Posted by
NK7Z on
Jan 13, 2019; 10:38pm
URL: http://elecraft.85.s1.nabble.com/K3-Receiver-recovery-time-tp7648024p7648056.html
Thank you Don!! I was trying to get a general feel for what to expect,
a ms, or us type of answer...
I was thinking of using the IF to avoid the DSP filters for just the
reasons you cited. I am sure you are correct about testing-- time to
break out the scope...
Thanks again for your insight!
73s and thanks,
Dave (NK7Z)
https://www.nk7z.netAward Manager, 30MDG Grid Contest
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon
On 1/13/19 1:08 PM, Don Wilhelm wrote:
> 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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