S-Meter calibration (K2)

[oe9fwv]

hello all,

I have a question regarding s-meter calibration. When I feed the 50µV signal
into the K2, do I have to switch the preamp on or off for a correct S9
reading?

This was the only question left after reading this:
http://www.mail-archive.com/elecraft@.../msg08561.html

73! de Werner
OE9FWV


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[Don Wilhelm-4]

Werner,

There is no 'correct' answer, each operator can make his own choice on that.
I usually set the S-meter on 40 meters with a 50 uV signal and the
preamp off.  Other bands may vary somewhat, but this seems to give me
the most consistent behavior.  Note that I usually operate with the
preamp on for 20 meters and higher bands.  Whether I use the preamp or
not on 30 meters depends on the state of atmospheric noise at the time.  
If atmospheric noise is evident on any band without the preamp, using
the preamp will not be a benefit.  Switch the antenna on and off to tell
how much atmospheric noise is present - if the receiver noise level
increases when the antenna is connected, then the atmospheric noise is
higher than the receiver noise floor and more preamp gain will not be of
benefit for hearing signals.

73,
Don W3FPR

Dr. Werner Furlan wrote:

> hello all,
>
> I have a question regarding s-meter calibration. When I feed the 50µV signal
> into the K2, do I have to switch the preamp on or off for a correct S9
> reading?
>
> This was the only question left after reading this:
> http://www.mail-archive.com/elecraft@.../msg08561.html
>
> 73! de Werner
> OE9FWV
>
>
> --  
> For Sale: Parachute. Only used once, never opened. Small stain.
>
>
>
> PGP-Key: <http://www.qsl.net/oe9fwv/furlan.asc>
> Fone [phone]
> Fax [phone]
> Mobile      [phone]
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>
>  

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[oe9fwv]

hi Don,

Don Wilhelm schrieb am 28 Nov 2007 um 9:17:

> Switch the antenna on and off to tell
> how much atmospheric noise is present - if the receiver noise level
> increases when the antenna is connected, then the atmospheric noise is
> higher than the receiver noise floor and more preamp gain will not be of
> benefit for hearing signals.

thank you for the very clear explanation. In the moment (and I think it is
usually like this) the only band where the noise floor with the antenna is not
higher than without antenna is 10m. Without knowing much or thinking about
it I did the same as you, I only used the preamp when the band is very quiet.


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