[Elecraft] K3: best roofing filter on RTTY

[dmoes at nexicom.net]

David Moes
VE3DVY

Since I find that the 8 pole 250 Hz filter is really a bit wider   I 
tell my K3 in filter setups its 300hz It  works fine for me this way 
including on RTTY

During the WPXRTTY this weekend   I had good luck copying weak signals 
right beside a power house signal using the 250hz filter.
>
> --- Original message ---
> Subject: Re: [Elecraft] K3: best roofing filter on RTTY
> From: Jim's Desktop <w0eb at cox.net>
> To: <elecraft at mailman.qth.net>
> Date: Monday, 16/02/2015  9:49 AM
>
> The narrowest filter I have in both receivers is the 400 Hz one.  I
> borrowed a K3 that had a 250 Hz filter in it once and tried it on 
> RTTY.
> It works, but it's right on the margin of being too narrow.  If 
> someone
> is using one of the older Packet TNC's that have RTTY mode in them 
> (they
> used 200 Hz shift instead of 170 and there are still a lot of them out
> there) it's really hard to get them tuned in with a 250 Hz filter,
> especially in weak signal/selective QSB situations.  The 400 Hz filter
> doesn't seem to have that limitation though it does let slightly more
> noise in (easily handled with the DSP filters anyway.
>
> Jim - W0EB
>>
>>
>> On 2/15/2015 11:35 PM, David Cole wrote:
>>>
>>> Hi,
>>> I ordered and use the 400 for RTTY, I suspect the 250 is a bit to
>>> narrow.
>>