[Elecraft] RTTY filter for K3

[K3KO]

Please turn on the K3 dual peak RTTY filter and tell us what you see then.
Brian/K3KO


n4lq wrote:
> 
> Axel
> I was the first to respond to your question. I told you that I was
> listening 
> to RTTY through the 200 Hz, 5 pole filter and it worked fine. Then the 
> experts came on here and using many words, explained why it couldn't work 
> because it is too narrow. Maybe they do not actually have the filter but I 
> do.
> Looking at the waterfall on MixW, 200Hz filter engaged, a RTTY signal
> easily 
> fits within the waterfall's passband with a little room on either side.
> The 
> vertical stripes of the RTTY signal do not quiet reach the outer edge of
> the 
> waterfall which tells me that the "data" is not being chopped off. Both
> weak 
> and strong RTTY signals seem perfectly copyable.
> No I would not use this in a contest unless I had a bandscope so I could 
> find signals. I have ordered the LP-PAN which should take care of that 
> little detail.
> 73
> 
> Steve Ellington
> N4LQ at insightbb.com
> ----- Original Message ----- 
> From: "Axel Kaiser" <dl2sca at hotmail.com>
> To: "Elecraft Reflector" <elecraft at mailman.qth.net>
> Sent: Sunday, May 18, 2008 4:14 AM
> Subject: [Elecraft] RTTY filter for K3
> 
> 
> 
> 
> 
> 
> To all you filter aficionados,
> 
> first of all thank you very much for all your detailed answers to my 
> original question, which roofing filter ist best for RTTY operation of the 
> K3. Lots of very detailed and informative answers were given and even a 
> general discussion on this issue among several others was started. But to 
> tell you the truth, I am still somewhat uncertain, which filter to order 
> with my K3.
> One of my theory books about HF technology, modulation, bandwidth and so 
> forth, tells me, that the necessary bandwidth for a 170 Hz shift RTTY
> signal 
> should be around 320 Hz. Now some of you guys write, that you are using a 
> 250 Hz filter for RTTY operation. A 250 Hz filter though has this 250 Hz 
> (ok, a few Hz more in reality) bandwidth at - 6dB attenuation, which means 
> that the actual bandwidth at about 0 db is even less.
> So my understanding for a 170 Hz shift RTTY operation is, to use a filter
> of 
> at least 400 - 500 Hz (at -6dB) in order to get all the information
> through 
> the filter. This I can confirm also with my current OMNI VI+ which does
> not 
> allow me to copy RTTY signals with a 250 Hz filter . So please, where is
> the 
> point which I am missing with the K3, that you can work weak RTTY signals 
> with a 250 Hz roofing filter??
> 
> Best 73 de
> 
> Axel, DL3ZH
> 
> 
> 
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