Tom Cathey wrote:
> Here's a coincidence!
>
> I just received an email from a buddy who is considering buying an
> FT-1000MP. They are being closed out and discontinued according to a
> salesman.
>
> Here's the salesman's comments about the class A stage. This was written by
> my buddy based upon his conversation:
>
> "The MP Mark 5's are being closed out by XXX at $XXXX. [I deleted the X
> info] The salesman, a DXer/contester said it is being discontinued. The
> class A amp capability proved to be a negative. If you can believe this, it
> allowed others to "nustle" in too close to you if your IMD was that far down
> and make your RXing difficult if not impossible. You need some artifacts to
> hold others at bay!"
>
>
> I won't even comment on that one... [gag - cough]
I'd often wondered about modifying our contest exciter to provide an
additional path round the narrow filter after the rf processing -
putting the cliped signal through a 15kHz filter and injecting some back
into the tx strip downstream. That way you don't have to wipe out the
whole band to keep clear air. I never got round to trying it.
Far more fun would be something based around the modern DSP/linearised
feedback transmitters where (in theory) you can have full control of
your splatter spectrum, and make it adapt to the situation.
Something I still want to try (one day...) is DSP on rx, where a wider
band rx looks for signals that correlate with the crud in your wanted
passband, and use that to cancel it out.
Steve
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