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Data Filter for K3

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Chris W7CTH

Data Filter for K3

To start off with, what would be the filter to add for Data?
Thanks
Chris W7CTH

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Joe Subich, W4TV-4

Re: Data Filter for K3

> To start off with, what would be the filter to add for Data?

That depends on the data mode and your operating style (FSK vs.
AFSK or click on the waterfall vs. tune the signal).

For traditional FSK RTTY the best overall choice among currently
available filters is the INRAD/Electraft "250 Hz, 8-pole" filter.
The second choice is probably the INRAD/Elecraft "400 Hz, 8-pole"
filter. The two filters are two close in performance to justify
both in the same rig and the "250 Hz" filter is too narrow for
general (non-contest) CW operation so the edge probably goes to
the "400 Hz, 8-pole" filter unless you're a RTTY contest op.

If you're an AFSK/PSK "click in the waterfall" type operator,
either the 2.7 or 2.8 KHz filter will give you plenty of room
to click.

73,

... Joe, W4TV

On 7/18/2010 5:14 PM, Chris Hembree wrote:

> To start off with, what would be the filter to add for Data?
> Thanks
> Chris W7CTH
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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Jack Brabham KZ5A

Re: Data Filter for K3

How about if you are a "tune in the signal|" type and run various data
modes up to 500 hz wide MSK modes?

Looks like the choices are 500 and 1000 hz.

73 Jack KZ5A

On 7/18/2010 4:31 PM, Joe Subich, W4TV wrote:

> > To start off with, what would be the filter to add for Data?
>
> That depends on the data mode and your operating style (FSK vs.
> AFSK or click on the waterfall vs. tune the signal).
>
> For traditional FSK RTTY the best overall choice among currently
> available filters is the INRAD/Electraft "250 Hz, 8-pole" filter.
> The second choice is probably the INRAD/Elecraft "400 Hz, 8-pole"
> filter. The two filters are two close in performance to justify
> both in the same rig and the "250 Hz" filter is too narrow for
> general (non-contest) CW operation so the edge probably goes to
> the "400 Hz, 8-pole" filter unless you're a RTTY contest op.
>
> If you're an AFSK/PSK "click in the waterfall" type operator,
> either the 2.7 or 2.8 KHz filter will give you plenty of room
> to click.
>
> 73,
>
> ... Joe, W4TV
>
> On 7/18/2010 5:14 PM, Chris Hembree wrote:
>> To start off with, what would be the filter to add for Data?
>> Thanks
>> Chris W7CTH
>>
>>
>>
>>
>> ______________________________________________________________
>> 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
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Joe Subich, W4TV-4

Re: Data Filter for K3

> How about if you are a "tune in the signal|" type and run
> various data modes up to 500 hz wide MSK modes?

There are many choices depending on how close the data modes push
the 500 Hz bandwidth. Elecraft's 500 Hz, 5-pole filter is very close
to 500 Hz at the -6 dB points (mine all measure 480 - 490 Hz).
INRAD have a 500 Hz, 8-pole filter but do not publish any curves
or specific -6dB/-60dB data but the one 8-9 MHz 500Hz, 8-pole filter
for which they do publish curves is about 590 Hz wide at -6dB. The
INRAD/Elecraft 1000 Hz, 8-pole filter is an option as are any of the
"narrow" SSB filters including the INRAD 1500 Hz, 8-pole, and
INRAD/Elecraft 1800 or 2100 Hz, 8-pole filters.

73,

... Joe, W4TV

On 7/18/2010 5:47 PM, Jack Brabham wrote:

> How about if you are a "tune in the signal|" type and run various data
> modes up to 500 hz wide MSK modes?
>
> Looks like the choices are 500 and 1000 hz.
>
> 73 Jack KZ5A
>
>
> On 7/18/2010 4:31 PM, Joe Subich, W4TV wrote:
>> > To start off with, what would be the filter to add for Data?
>>
>> That depends on the data mode and your operating style (FSK vs.
>> AFSK or click on the waterfall vs. tune the signal).
>>
>> For traditional FSK RTTY the best overall choice among currently
>> available filters is the INRAD/Electraft "250 Hz, 8-pole" filter.
>> The second choice is probably the INRAD/Elecraft "400 Hz, 8-pole"
>> filter. The two filters are two close in performance to justify
>> both in the same rig and the "250 Hz" filter is too narrow for
>> general (non-contest) CW operation so the edge probably goes to
>> the "400 Hz, 8-pole" filter unless you're a RTTY contest op.
>>
>> If you're an AFSK/PSK "click in the waterfall" type operator,
>> either the 2.7 or 2.8 KHz filter will give you plenty of room
>> to click.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>> On 7/18/2010 5:14 PM, Chris Hembree wrote:
>>> To start off with, what would be the filter to add for Data?
>>> Thanks
>>> Chris W7CTH
>>>
>>>
>>>
>>>
>>> ______________________________________________________________
>>> 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
>>>
>> ______________________________________________________________
>> 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
>>
>
> ______________________________________________________________
> 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
>

Jack Brabham KZ5A

Re: Data Filter for K3

Hi Joe,

Thanks for the reply.

I have a 6.0 and a 1.8 that I expect to swap out for the 1.5 for SSB
contesting, and am having a lot of fun between contests exploring
various data modes, all of which, except PSK31 etc, are fairly new to me.

The next addition to my K3 is going to be a better filter than the
1.8/1.5 for all round data usage. Considering that my CW skills have
never risen to "contesting" level, my CW operations are all casual, so
this will might end up being the narrowest filter in the radio.

Sounds like the 500 is probably wide enough for 500 hz modes like Olivia
8/500, which is my favorite keyboard rag chew mode, so would probably
well serve the purpose I have in mind.

That would leave the last slot for a 2.1 or a 250 later, TBD.

73 Jack KZ5A

On 7/18/2010 5:24 PM, Joe Subich, W4TV wrote:

> > How about if you are a "tune in the signal|" type and run
> > various data modes up to 500 hz wide MSK modes?
>
> There are many choices depending on how close the data modes push
> the 500 Hz bandwidth. Elecraft's 500 Hz, 5-pole filter is very close
> to 500 Hz at the -6 dB points (mine all measure 480 - 490 Hz).
> INRAD have a 500 Hz, 8-pole filter but do not publish any curves
> or specific -6dB/-60dB data but the one 8-9 MHz 500Hz, 8-pole filter
> for which they do publish curves is about 590 Hz wide at -6dB. The
> INRAD/Elecraft 1000 Hz, 8-pole filter is an option as are any of the
> "narrow" SSB filters including the INRAD 1500 Hz, 8-pole, and
> INRAD/Elecraft 1800 or 2100 Hz, 8-pole filters.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 7/18/2010 5:47 PM, Jack Brabham wrote:
>> How about if you are a "tune in the signal|" type and run various data
>> modes up to 500 hz wide MSK modes?
>>
>> Looks like the choices are 500 and 1000 hz.
>>
>> 73 Jack KZ5A

Dunc Carter - W5DC

Re: Data Filter for K3

The 500 Hz filter will work for 500 Hz Olivia but you'll probably need
to tune carefully.

Dunc, W5DC.
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