Hello all I am just designing a new RX for 136 kHz band. It will have IF on 1 MHz with high quality x-tal filter with bandwidth 200 Hz. The main selectivity will by obtained on AF with passive filter
Petr asked: What bandwidth do you use and what is the experience?< I use 100 Hz bandwidth for normal CW as well as for Slow CW. I use the 100 Hz filter of my MV62 level meter, which is a 200 kHz mech
Hello all I am just designing a new RX for 136 kHz band. It will have IF on 1 MHz with high quality x-tal filter with bandwidth 200 Hz. The main selectivity will by obtained on AF with passive filte
To All from PA0SE Narrow bandwidth filters do not have to ring provided they are of the phase-linear type (constant group delay in the passband). I use a home made passive phase-linear filter with a
I use a home made passive phase-linear filter with a bandwidth of 30Hz and centre frequency of 1000Hz. It can pass up to 24 wpm without trouble (unfortunately the operator can't ...) The filter has f
Could you post a brief text summary of your design? 73, Bob ZL2CA PA0LQ filter descriptions: http://www.alg.demon.co.uk/radio/136/af_filter.htm http://home5.swipnet.se/~w-54761/pa0lq_filter.htm 73 Ch
Christer and the group. I was delighted to get the two URL's containing the 30 Hz filter and noise blanker. You might remember some years ago the "HDO" phase linear filter. That was when I was W6HDO
Further update on the filters mentioned below. I am convinced that any filter has enough tolerance variations that experimental "tweeking" is necessary for minimum ringing. Most of us are using 800 h
