It's nice to have some fresh air amongst the smoke. Thanks Jim.
I have been using UHF connectors for decades without a single problem, with the caveat that I purchase ONLY brand name (e.g.: Amphenol) connectors, take care to install them properly, and use them only once (reuse of connectors removed from other cables is not permitted in my station) . And yes, I do use "type N" fittings and other less common types (type C, 7/8 flange, etc.) for some work where appropriate. - Jim, KL7CC Jim Brown wrote: > On 4/25/2012 4:09 PM, Alan Bloom wrote: > >> P.S. Sorry, I guess I violated the Usenet rule against posting objective >> data... >> > > It should be noted that in an earlier post, I noted that I had measured > the loss of 1300 ft of coax with characteristics like LMR400 that had > been cut into 100 ft and 200 ft lengths for a DX trip. I noted that > there were at least 25 PL259s and 13 Amphenol barrels in line, and that > the loss at every frequency up to 500 MHz was less than the mfr's spec > for the cable at that frequency. While I did not go to the extent of > finding and measuring 1,300 ft of the same coax and subtracting out the > loss, I submit that my measurements show that the loss in those 38 > connectors is negligible to at least 500 MHz. > > And I also submit that not every small deviation from the ideal MATTERS > in every real world conditions. Good engineering is making good choices > for a given situation. The world does not need the $800 hammers demanded > by certain military specs. > > Shouting down? Hardly -- when completely illogical arguments were > presented as justification for a position I pointed them out. > > Also -- I don't trust the precision of loss measurements for very small > losses -- there are two many factors that can pollute the measurement, > and often the accuracy of the instrumentation is a significant.fraction > of the result being measured. For example, try getting a good number for > the loss of 100 ft of LMR400 at 1.8 MHz. You'd better be measuring at > least 1,000 ft to get even 10% accuracy! Several years ago, a VE1 (RGB, > I think) sent me data for measurements he had made of a sizable number > of UHF connectors in a string. His numbers for loss in a single > connector were significantly less than what Alan has posted. > > 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 > > ______________________________________________________________ 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
