Why use barrels? Doesn't Amphenol or Pastornack make a female UHF connector to put on cable end. For this specific use, a custom built cable seems appropriate.
Sent from my iPhone ...nr4c. bill > On Oct 11, 2016, at 4:38 AM, Jim Brown <[email protected]> wrote: > >> On Mon,10/10/2016 4:49 PM, Josh Fiden wrote: >> If you're concerned about the additional loss of a barrel connector at >> 50MHz, you should be using feedline with lower loss than LMR400 up the tower. > > The loss in GOOD quality UHF connectors and barrels at 50 MHz is negligible. > There are urban legends (false, as usual) claiming that every connector loses > a dB. The grain of truth is that JUNK connectors may introduce significant > loss, but GOOD connectors and barrels do NOT. "Good" means Amphenol 83-1SP > for the PL-259s, and Amphenol or surplus MIL-spec for the barrels. > > Several years ago, I made up more than a dozen 100 ft cables using a cable of > somewhat better construction than LMR400 (Commscope 3227) for a DX trip. The > connectors were Amphenol 83-1SP that I soldered myself. To test those cables, > I spliced them together using Amphenol barrels and measured the loss of about > 1300 ft of cable up to 500 MHz using HP generator and spectrum analyzer. The > measured loss was LESS than the manufacturer's spec. There were 27 83-1SPs > and 13 barrels in line. > > JUNK connectors are the shiny,unbranded stuff you see at ham flea markets, > and sold online and in ham magazines. > > 73, Jim K9YC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
