My bad, I see it now.
-----Original Message-----
From: Gregg W6IZT [mailto:gregg.w6izt1@gmail.com]
Sent: Wednesday, March 05, 2014 2:43 PM
To: 'topband@contesting.com'
Subject: RE: Topband: New MFJ 259C available
The AIM4170 family is not included in this review?
Gregg
W6IZT
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Joe
Subich, W4TV
Sent: Wednesday, March 05, 2014 2:33 PM
To: topband@contesting.com
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
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