K3: Actual bandwidth of Inrad 500hz 8-pole filter?

[Elecraft mailing list]

Would anyone know the actual bandwidth of the Inrad Model 728  500hz 8-pole
filter?  Such as, the 250hz 8-pole has an  actual bandwidth of 370hz, and
the 400hz 8-pole filter has an actual  bandwidth of 450hz.  (no graph is
shown for the Model 728 like it is  for the others)
 
Thanks & 73,
 
Dick- K9OM
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[Joe Subich, W4TV-4]

Looking through the other rigs that use Inrad 8 pole filters in the
8 - 9 MHz range, those filters for which curves are shown have 6 dB
bandwidths in the 580 - 595 Hz range.

73,

    ... Joe, W4TV


On 2015-07-26 1:21 PM, Dick via Elecraft wrote:

> Would anyone know the actual bandwidth of the Inrad Model 728  500hz 8-pole
> filter?  Such as, the 250hz 8-pole has an  actual bandwidth of 370hz, and
> the 400hz 8-pole filter has an actual  bandwidth of 450hz.  (no graph is
> shown for the Model 728 like it is  for the others)
>
> Thanks & 73,
>
> Dick- K9OM
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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>

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[wayne burdick]

There are accurate filter bandwidth plots on our website for each filter.

Wayne
N6KR


On Jul 26, 2015, at 12:01 PM, "Joe Subich, W4TV" <[hidden email]> wrote:

>
> Looking through the other rigs that use Inrad 8 pole filters in the
> 8 - 9 MHz range, those filters for which curves are shown have 6 dB
> bandwidths in the 580 - 595 Hz range.
>
> 73,
>
>   ... Joe, W4TV
>
>
> On 2015-07-26 1:21 PM, Dick via Elecraft wrote:
>> Would anyone know the actual bandwidth of the Inrad Model 728  500hz 8-pole
>> filter?  Such as, the 250hz 8-pole has an  actual bandwidth of 370hz, and
>> the 400hz 8-pole filter has an actual  bandwidth of 450hz.  (no graph is
>> shown for the Model 728 like it is  for the others)
>>
>> Thanks & 73,
>>
>> Dick- K9OM
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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[Joe Subich, W4TV-4]

http://www.elecraft.com/K3/K3_filter_plots.htm does not list the
*INRAD* 500 Hz (or 1500 Hz) filter(s).  Those filters are only
available directly from INRAD (http://www.inrad.net/home.php?cat=140)
- items 727 and 728.

73,

    ... Joe, W4TV


On 2015-07-26 3:06 PM, Wayne Burdick wrote:

> There are accurate filter bandwidth plots on our website for each filter.
>
> Wayne
> N6KR
>
>
> On Jul 26, 2015, at 12:01 PM, "Joe Subich, W4TV" <[hidden email]> wrote:
>
>>
>> Looking through the other rigs that use Inrad 8 pole filters in the
>> 8 - 9 MHz range, those filters for which curves are shown have 6 dB
>> bandwidths in the 580 - 595 Hz range.
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 2015-07-26 1:21 PM, Dick via Elecraft wrote:
>>> Would anyone know the actual bandwidth of the Inrad Model 728  500hz 8-pole
>>> filter?  Such as, the 250hz 8-pole has an  actual bandwidth of 370hz, and
>>> the 400hz 8-pole filter has an actual  bandwidth of 450hz.  (no graph is
>>> shown for the Model 728 like it is  for the others)
>>>
>>> Thanks & 73,
>>>
>>> Dick- K9OM
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
>

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[Scott Manthe-2]

This has some filter plots for various K3 filters:

http://www.nccc.cc/archived_meetings/pdf/K3%20Filters,%20Jan%202009.pdf

73,
Scott N9AA


On 7/26/15 3:28 PM, Joe Subich, W4TV wrote:

>
> http://www.elecraft.com/K3/K3_filter_plots.htm does not list the
> *INRAD* 500 Hz (or 1500 Hz) filter(s).  Those filters are only
> available directly from INRAD (http://www.inrad.net/home.php?cat=140)
> - items 727 and 728.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 2015-07-26 3:06 PM, Wayne Burdick wrote:
>> There are accurate filter bandwidth plots on our website for each
>> filter.
>>
>> Wayne
>> N6KR
>>
>>
>> On Jul 26, 2015, at 12:01 PM, "Joe Subich, W4TV" <[hidden email]>
>> wrote:
>>
>>>
>>> Looking through the other rigs that use Inrad 8 pole filters in the
>>> 8 - 9 MHz range, those filters for which curves are shown have 6 dB
>>> bandwidths in the 580 - 595 Hz range.
>>>
>>> 73,
>>>
>>>    ... Joe, W4TV
>>>
>>>
>>> On 2015-07-26 1:21 PM, Dick via Elecraft wrote:
>>>> Would anyone know the actual bandwidth of the Inrad Model 728  
>>>> 500hz 8-pole
>>>> filter?  Such as, the 250hz 8-pole has an  actual bandwidth of
>>>> 370hz, and
>>>> the 400hz 8-pole filter has an actual  bandwidth of 450hz. (no
>>>> graph is
>>>> shown for the Model 728 like it is  for the others)
>>>>
>>>> Thanks & 73,
>>>>
>>>> Dick- K9OM

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