AD6XY - Mike wrote:
>
> I have Radcom in front of me. The editor has two reviews, the K3 and a new
> Alinco hand held. I suppose it shows the state of amateur radio in the UK
> that the hand held makes the front cover. The K3 reviews very well
> indeed.
>
> So... to your figures. The 500Hz filter is 8 dB worse than the 2.7 kHz
> filter out of band but at close spacings. According to the review it
> suffers non-linearites not noted in the 2.7kHz stock filter nor the 8 pole
> INRAD the 400Hz filter.
>
NOT SO...G3SJX only tested the 2.7k, 1.8k and a 500...NOT a 400. He was
speculating about the 400 because Sherwood and ARRL had good measurements
with one (Sherwood had nearly identical IMD measurements with the 500 which
I posted previously - below). There's another problem with the 1.8k data
which also looks bad.
Sorry but I trust Elecraft/Sherwood's published measurements of the 400/500
listed below. Peter may have had both a bad 1.8k and 500.
http://mailman.qth.net/pipermail/elecraft/2008-June/091593.html
http://mailman.qth.net/pipermail/elecraft/2008-June/091606.html
73, Bill
--
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