"Any new ideas on high performance preamps for 160m?? " The only thing I can suggest is to build the front end of the preamp as if it were a JW Miller style crystal radio, followed by the amp itself. Yep, crystal radio. Those sets had a bandwidth of ~10khz. Super selective and, yes, on 160m the user would have to retune often when browsing the band. Of course, a nice feature could be automatic tracking.
73, Charlie, N0TT On Tue, 23 May 2023 12:55:36 -0400 <[email protected]> writes: > Hi Folks > > > > I am following the conversation about LOG RX antennas, I understand > the pain > from a noise city lot on 160m. it is hard. I am using Waller Flag's > vertical, since 2006, and horizontal since 2010, however vertical > noise is > so bad with new solar panels and EV charges , on top of LED lights, > that I > no longer have my Vertical WF, it is inefficient for a city lot. My > HWF is > working very well. > > > > The reason I started a new tread is what I noticed during the last > DX > season. The number of KW station on 1840 is growing exponentially. > If you > have 100 station with 1kW on a small portion of the band, it is > equivalent a > 100 KW single station. Imagine 500 station, 500KW, My HWF preamp is > in use > since 2010, my first QSO with my 6xBF981 preamp was XU7ACY, long > path (160m > CW), from the same city lot, not so noise as it is today. However > now with > the number of FT8 KW's, and most of them very bad linearity, with > phase > noise several KHz on each side, my old preamp IP3 is not strong > enough as > it used to be. > > > > I will be back to old NORTON's preamp on my station with new high Q > front > end. With all the power of 100's FT8 station at the same time, the > consideration for a new RX antenna and new preamplifier is raising > the bar > on overall performance. > > > > Any new ideas on high performance preamps for 160m?? We will need > it. > > > > 73's > > JC > > N4IS > > > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
