IC-703 CW Filters - QRP Forum at eHam.net

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eHam.net Forum : QRP : IC-703 CW Filters

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IC-703 CW Filters	Reply
by K8QLW on August 4, 2009	Mail this to a friend!
I'd appreciate anyone's thoughts / observations in regards to the Icom OEM 500Hz CW filter as opposeed to aftermarket filters such as INRAD and W4RT. Thanks much, K8QLW

RE: IC-703 CW Filters	Reply
by KB3RHV on August 5, 2009	Mail this to a friend!
I have used 703's with both. They are cheaper then the Icom's filter. The W4RT needs to be wired in, ware the Inrad filter is a direct fit. The Inrad filter is 400Hz ware the collins (W4RT) 500Hz Both sounded the same to me, so it now comes down to fit, and that's ware I liked the Inrad filter. It seemed to fit better since it directly soldered to the 703's board.

RE: IC-703 CW Filters	Reply
by KO1D on August 9, 2009	Mail this to a friend!
I used the INRAD filters and I think it was all of 15 to 20 minutes to install them. That was the first time I ever bothered to install a filter and man it makes a difference. From what I understand you want to find Crystal filters and not Ceramic ones. SOME of the OEM filters are ceramic. Dan S KO1D

RE: IC-703 CW Filters	Reply
by K8QLW on August 14, 2009	Mail this to a friend!
I have been hearing good things about INRAD filters. Sounds like a good choice. kent

RE: IC-703 CW Filters	Reply
by W2FFQ on October 24, 2009	Mail this to a friend!
Does the IC-703 Plus require you to solder in the optional filter, or is it plug-in? Related - is the stock ssb filter (2.4KHz) plug-in, or is that one soldered? Can it be easily replaced with something of higher quality or different spec's (is it really as poor quality as some reviews state)? Just wondering what kind of drill it would be to pull the stock ssb filter and upgrade at the same time I installed the cw filter. I am considering a 703Plus as my next rig for portable/temp setups. Thanks, Jeff W2FFQ

RE: IC-703 CW Filters	Reply
by VA3TSK on October 25, 2009	Mail this to a friend!
The filters are soldered. Taking the unit apart is a little fiddly, but not too difficult. I put in the W4RT CW filter myself, but W4RT advised that the stock SSB filter was a tight fit and a nuisance to get out. Apparently they often end up cutting it out when they upgrade for customers. As a result I decided to leave the stock SSB filter. Having said that, if you can get your hands on a proper vacuum desoldering tool (i.e., with a vacuum pump, not just the spring-loaded thing), I don't imagine it would be a huge problem to get out. The stock SSB filter seems OK to me, but I don't use SSB for voice all that much, mostly just for PSK31. At 5 or 10W, CW or PSK31 seems to be the way to go. For CW, you definitely want a CW filter; the DSP doesn't do AF filtering, just noise reduction. All in all, a nice radio, though.

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