On 28 Feb 2006 at 4:01, G3YIQ wrote:
> I've recently completed K2 5336 but only today connected a properly
> resonant antenna on 40m. The results surprised me. With the pre-amp on
> the receiver suffers from serious overload and intermodulation and
> 40m - a problem that does not occur with the same set up on my
> FT1000MP. I've played around with AGC and RF gain settings but it is
> pretty much unusable with the pre-amp switched on. Both the FT1000MP
> (with no attenuation) and the K2 (with the pre-amp switched on)
> register S9 for 50 microvolts signal input, so I'm assuming (perhaps
> wrongly?) that they have comparable sensitivity under these
> conditions. I know I'm getting sufficient sensitivity for the band
> conditions with the pre-amp off, but the apparent poorer performance
> of the K2 puzzles me, particularly as other independent tests have
> indicated that it should be better than the FT1000 with respect to
> strong signal handling.
>
> Any suggestions?
>
> 73 Bob G3YIQ
Your observations don't agree with the experiences of others at all,
so I suspect there is a fault somewhere in your K2, possibly in the
preamp itself.
On my K2 I use a fairly low long wire, so it is probably well down on
your resonant antenna. With the preamp in there is the odd intermod
product carrier from the broadcast stations on 40m at night but
hardly noticeable and certainly they don't cause any problems. But I
very rarely use the preamp, it is certainly not needed on 40m and the
lower bands, and only occasionally on 10m and 12m when I am trying to
copy weak signals. I am surprised you need it when you have a good
resonant antenna.
73 Dave G3YMC
http://www.davesergeant.com_______________________________________________
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