Topband: New MFJ 259C available

[Joe Subich, W4TV]

 > (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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