Topband: New MFJ 259C available

Gregg W6IZT gregg.w6izt1 at
Wed Mar 5 14:43:28 EST 2014

My bad, I see it now.

-----Original Message-----
From: Gregg W6IZT [mailto:gregg.w6izt1 at] 
Sent: Wednesday, March 05, 2014 2:43 PM
To: 'topband at'
Subject: RE: Topband: New MFJ 259C available

The AIM4170 family is not included in this review?


-----Original Message-----
From: Topband [mailto:topband-bounces at] On Behalf Of Joe
Subich, W4TV
Sent: Wednesday, March 05, 2014 2:33 PM
To: topband at
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.


    ... 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.
> 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
> 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.
> Paul, W9AC
> _________________
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