The Vertex has a .20uV measured and the rest of the specs are just as good. I am blessed with my location and yes, noise can be high. I'll try without the preamp first and see where I'm at, and the use of the proper antenna will help. I've spent so much alreqady that a few more buckis for 7/8" won't make a difference and will err on the side of caution with intermod.
--- In [email protected], n...@... wrote: > > At 2/4/2009 20:16, you wrote: > >My thoughts as well :) I know that the Big Bear repeater uses a > >Hamtronics and it does well enough but we needed far better quality > >and went commercial. > > > >My only thought that was as a preselector the Hamtronics might have > >something to offer. > > If we're talking about the LNP-146, I wouldn't even call that a "helical > resonator". Looks to me like 3 low-Q coils. > > Seriously, if your Vertex VHF RX needs help from a preamp, it's defective > IMO. The noise floor in SoCal is fairly high in most areas that have a > view of LA/San Bern./Riverside. If the 12 dB SINAD is 0.3 µV or less, you > don't need a preamp here. > > Bob NO6B > > P.S: ditch the LMR400 - it will cause desense, sooner or later. If your > antenna run is short enough to not need hardline, use RG-214. The > silver-plated braid will keep the duplex "scratchies" away. >
