[Elecraft] Data Filter for K3

[Joe Subich, W4TV]

 >    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INRAD have a 500 Hz, 8-pole filter but do not publish any curves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
>>>
>>>
>>>
>>>
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