Re: K3: Receiver recovery time

Posted by Don Wilhelm on Jan 13, 2019; 9:08pm
URL: http://elecraft.85.s1.nabble.com/K3-Receiver-recovery-time-tp7648024p7648049.html

Dave,

I would be cautious about looking only at the IF.  That is all in front
of the DSP.
Certainly the DSP creates some latency, but that is not what we are
talking about.  The DSP latency will delay all signals.

So test in the configuration that you will likely use.  If using the IF
output, then test only at the IF.

Your question relates to the recovery time for the entire receiver.
And that does include the filters, both roofing filters and the DSP
filtering.

Don't forget that the Hardware AGC cannot be turned off, but that does
not come into play until the signal is greater than S-9+60

As A result, I believe you need to do actual testing with your
particular K3 under various filtering conditions.
In other words, you are asking a very complex question, and you have not
given us the other configuration settings and filters to be used - other
than AGC OFF.  For that reason, your K3 may have a different answer than
others.

73,
Don W3FPR

On 1/13/2019 3:43 PM, Dave Cole (NK7Z) wrote:

> Hi Don,
>
> Thanks for the combined brain power!  I have a plan for testing if it
> ever gets that far.  I am just trying to see if the K3 receiver recovers
> sufficiently fast in a general sort of way first.
>
> I believe I could look at RF levels on the IF while transmitting, (using
> a different transmitter and a storage scope to look at the K3 IF), then
> just drop the carrier while still looking at the levels with that scope.
>   When I see signals return to the IF I have the recovery time of the
> receiver.
>
> I am just trying to skip that step hoping someone actually knows the
> recovery time of the receiver, as opposed to actual testing.
>
> If the K3 is even close, I will set up test jig for it, if not, then
> I'll look for a better way.
>

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