Hi Sinisa,
I'm sure you are right, you normally always are.
However the Dunestar SPECS on their web site claim 40dB band-to-band
rejection.
I was just quoting the specs.
http://www.dunestar.com/store/Single-Band-Bandpass-Filters-pid-4.html
As I said, I use my own home-brew pre-selectors and the good one (40m only)
has a 40db rejection bandwidth of 500 kHz.
It is tunable using Topf-Kerns (I think the English name for that is
pot-core or something like that).
Description: download #8 on this page:
http://www.dj0ip.de/downloads/
73 - Rick, DJ0IP
(Nr. Frankfurt, Germany)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of shristov
Sent: Monday, September 12, 2016 11:51 PM
> Of course one could also purchase extern BPFs like ICE or DUNESTAR at
> $100 per band. They have 40dB or so of out of band attenuation.
Filters like those have trouble in achieving 40 dB attenuation in the
next/previous ham band.
At +/- 750 kHz (or +/- 1.5 MHz) attenuation is practically non-existing.
73,
Sinisa YT1NT, VE3EA
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