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Author Topic: CW Filters  (Read 3733 times)
N2DVD
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Posts: 2




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« on: April 26, 2013, 03:44:39 PM »

I have a ICOM IC-718 and need to put a CW Filter in it. My question is this, will a 250hz by ICOM be too narrow? Will it make my radio ring? Please advise ... thank you in advance.  73 John
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VA7CPC
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« Reply #1 on: April 26, 2013, 08:35:22 PM »

250 Hz is as narrow as you should go.  It should be OK.

I have an IC-706 with a 350-Hz filter (sold as "RTTY / CW" filter).  It works quite well, no ringing at all.  That would be a good filter for the IC-718, if you can get one.

The choice of filter bandwidth is personal and subjective.  So ultimately, you buy something and live with it for a while.

.               Charles
   

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W1JKA
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« Reply #2 on: April 27, 2013, 05:50:25 AM »

Check out the 4SQRP Hypermite CW filter,cheap and they work,either internal or external.
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KC7YE
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Posts: 93




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« Reply #3 on: April 27, 2013, 05:51:38 AM »

I put a 400 hz in my IC 718, made the low end rig into an acceptable CW rig. Not a high end contest rig for sure but I don't have to have the manual open on operating desk like did with FT 897.
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AD5X
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« Reply #4 on: April 27, 2013, 08:35:08 AM »

I prefer the 250Hz filter.  No ringing.  I normally tune around with the SSB filter, then switch in the CW filter to operate.
Phil - AD5X
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2E0OZI
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Posts: 269




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« Reply #5 on: April 27, 2013, 09:47:47 AM »

Need to get me a W4RT 500Hz filter and that will just about make my 718 perfect for my casual style of non-contest CW.  Smiley I've been going for a year on CW and enjoyed it greatly, but as a new guy there are times when adjacent stations get on my goat.
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George Orwell
KB9BVN
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Posts: 116




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« Reply #6 on: April 27, 2013, 11:03:50 AM »

When contesting I usually use a 200 hz filter, 400hz for every day listening...700hz when I can't find anyone to work.  I have a Elecraft K2.

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N2DVD
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« Reply #7 on: April 27, 2013, 03:19:40 PM »

I would like to thank everyone for their valued responses.  73 .. John
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N5XM
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Posts: 242




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« Reply #8 on: April 27, 2013, 06:17:00 PM »

I used a friends 718 for about three weeks, but it didn't have a CW filter in it, and the front end was as wide as a barn door.  A CW filter and I might have brought that rig.  I don't remember, but can you adjust the DSP bandwidth on that radio?  I imagine you can.  I keep the bandwidth on my 7600 at 200-300 Hz, and use the PBT to slide a little sideways when I need to, and it works great.  I think the 250 would be the way to go, but you'd be all right either way.  It sure is a cool looking little rig.
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W8JX
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« Reply #9 on: April 27, 2013, 09:07:56 PM »

I would like to thank everyone for their valued responses.  73 .. John


I would suggest a 500hz as it is wide enough for RTTY and some advanced digital modes too.
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NO2A
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« Reply #10 on: April 28, 2013, 10:26:22 AM »

I use a 500hz filter in my FT-857D and I`ve found it`s just right for 95% of operating. If I was contesting or field day maybe a 300hz would be necessary. Or if you`ve got two strong stations next to you.
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KD8IIC
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Posts: 151




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« Reply #11 on: April 29, 2013, 08:52:43 AM »

 I have an IC718 with the 250hz filter in the !st i.f. and it is fine business.I also have a Timewave DSP599+. With the Timewave on the 250hz filter on or off is of no consequence. Save the install hassle and go with the Timewave, that way when you trade up or add another rig you already are filtered.  73 lane
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GILGSN
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Posts: 199




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« Reply #12 on: April 29, 2013, 09:19:29 AM »

It's a bit narrow.. If you're into contests, sure, otherwise, get a 400 or 500Hz filter.

Gil.
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