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Author Topic: Icom Filters  (Read 309 times)
N1ZHE
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Posts: 68




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« on: July 14, 2005, 07:31:59 AM »

I have an Icom 706 MkIIG.

I can install up to two IF filters in this radio.

One filter slot holds a 500 Hz CW filter.

I would like to put a SSB filter in the other, but I have no experience with this.

Should I get the 2.8 kHz or the 1.9 kHz filter??

Sincerely,

David, N1ZHE
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W4TME
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Posts: 299




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« Reply #1 on: July 14, 2005, 08:01:22 AM »

Depends on how and where you use the rig on SSB.  If you contest with it or use it for digital modes, I'd get the narrow filter.  If you rag chew, then get the wide filter.

If you use the rig in a high noise environment, then the narrow filter may help.  Depends on your preference.

I installed the narrow filter in my 706MKIIg

-Tim
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K6AER
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Posts: 3471




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« Reply #2 on: July 14, 2005, 09:30:13 AM »

You did not mention if you were using the radio at home or in a mobile operation. For mobile operation I would stick with the 2.8 kHz filter. The narrow filter cuts down the verbal intelligence you would need from the higher audio response. A narrow filter will increase your received carrier to noise ratio by a few dB but in a mobile application, the road noise and other interference sources will mask this advantage. In a base operation you can derive some benefit from the narrow filter but I only use the very narrow SSB filter under the most extreme contest conditions.  
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AA4PB
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« Reply #3 on: July 14, 2005, 09:36:09 AM »

The standard filter is 2.4KHz so the optional 2.8 is wider and the optional 1.9 is narrower. I went for the 1.9 because I have no need for the bandwidth to be wider than the standard. I wind up leaving it in the 1.9KHz position most of the time.
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AA4PB
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« Reply #4 on: July 14, 2005, 09:37:38 AM »

I operate the 706 strickly mobile by the way.
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N1ZHE
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Posts: 68




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« Reply #5 on: July 14, 2005, 09:43:36 AM »

To clarify, I use my 706 strictly as a base station, not mobile.

Thanks!

David, N1ZHE
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K5LXP
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« Reply #6 on: July 14, 2005, 10:24:25 AM »

Adding the 1.9kHz filter didn't help as much I'd hoped in crowded band conditions.  I find that futzing with the DSP and IF shift could be just as effective.  I also have the 250Hz CW filter.  I would judge it to be a tad too narrow for general operating but it works wonderfully for crowded bands like during Field Day.

Mark K5LXP
Albuquerque, NM
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AD7DB
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« Reply #7 on: July 15, 2005, 07:25:57 AM »

I found that the narrow SSB filter really helps on bands like 75m and 40m. I use one of the old style ClearSpeech DSP speakers. With that, I can turn off the so-called DSP in the 706, but I leave the ANF function ON. Armed with all that and the narrow filter I do quite well.

I guess everyone will have a different viewpoint about filters.
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KL7IPV
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Posts: 984




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« Reply #8 on: July 18, 2005, 10:01:13 PM »

Check the CQ Magazine for July 2005 on page 56. Maybe that will help.
73,
Frank
KL7IPV
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