[Elecraft] MCU 4.51 NB

[David Cutter]

Would it help the tests to engage the pre-amp? ie make things more 
challenging.

David
G3UNA

On 12/05/2012 17:22, Joe Subich, W4TV wrote:
>
> On 5/12/2012 12:17 PM, Ted Bryant wrote:
>   >  Was v4.51 sent to the 4.50 testers?
>
> Apparently not all (I had to request it).
>
> I've been doing some crude testing ... with 4.51 AGC THR = 15 is
> approximately -73 dBm/S9 (to the best of my ability to measure with
> the XG3 and step attenuator).
>
> With high values for AGC THR it is important to use higher values of
> AGC SLP otherwise a sudden very strong signal will drive the audio
> amp and/or headphone amp into severe distortion - particularly if the
> AF Gain is high.
>
> I'm finding AGC THR in the 12/13 range and SLP in the 8/10 range is
> very comfortable and seems to "open up" the K3 receiver.  The only
> problem is that my poor antennas don't given me enough strong signals
> to really evaluate strong signal pile-up with off air signals at the
> higher thresholds.
>
> 73,
>
>      ... Joe, W4TV
>
>
> On 5/12/2012 12:17 PM, Ted Bryant wrote:
>> Was v4.51 sent to the 4.50 testers?  If so, I missed it.
>>
>> The major difference I've noticed with 4.50 is that cw signals, especially
>> the low level ones, now seem much "cleaner".
>>
>> 73, Ted W4NZ
>>
>>
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net
>> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of W0MU Mike Fatchett
>> Sent: Saturday, May 12, 2012 11:22 AM
>> To: elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] MCU 4.51 NB
>>
>>
>> I did not mean to imply that the NB had changed from 4.50 to 4.51.  My
>> comment was from 4.48 to 4.5X.
>>
>> I can see how you read it differently though.
>>
>> I have not noticed a change in the NB from .50 to .51
>>
>> Mike W0MU
>>
>> W0MU-1 CC Cluster w0mu.net
>>
>>
>> On 5/12/2012 6:30 AM, Toby Pennington wrote:
>>> Mike,  you could be correct.  This morning I seem to have a little
>> distortion in the NB  which I did not notice before.  It's not bad,  but a
>> little is there.
>>> I may go back to 4.50 just to check it out.
>>>
>>> Toby  W4CAk
>>>
>>>
>>>
>>> I just got it tonight.  I have not had much chance to compare but the NB
>>> in 4.50 is much better!  A curious unexpected side effect!
>>>
>>> Mike W0MU
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