Re[2]: [Elecraft] Keying Bandwith Modification: Done

[Martin]

ermqn> From: "Ron D'Eau Claire" <rondec@easystreet.com>
ermqn> To: <elecraft@mailman.qth.net>
ermqn> Subject: RE: [Elecraft] Keying Bandwith Modification: Done
ermqn> Date: Thu, 25 Mar 2004 13:30:11 -0800

ermqn> The files ARE impressive, but raise some questions.

ermqn> Knowing how the windows sound player can add artifacts and not knowing =
ermqn> what the test setup was, I took a look at the spectral distribution of the =
ermqn> two files and was surprised:

ermqn> At 700 Hz from the carrier:

ermqn> Before the mod energy is down -40 dB
ermqn> After the mod it's only down -25 dB

ermqn> At 1.5 kHz from the carrier:

ermqn> Before the mod, down -50 dB
ermqn> After the mod, down - 40 dB

ermqn> At 2 kHz from the carrier:

ermqn> Before the mod, down -60 dB
ermqn> After the mod, down -42 dB.

ermqn> No doubt the mod offers an IMPROVEMENT in clicks! So I'm suspicious of =
ermqn> the sounds of clicks in these files. I got interested because my as-yet
ermqn> unmodified K2 sounds more like  the "after" than the "before" file.

Volume of the TS 850 was cranked up to high in the 2nd file.
One can even hear the difference in volume .

I should have checked for equal audio output before recording it.


--

Best regards
Martin  K2 #2706