The AIM4170 family is not included in this review? Gregg W6IZT
-----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Joe Subich, W4TV Sent: Wednesday, March 05, 2014 2:33 PM To: [email protected] Subject: Re: Topband: New MFJ 259C available > (look for 1320, 1460, and 1530 kHz). ... and looks like a couple other locals at 1010 and 1060. 73, ... Joe, W4TV On 3/5/2014 2:03 PM, Paul Christensen wrote: >> Where is a selectivity spec or a description?? >> >> 73 Tom > > Tom, > > Apart from the N2PK analyzer, I don't know any published selectivity > spec. The detector minimum res. bandwidth of the N2PK unit is 7 Hz and > produces +4dBm into 50 ohms. > > FWIW, RigExpert put together a comparison of analyzers based on > measurement topology. For sure, it's a biased piece -- especially when > the MFJ product is discussed. So, keep that in mind. > > http://www.rigexpert.com/index?s=articles&f=aas > > The plot below shows how well the N2PK analyzer can selectivly ignore a > large multi-volt base voltage from three nearby AMBC stations located 2 > miles to the south. Two of the AM stations are Non-D in the daytime. > One is 15KW, the other is 5KW. Note that the T is resonated to 1420 > kHz, right where the stations transmit (look for 1320, 1460, and 1530 > kHz). The attached plot shows total RF immunity on the X trace. On the > R trace, small "blips" do show - each representing the local AMBC > stations. However, even these can be easily ime-averaged away in the > software. > > http://72.52.250.47/images/N4NN.jpg > > Paul, W9AC > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
