[Elecraft] K3: best roofing filter on RTTY

[Ted Edwards W3TB]

I also like the 400 Hz filter, but when tuning around like in this
weekend's CQ WPX RTTY then I went much wider.
With that width came lots of noise.  What is a good idea on that?
And thanks ahead of time.

On Mon, Feb 16, 2015 at 12:47 PM, <dmoes at nexicom.net> wrote:

>
>
>
> 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.
>>>>
>>>
>>>
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-- 
73 de Ted Edwards, W3TB and GØPWW

and thinking about operating CW:
"Do today what others won't,
so you can do tomorrow what others can't."