[Elecraft] FW4.51 CWT

[Wayne Burdick]

We're looking into this.

tnx
Wayne
N6KR

On May 15, 2012, at 5:07 AM, Mike Harris wrote:

> G'day,
>
> Further to my first post:
>
> Re installed 4.48.  500Hz filter, XG1 on antenna port 1 (OFF), ATT ON,
> THR 8, SLP 6,  AGC-F, RF gain Fully CW.
>
> The CWT indicator bar was visible and flickering on noise(?) always to
> the right of centre mark by 2 scale marks.
>
> Switched on the XG1 1uV, S-meter to S3, CWT locked and tracks -141Hz  
> to
> +133Hz.  The CWT bar reaches both ends of the CWT tuning scale and
> starts to flicker when the signal as measured by K3 dBV shows a drop  
> of
> -2 to -2.6  On tune AFV measures 55.  With XG1 OFF AFV measures 7.
>
> Re installed 4.51.  No other changes.
>
> The CWT indicator bar not showing.
>
> Switched on XG1 1uV,  S-meter to S3, CWT locked and tracks -72Hz to
> +100Hz.  At the LF end the CWT marker only reaches -3 CWT scale marks
> before flickering.  At the HF end the CWT marker reaches +5 scale  
> marks
> which is end of scale before flickering.  Signal level 0.0dBV and
> -1.3dBV respectively.  On tune AFV measures 55.  With XG1 OFF AFV
> measures 7.  Same as with 4.48.
>
> So without a doubt on my K3 #345 there is a significant change in CWT
> behaviour between firmware 4.48 and 4.51.  Whilst I don't doubt Lyle's
> measurement of CWT tracking at -132dBm it nevertheless failed to  
> solidly
> hold a signal I was monitoring on 40m which was 1 S-unit above an S2
> noise level.
>
> Is this significant, does it matter if the CWT bar doesn't display  
> until
> it has a signal to lock onto?  Personally I find it useful that the  
> CWT
> bar shows as in 4.48 (as I believe it always has) because it gives an
> indication that the CWT function is working.
>
> Oddly the latest CWT mode is pretty much the same as the add on spot
> display on my K2 where I adjusted the audio input level to reduce the
> amount of flickering on noise.  Why do I like one and not the  
> other?  No
> idea, funny old world.
>
> Don't shoot the messenger.
>
> Regards,
>
> Mike VP8NO
>
>
>
>
>
>
> On 15/05/2012 01:37, Keith Heimbold wrote:
>> I have run into the same issue with CWT.  I had to turn the noise  
>> blanker off for CWT to pick up the signal.  I am still playing  
>> around with settings and hope to find the proper configuration to  
>> get max sensitivity without turning off the NB. I need NB at my  
>> QTH. It On SSB, I am enjoying 4.51 though I am still trying to  
>> figure out where to put AGC SLP. I like threshold at somewhere  
>> between 16-18.
>>
>> Thanks Elecraft for being so awesome!
>>
>> Keith
>> AG6AZ
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