Not really a RTTY contester, but when I do play, I am constantly bothered by my rx filtering setup. I currently run a pair of IC7410's in LSB (AFSK) mode. On RTTY I am currently SO1R, but I know how
An IF bandwidth of 600 Hz is ideal with our modern software decoders. (Narrower bandwidth introduces phase shift that degrades copy error rate.) Older radios often don't allow narrow filtering in SSB
On 2/16/2021 1:27 PM, Ed Muns wrote: I do like lower tones and typically use 915/1085 which is less fatiguing over long periods. OTOH, their TX audio harmonic is still within the normal 2 kHz bandwid
I am sure that is true on a quiet band. I wish that I could find a 600hz opening anywhere on 20m in last weekend's contest. Any QRM in my passband makes decoding very difficult. John KK9A An IF bandw
I was cranked down to 200 hz and would have gone tighter if I could.....btw, congrats John on what appears to be a first place finish, I just couldnt get much going with low power this weekend.... Se
Not my experience. 2Tone handles QRM better than the group delay from a narrow filter.73,Ed W0YK -- Original message --From: john@kk9a.com Date: 2/17/21 17:37 (GMT-08:00) To: cq-contest@contesting.
Not necessarily, and top RTTY ops like Ed run wide as their default, narrowing only when a strong signal moves in real close. That's how I've done it for a while. 73, Jim K9YC (KU6W in WPX) _________
Like Ed, I generally run a wider roofing filter and rely on the decoder software to do the close in filtering. It takes a while to wrap your head around the idea that what we hear as humans is not r
Hi Jim, You're right, but during contests, my default filters are 300 hz with the FTDX5000 and 250 hz with the IC7600, 3 decoders for each transceivers and the results are between 0,1 and 0,3 % of c