[Elecraft] [P3] How to measure bandwidth of RX signal

[Alan Bloom]

 > I believe that the P3 is tapped prior to any BW restrictions,

Correct.  I think the best way to measure an SSB signal's bandwidth on 
the P3 is to turn on peak hold.  After a few seconds the spectrum 
display will show a pretty accurate picture of the spectral shape of the 
signal

Alan N1AL



On 04/28/2014 07:08 AM, David Cole wrote:
> Hi,
>
> All the ESSB talk got me wondering about how accurate the P3 might be
> for measuring bandwidth.  Could someone review my method for this
> outlined below and comment please:
>
> 1.  Use ATT if needed to avoid very strong signals
> 2.  Set bandwidth to 4 KHz.  See note below.
> 3.  Adjust Span on P3 5 KHz per side
> 4.  Shaded area above waterfall indicates K3 bandwidth
>
> Watch P3.  Can one trust the waterfall display to show actual bandwidth?
> If so, how accurate would it be?
>
> Note:
> I believe that the P3 is tapped prior to any BW restrictions, (of merit
> to this exercise), so I understand that step 2 is just for my ears only,
> and does not affect BW display on the P3.  Is that a correct assumption?
>