I just bought two of these antennas from Bob (fluke.l) and asked him to throw in adapters from TNC on the antenna to female F so I can use ordinary 75 ohm cable TV coax from rat shack. He charged an extra $5 for the adapters which I think is a pretty good deal. Still waiting on delivery so I don't know for sure what was thrown in the box but I'll let you guys know if there was a problem.
-Bob On Tue, Jun 23, 2009 at 7:50 AM, David C. Partridge < david.partri...@dsl.pipex.com> wrote: > Hmmm now all I have to do is find a TNC connector to fit FT100 (or RG6) > without paying 5 times thet value of the connector for shipping - or just > use RG58 as I've got BNC for this, and can easily get TNC for it too. > > Thanks to all > Dave > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Dave Baxter > Sent: 23 June 2009 13:40 > To: time-nuts@febo.com > Subject: Re: [time-nuts] TNC connectors > > > Message: 3 > > Date: Tue, 23 Jun 2009 07:54:02 -0400 > > From: Chuck Harris <cfhar...@erols.com> > > Subject: Re: [time-nuts] TNC connectors > > To: Discussion of precise time and frequency measurement > > <time-nuts@febo.com> > > Message-ID: <4a40c25a.7080...@erols.com> > > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > > > Dave Baxter wrote: > > > > > Doing that with BNC's will lead to a flaky connection, as > > the centre > > > pin on the 75r ones is much smaller. The other way round (50r plug > > > into 75r > > > socket) will damage the socket. As TNC's are very similar > > to BNC's ??? > > > > You are thinking of the incompatibility between 50 ohm and 75 ohm *N* > > connectors. > > > > 75 ohm BNC are use the same center pin hardware as 50 ohm BNC. The > > only difference is in the white plastic (teflon) insulator. In the 50 > > ohm BNC, the center insulator goes all the way to the tip of the > > center pin. In the 75 ohm BNC, the center insulator is abbreviated. > > > > HP/Agilent uses 75 OHM BNC's on several of its devices that have > > switchable impedances. For example, the 3586C. > > > > -Chuck Harris > > > Indeed looking as some more data sheets. > > However, I have somewhere in the deed box at home, some Ex BT BNC's, marked > up as 75 Ohm, that have very much smaller center pin's than the common or > garden 50r types, as well as less plastic in there too. > > We once had a Novell computer network in the office, that used 93r coax > cable, and 50r BNC's, at 100MBPS. Using Thomas Conrad cards I seem to > remember. We still have the real of 93r coax. > > (It was very much faster end to end, and much more stable than the TCP/IP > based Microsoft network we have now, but I digress.) > > In general, yes indeed size for size, 75r coax will be less lossy than 50r > types, but if the RX does present a nominal 50r load, they may be some > potential issues. However, if the antenna is an active type, it's probably > not worth fussing over. Enough people have used what's recomended I guess > and found no problems. Just use good quality cable, not the so called "Low > loss" TV coax. I'd guess the foam dielectric "Satelite LNB" cable would > do. > It fit's 'F' connectors too. > > Cheers All. > > Dave B. > > > _______________________________________________ > 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.