Hi Matt,
If they matched it would be a coincidence. For example, if the P3 is
set to 45 kHz span, then each frequency point on the P3 display is about
100 Hz wide. If the K3 bandwidth is 2.7 kHz, then on a wideband signal
like band noise or SSB, 27 times (14 dB) as much signal is getting to
the K3's S meter as gets to each frequency point of the P3. So you'd
expect the average signal level on the P3 to be about 14 dB (2 or 3
S-units) lower.
To illustrate this without a P3, try this: Set the K3 to the normal 2.7
kHz bandwidth, tune in an SSB signal and note the S meter reading. Now
change the K3 bandwidth to 100 Hz and note the S meter reading. It will
be much lower.
Alan N1AL
On 4/14/2013 4:37 PM, Matt Zilmer wrote:
Hi Alan,
I would guess that running Peak on the P3 and having the S meter on
the K3 set to PEAK ON should give roughly the same results. Correct?
Or does the same discrepancy you advised below exist? Peak and PEAK
ON similarity is what I'm seeing here on the K3 / P3.
73,
matt W6NIA
On Sun, 14 Apr 2013 16:19:17 -0700, you wrote:
Tom,
There are several reasons why the signal level can be different on the
P3 and K3, as explained in the "How to Set Up and Interpret the P3
Display" section of the P3 Owner's Manual. The main reason is that the
effective bandwidth of the P3 is narrower than the K3, so more of the
signal gets through to the K3 S meter than a single pixel on the P3
display. For that reason, the signal or noise level on the P3 can
appear quite a bit lower than on the K3 S meter.
Alan N1AL
On 4/14/2013 3:46 PM, [email protected] wrote:
Hello All,
Question about the Lvl cal operation of the P3. I have noticed a 2 S
unit diff between the K3 and P3. I used the XG-1 to make sure the K3
was set properly. Using Lvl cal, I noted the default was -5.4 and my P3
was -9.6. To get a K3 S meter reading of S4 to equal S4 on the P3, I
had to increase the Transfer gain to -30.0!
This seems excessive. Would appreciate some guidance on how to resolve
this issue.
73
Tom
CX7TT
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