> Is there anything that I can do with the MP to reduce the intermod/NB
> problem so that I can copy signals?
No. That's the nature of the analog IF noise blankers. The strong off
frequency signals modulate the noise and when you set the threshold
very close to the signal level in order to blank the line noise, the
strong signals will cause false blanking and generate intermod.
A noise blanker is at best a mixer ...
73,
... Joe, W4TV
On 2/23/2011 5:14 PM, Robert L. Shohet wrote:
> Hi,
>
> I have a recent and significant line noise problem at my qth.
> In the past, I was fairly successful at using the FT1000MP NoiseBlanker(s)
> to take filter it out but now when there are signals on the band greater
> than
> about S5-6, the resulting intermod is such that it obliterates weaker
> signals calling me.
>
> The intermod sounds a lot like the line noise itself, but I only hear it
> when
> the station is transmitting and is reasonably close in frequency to me.
>
> This was a huge problem this past ARRLDXCW weekend as the line noise
> was very loud and I had to crank the NB to maximum to remove it.
>
> With the intermod, if the station calling wasn't at least s6-7, I could not
> copy.
>
> I have had all the typical FT1000MP mods installed, including the W8JI key
> clix
> mod and AF gain mod and I also use the International Radio Roofing filter.
>
> Is there anything that I can do with the MP to reduce the intermod/NB
> problem
> so that I can copy signals?
>
> Please let me know. Tnx& 73
>
> Bob KQ2M
>
>
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