Hand made CW audio filter

[@thermionictetrode]

Sounds very handy indeed! Sounds mostly good for those times when you want to make sure to get the middle of what the other station is saying and the beginning/end is less important so that's when you can drop/pick up the speaker.

[@turinskiboy]

I have seen a filter described by Steve Ellington, where he demonstrates the use of tuned length and diameter tubing to affect the frequency response of a speaker for the same intended application. Obviously there's more than one way to skin a cat, as they say. hi hi.

[@101blog]

Good one Peter truly hand made!! Wonder if you had an enclosure with movable baffles you could do similar in a more permanent fashion?!

[@Steve-GM0HUU]

I recall reading an article about building audio cavity resonators for CW reception - can't remember where. I do wonder if everyone's ears may differ slightly. I sometimes find I can pick out weak CW more easily if I increase audio bandwidth and introduce noise! Seems to be at odds with theory I know but I find the pure CW tone somehow stands out from the noise even if it's at a lower level than the noise. In the video, I could hear the CW better before Peter cupped his hands round the speaker. I do think it is a shame that amateur receivers don't usually have a simple tone control. I know a lot of modern rigs have RX audio multichannel equalisers but sometimes I long for a simple front panel tone control on ham transcievers. This used to be standard on many domestic and comms receivers. It may be a good project to build an external speaker with a tone control or maybe even a little inline tone control circuit for use with headphones?

[@thuff3207]

This is way a good audio Enginer is worth knowing. Thank you for the video.

[@gerard.pardoel4295]

Very good experience, you make one acoustical cavity with your hand. ... (sorry for me poor language).

[@jeffryblackmon4846]

Now, adjust the RX gain! Fine idea, OM. de W8YI

[@einstein.1869]

And you key how? With your nose?

[@flexairz]

Left foot

[@Steve-GM0HUU]

I have a theory that humans are not evolving anywhere near fast enough to keep up with technology. We need to evolve so that we have maybe 4 hands - two for cupping the speaker, one for keying and one for log entry.... Actually, six might be better so that you can twiddle with some transciever controls at the same time 🤔.

[@PaulaBean]

@@Steve-GM0HUU Insects have 6 legs, perhaps they will eventually evolve into the efficient CW operator you just described ;-)