[Elecraft] KX3 firmware update (12-kHz audio spur fixed, etc.)

[Wayne Burdick]

I just confirmed that the opposite-sideband image is way down. I believe John was hearing the effect of the notch at 1500 Hz, which is a characteristic of Weaver demodulation. When you inject a carrier and sweep through the SSB passband, the existence of the notch can make it appear that you're hearing both desired and image signals -- but what you're really hearing is just the tone at different pitches on either side of the notch.

73,
Wayne
N6KR


> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wayne Burdick
> Sent: Sunday, August 18, 2013 6:19 PM
> To: John_N1JM
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KX3 firmware update (12-kHz audio spur fixed, etc.)
> 
> Interesting. Well, I and a number of other testers have noted better
> fidelity, and the op who had measured the in-band OSB image at 20 dB
> reported that it had dropped significantly.
> 
> I've been listening to music in the AM broadcast band in SSB mode with FL2
> engaged, and it sounds quite clean.
> 
> 73,
> Wayne
> N6KR
> 
> 
> On Aug 18, 2013, at 4:03 PM, John_N1JM <johnn1jm at gmail.com> wrote:
> 
>> No improvement here that I can detect in the weaver demod fix.
>> 73,John N1JM
>>