Re: Practical CW Operation? #ubitxcw

David Wilcox <Djwilcox01@...>

A great CW filter is the CALF sold by John, KC9ON, at  You can use his stock set up or experiment with different variables if you are an audio nerd and the cost is very reasonable.  I have 3 or 4 different filters but his is my GoTo filter most of the time.

Dave K8WPE

On Apr 23, 2018, at 12:36 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:


There are some very interesting filters available in software where you can not only set the "center" frequency, but also the edges where the skirt "knees" are located. When I'm listening to code, I dial 'er down pretty tight as I find listening to the Big Bang during a CW session distracting rather than soothing. It all a matter of choice.

Jack, W8TEE

On Monday, April 23, 2018, 12:22:30 PM EDT, Buddy Brannan <buddy@...> wrote:

Hey Gordon,

Agreed about the super duper narrow filters. With all of the ways to crank down the bandwidth and peak the audio and reduce the noise and what not that are on my KX3, I rarely use much of that myself and, unless the bands are very crowded, open the receiver up some besides. Strange as it may sound, I find the background atmospheric noise soothing. Well, except maybe not so much the 80m static crashes. 

Now, after 30 years of being a ham, I’m interested in trying some kit building myself…it’s one aspect I feel like I’ve missed out on…especially now that I have a willing assistant :-) Still…being blind, these tiny parts make me a little nervous, and surface mount stuff is just right out. Anyway, think my YL and I can tackle a UBitx sometime soonish. 

Vy 73

On Apr 23, 2018, at 12:15 PM, Gordon Gibby <ggibby@...> wrote:

​I actually sorta like a wider bandwidth, unless I have a really interfering signal.

A couple decades ago I remember actually building a LC audio filter --- toroids & capacitors and maybe even a vacuum tube!!!   to run a headset.   I may even still have the thing.

Nowadays it is ducksoup to put something like that together with all the integrated circuits and I think I seem them advertized all over.    

Narrower than 500 hz makes my head hurt!

Cheers -- to each his own!!!!!


From: <> on behalf of Buddy Brannan <buddy@...>
Sent: Monday, April 23, 2018 12:04 PM
Subject: Re: [BITX20] Practical CW Operation? #ubitxcw
Ehhh! Listening to cw with a 2.someKHz filter is good for you! It will hone your cw listening skills and let you learn to pick the right signal out :-) 

In all seriousness, Gordon’s suggestion of an audio filter is a good one. While it’s not really the same as a filter in the receiver, they’re pretty good…or can be…and certainly can be very effective. I reckon that a DSP-based filter would be a bit beyond the capability of the Arduino. Also probably not exactly cost effective as compared to the rest of the radio. 

Do remember this is a really low-cost radio, and you probably won’t get Icom performance, or probably not even Xiegu performance, out of it, though I’m sure what you will get will be pretty decent…especially given how popular the rig seems to be. 

Vy 73, de KB5ELV

On Apr 23, 2018, at 11:53 AM, Gordon Gibby <ggibby@...> wrote:

Just add an audio filter to achieve whatever bandwidth you prefer would be my suggestion

On Apr 23, 2018, at 11:50, Braden Glett <bradenglett@...> wrote:

I've heard that the ubitx doesn't work very well for CW due to being too wide in the receiving end. How are some of you correcting this? Particularly, how can someone who can handle a soldering iron but is not an electronics whiz, adapt the ubitx for practical CW operation? 
Thanks and 73
Brady KD8ZM 

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