[TenTec] Scads of used Icom IC-7300

[Jim Brown]

Barry,

Did you find the link to the data plots? It's two paragraphs above the 
Attenuation Tables. http://audiosystemsgroup.com/BandpassFilterData.htm

73, Jim

On Tue,9/13/2016 10:53 AM, Barry N1EU wrote:
> Nice report Jim!  Data is given for ham band rejection but folks are not
> going to find data for 41M and 49M shortwave band rejection.
>
> Barry N1EU
>
> On Tue, Sep 13, 2016 at 1:47 PM, Jim Brown <k9yc at audiosystemsgroup.com>
> wrote:
>
>> 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/BandpassFilter
>> Survey.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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>>>
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