[TenTec] Scads of used Icom IC-7300

[shristov]

"rick at dj0ip.de" <Rick at 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