[Elecraft] Microphones for the K3

[Stan Rife]

	Wayne, are we going to be able to use the existing microphones for
the K3? I have the mobile mic for the K2, as well as the desk mic and the
Heil headset all wired for Kenwood.

Stan Rife
W5EWA
Houston, TX
K2 S/N 4216




-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill W5WVO
Sent: Monday, April 30, 2007 12:05 AM
To: wayne burdick
Cc: elecraft at mailman.qth.net
Subject: [Elecraft] Re: K3 S meter 

Hmmm... I just went back through my reflector mail as well as the published 
Omni-VII literature, and I can't find anywhere it says 6 dB per S-unit. I 
could have swore that I read that. Could be I assumed it, though... That 
used to be one of the "standards" in days gone by... LONG gone by...

Just did the math based on S9 = 50 uV, and if you figure 1 uV for S0, you 
get 3.775 dB per S-unit, pretty much what you said. If you use 6 dB per 
S-unit, a 0.25 uV signal (nominal minimum detectable) would be between an S1

and an S2. Is this "right"? On the face of it, it doesn't seem so -- but if 
you go by the old-time verbal strength descriptions for the S scale, an S1 
is a "barely perceptible" signal. Neglecting any atmospheric noise floor for

the moment, a barely perceptible signal in a modern HF receiver would be 
about 0.25 uV, so by these lights, maybe the 6 dB per S-unit isn't so far 
off.

Maybe 5 dB makes the most sense, since this places the minimal detectable 
signal near S0, and anything above that would move the S-meter (including 
the atmospheric noise floor). I think that would be my vote.

Bill / W5WVO


wayne burdick wrote:
> I think 3.5 to 4 dB per S-unit is closer to operator expectations,
> Bill, but I'm sure TT has their reasons.
>
> We do agree on 50 uV = S9. Whether the S-meter compensates for the
> preamp and attenuator is an interesting subject; we might provide a
> menu entry to turn this on/off.
>
> 73,
> Wayne
> N6KR
>
>
> On Apr 29, 2007, at 5:15 PM, Bill W5WVO wrote:
>
>> Wayne,
>>
>> Just as a data point, in case you don't know -- the Omni-VII features
>> a calibrated S-meter (50 uV = S9, 1 S-unit = 6 dB) on all bands, and
>> it always reads the same for a given signal level regardless of the
>> state of pre-amps or attenuators switched in/out.
>
>> ---
>
> http://www.elecraft.com 


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