Return to KLUBNL.PL main page
| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Demonstrating audibility of weak signals - utilty to play with. |
| From: | "Roelof Bakker" <[email protected]> |
| Date: | Sat, 12 May 2012 13:04:59 +0200 |
| In-reply-to: | <CAA8k23Tpk=77uv=VqenyRV52LDBMoKKfGrE9k32YA3EQ+A1tnA@mail.gmail.com> |
| References: | <CAA8k23Tpk=77uv=VqenyRV52LDBMoKKfGrE9k32YA3EQ+A1tnA@mail.gmail.com> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Opera Mail/11.64 (Win32) |
Hello Andy, Thank you for this little gem. I have been playing with it for a while.With a signal to noise ratio of -10 dB in 2500 Hz, I can copy a 10 WPM message with the output filter set to 2500 Hz. Estimating my brain ear system bandwidth as 50 Hz, the effective signal to noise ratio is 6.9 dB. This seems a bit on the low side, so the biological filter seems to be even narrower than 50 Hz. Setting the output filter to 20 Hz, results in armchair copy. The CW tone in this case is 300 Hz. 73, Roelof, pa0rdt |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | LF: Re: Droitwich off-air?, Clemens Paul |
|---|---|
| Next by Date: | Re: LF: Droitwich off-air?, Roelof Bakker |
| Previous by Thread: | Re: LF: Re: Demonstrating audibility of weak signals - utilty to play with., Andy Talbot |
| Next by Thread: | Re: LF: Demonstrating audibility of weak signals - utilty to play with., Andy Talbot |
| Indexes: | [Date] [Thread] [Top] [All Lists] |