Graham,
The bandpass filter is usually sufficiently broad to cover most or all of
160 meters - so you have something abnormal. Check L5 - it should be 33 uH
(orange-orange-black). Early K2s had an 820 ohm resistor across C14 to
further broaden the 160 meter response, so you could try adding that to see
if it helps.
73,
Don W3FPR
> -----Original Message-----
> Gents,
> I'm having difficulty getting decent power output across
> the whole of the 160m band, I can tune up the bandpass filter to get 15
> watts at any point on the band but the level drops very quickly as I
> tune either side of the peaked frequency.As an example If I peak up at
> 1900Khz I have under 2 watts output at the band edges and a
> corresponding loss of receive sensitivity.The performance on 80m is up
> to spec. so I am guessing that this excludes a problem with L3 or L4.
> Yes I've checked the component values & soldering to no avail so am
> looking to the list for inspiration.
>
> Thanks, Graham G4cpd
>
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