> (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
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