"rick@dj0ip.de" <Rick@DJ0IP.de> wrote:
> 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
Hi Rick,
that's what I had in mind.
Taking the 7 MHz filter as an example,
there is 40 dB attenuation on ~3.5 MHz.
But on 6 MHz the attenuation is practically nil.
Your preselector is the right tool for the job.
But it's receive-only, given the 7.5 dB passband attenuation.
Dunestar etc filters must have a much wider passband
in order to achieve low enough passband attenuation,
making them suitable for transmitting.
Best 73,
Sinisa YT1NT, VE3EA
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