Dave, I performed similar tests using a Marconi signal generator in the following test configurations:
1) static benchmark test: generator directly coupled to 144Mhz receiver 2) live on the air tests: smal antenne coupled to generator, receiver uses outdoor 144Mhz antenna. Test was performed with outdoor antenna aimed at a quiet direction. My results between hearing the weak signal in the noise yes/no: static benchmark setup: 1.8 dB Live on the air setup: 2.2-2.5 dB Same happens when I insert the DCI 4-pole 144 bandfilter, which has 0.8dB insertion loss; never ever heard any difference in copying weak signals. These results and some 15 years of trying various pre amps in many situations, made me decide to forget about this whole pre-amp hype (I never did EME, so cannot decide on that) on VHF. 73 Mark, PA5MW > > At the noise level, I had to work pretty hard to convince myself that > I > could hear the difference that one db would make. Two db was > noticeable, but just barely. Three db was definitely noticeable and > in > my opinion could easily make the difference between making a weak > signal > DX contact or not. > > 73, > Dave AB7E ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
