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Author Topic: cw-filter for ic-718  (Read 473 times)
HB9RVS
Member

Posts: 8




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« on: June 15, 2003, 10:10:37 AM »

what's the better choice: 500Hz or 250Hz? Who has experience?
73 Dave
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KD5SCG
Member

Posts: 19




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« Reply #1 on: June 15, 2003, 07:30:36 PM »

I have a 500 hz filter in my radio. and I've never had any trouble with qrm when I switch it in. If you are getting QRMed with a 500hz filter, you should probably change frequencies anyway. Besides, I think that audio sounds better on a 500 hz filter.
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NI0C
Member

Posts: 2403




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« Reply #2 on: June 16, 2003, 02:42:27 PM »

Since (assuming the signal is clean, not chirpy) CW is a single tone, audio response is not a concern.  The narrower filters do tend to have more insertion loss which can be noticeable on the higher bands (12m & 10m).  Also, tuning through a pileup also requires more care with the narrow filters.  However, I still prefer a narrow CW filter (I use an INRAD 125Hz), especially on the low bands.  The insertion loss is made up for by the improved signal-to-noise ratio and attenuation of QRM from adjacent signals.  This is my personal preference-- not for everybody of course, but CW has always been my main mode.
 
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HB9RVS
Member

Posts: 8




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« Reply #3 on: June 17, 2003, 06:46:04 AM »

Hi
Thanks for the infos. I took the 500Hz-filter

73 Dave
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