[Elecraft] L34 -- is this what it sounds like?

[John Huffman]

Andy -

That was my experience when I went back to redo L34.  The peak remained and
I tuned to get the hiss as low as possible.  There was no dip, but it
averaged just a bit lower near the top of the can.

73 de NA8M
John

----- Original Message -----
From: "Wallace, Andy" <awallace@mc.com>
To: "'Elecraft'" <>
Sent: Saturday, February 15, 2003 1:08 PM
Subject: [Elecraft] L34 -- is this what it sounds like?


> OK, the recent talk about L34 made me go back and take
> a look at it with Spectrogram.
>
> If I tune in the birdie at 7 MHz, I hear it quite clearly.
> It shows up as a nice peak in Spectrogram, when I center
> it carefully in the filter (at the sidetone freq).
>
> If I set the volume level such that the birdie peak is
> at -10 dB, then the shoulders of the bandpass are down
> around -50 dB.
>
> What I hear, when I tune L34 down from the top to the bottom
> of the can, is an increase in hiss volume which then sweeps
> down in frequency. This seems to match what shows on Spectrogram.
> I don't see the birdie peaking any higher at all.
>
> Is L34 this subjective? To me, the s/n ratio seems to be best with
> L34 almost at the top of the can, but I am surprised I am not seeing
> any kind of "peaking" of the birdie signal strength.
>
> Andy
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