BNC-BNC connector it's impedance is quite good. > > Trompeter used to make a series of connectors (N, TNC, BNC) that all had > the same panel side outline. I used them in a family of Wilkinson power > dividers. > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > > > > jimlux wrote: > >> John Allen wrote: >> >>> A few notes about the connector. >>> >>> First, I hate BNC connectors. >>> >>> But the BNC is useable to 11 GHz (No vswr spec.), and has a VSWR spec. of >>> 1.3:1 >>> up to 4 GHz. (See link below, about half way down the page.) >>> http://www.amphenolrf.com/products/bnc.asp?N=0&sid=4BAAA780568BE17F& >>> >>> The application is not a precision one except for frequency - Power >>> transfer >>> inaccuracy due to return loss is not a big deal here, we are not using it >>> in a >>> VNA or power meter etc. >>> PS: Would anybody be interested in testing an SMA to BNC-F and BNC-M to >>> SMA pair >>> on a VNA? >>> >>> Further, some BNC adapters (to SMA) are specified. to 8 GHz. With 1.25:1 >>> VSWR >>> Also - here is a BNC to SMA bulkhead with 10 GHz VSWR max of 1.4:1 >>> http://www.fairviewmicrowave.com/adaptersbncsma.htm (Bottom middle). >>> >>> Now if only we could find a SMA to SMA bulkhead that fit in a BNC >>> mounting >>> hole... >>> >>> John Allen K1AE >>> >>> >>> >> I think I've seen hermetic sealed feedthrough for applications like vacuum >> chambers that fit in a larger than normal hole. But they're probably also >> really, really expensive. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.