Gentlemen, I never used preamps at the feedpoints of my Beverages*, and I probably should have left out "at the feedpoint". I just noticed that Joel's graphs sometimes showed a very low signal level from the Beverages, and was curious.
*However, I *did* use a preamp at the station end of the F-6 feedlines to them. (A series 2k pot there adjusted the level to match the TX antenna; and on occasion eliminated intermod.) The output of a Beverage is rather low, and sometimes I would switch between them and the inverted-L, etc. Having said that, somewhere I read that on occasion, others absolutely needed them at the feedpoint, when the noise floor was exceptionally low (I believe just before sunrise). But I guess that's a moot point here. The longest F-6 feedline here was about 600'. On Tue, Jan 14, 2025, 3:10 PM Jim Brown <[email protected]> wrote: > On 1/14/2025 12:13 PM, [email protected] wrote: > > Thanks. No, I did not have preamps at the feed point of the Beverages. > How about at the station end, Joel? Sorry, I should have been more clear. Is the sensitivity of a one wavelength Beverage low enough that a preamp > at the feedpoint is needed? Loss in decent coax is pretty low at 2 MHz, ... > As I said, sometimes it is, according to others. Sorry I don't have a reference. :-) 73 Mike W0BTU https://web.archive.org/web/20190827040547/http://w0btu.com/ > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
