[Elecraft] MCU 4.51 NB

[Joe Subich, W4TV]

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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>