[TenTec] Scads of used Icom IC-7300

[Jim Brown]

Several years ago, I measured a half dozen or so bandpass filter sets 
that I was able to borrow for NCCC members, and some that I owned. I 
wrote up a report, that was published in the National Contest Journal 
and the NCCC newsletter, "The Jug." That report, with links to the 
actual data for each filter on each band, is on my website. 
http://k9yc.com/BandpassFilterSurvey.pdf  The filter sets I tested were 
ICE, Dunestar, W3NQN sold by Array Solutions, and the very nice TXBPF 
set designed by Bob Henderson, 5B4AGN, based on a W3NQN design, and for 
which Bob did several group purchases. In addition, Bob sent me data 
that he measured on 4O3A filters rated for use on power amp outputs, and 
that data is in the report.

73, Jim K9YC

On Tue,9/13/2016 1:17 AM, shristov wrote:
> "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
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