Alan,
Thank you for this, I have been wondering whether my P3 required
calibration. I am not sure if this is mentioned in the manual but if not
it should be. The P3 is a new product and some of us are still learning.
The forum once again proves valuable.
73 Doug EI2CN
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Alan Bloom
Sent: 06 May 2011 23:00
To: Jim Miller KG0KP
Cc: Elecraft Reflector
Subject: Re: [Elecraft] K3 S meter vs P3 S scale
The reason the P3 reads lower than the K3 on noise or SSB signals is
that each display point on the P3 screen covers only a small bandwidth.
As explained in the manual, each display point is about 1/450 of the
span. For example, if the span is 45 kHz, then each display point only
covers about 100 Hz.
You'd see the same effect on the K3 if you narrowed the bandwidth from
2700 Hz to 100 Hz. The S meter would read 10 * log (2700/100) = 14 dB
(2-3 S units) lower.
Alan N1AL
On Thu, 2011-05-05 at 21:59 -0600, Jim Miller KG0KP wrote:
> Seems to be quite a difference in the readings between the P3 showing S
> scale and he S meter reading on the K3. The software in both is up to
> date(recently at least). The difference is quite significant with the P3
> being considerably lower. Maybe I don't know how to read the two meters.
> On the K3 I read the mostly steady peak reading excluding the static
crashes
> if any. On the P3 using clear frequency noise as an example, I tend to
read
> the "average" of the noise trace. Should I be reading the peaks
> (disregarding static crashes)?
>
> Is there a calibration I need to do? To which and where is the procedure
> spelled out?
>
> Will I will need to order the new XG3? (please)
>
> TIA, de Jim KG0KP
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
