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 > [EMAIL PROTECTED] > ----- Original Message ----- > From: "Axel Kaiser" <[EMAIL PROTECTED]> > To: "Elecraft Reflector" <[email protected]> > 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 > > > > _________________________________________________________________ > Discover the new Windows Vista > http://search.msn.com/results.aspx?q=windows+vista&mkt=en-US&form=QBRE_______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > > -------------------------------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG. > Version: 8.0.100 / Virus Database: 269.23.20/1452 - Release Date: > 5/17/2008 > 6:26 PM > > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > -- View this message in context: http://www.nabble.com/RTTY-filter-for-K3-tp17300221p17303427.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
