[SFDXA] N4IS Carlos' Acoustic CW Speaker/Filter Demonstration - SFDXA Meeting Tonight

[Bill]

BTW: Carlos, N4IS has 308(?) confirmed on 160...few in the world have 
more...he has been a member of SFDXA for about 25+ years. His company 
manufactured and sold the Waller Flag for years...

Bill W2CQ



On 5/7/2025 7:10 AM, Bill wrote:
> I hope everyone is able to see Carlos N4IS, presentation of an 
> experimental acoustic CW Filter he calls the 3-S.....at the SFDXA 
> Meeting tonight.
>
> I have been fortunate to have been using a prototype for a couple of 
> months now. It is not anything like any filter you've seen before 
> visually or mechanically. Here is a note I sent to Carlos a short 
> while ago regarding an experience I had using it.
>
> "Carlos I just had to tell you...the TX9A today was just a bit too 
> weak to copy on 24.894. But with the 3-S online I was able to hear my 
> call and work him...then an hour later he's on 18074. Once again way 
> too weak...I called him and he came back to someone... I just could 
> not make out the letters let alone the callsign...*/then I turned the 
> 3-S on, I tuned it, and I heard my call, it was me he was 
> calling/*!...I quickly sent my report and got the "TU". So */in the 
> log/* on both bands thanks to the 3-S."
>
> I planned on being there tonight, but something unexpected came up 
> yesterday last minute, and I cannot attend. I wanted to relay this 
> quick story to attest to Carlo's remarkable years of research and 
> findings.
> *
> /AGAIN: /*/*It is not anything like any filter you've seen before 
> visually or mechanically.*/
>
> Attend The Meeting or at least the ZOOM for this presentation
>
> Bill W2CQ
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