[Elecraft] [KX3] How to use manual notch in SSB mode

[David Anderson]

Thanks for that workaround Steve, I must give it a try here. 

I can't understand why Elecraft don't give us the option of manual notch on SSB on the KX3, as I find the auto notch doesn't always lock onto weak but annoying heterodynes but could be easily notched out manually.  

73 from David GM4JJJ

> On 4 Mar 2016, at 05:33, WD4SDC <sdsmithbiz at gmail.com> wrote:
> 
> Greetings.
> 
> You *can* use manual notch on SSB on the KX3.
> 
> Turns out that if you turn on the manual notch while in CW mode that it will
> stay on if you switch to SSB without cycling thru a mode that cancels it -
> such as FM or data modes.  
> 
> Here's an example of how I did it.
> Starting with LSB mode:
> 
> A->B 
> MODE -> CW
> FC -> +0.92
> BW=2.8KHz
> RIT=-700Hz    This removes (my) pitch offset and opens the bandwidth to receive
> LSB voice.
> 
> Now you can turn on the notch filter and adjust to remove CW RFI.
> Press A/B and turn off RIT to have SSB with manual notch enabled - and CW
> removed!  A/B allows me to go from CW to SSB w/o cycling thru FM, although I
> could also disable FM mode.
> 
> For USB, you would need to use CWR and RIT=+700Hz.
> 
> Why this is desirable:
> The auto-notch feature is great for intermittent tuneups or other (multiple)
> CW signals in the SSB passband, but it is applied after the AGC, so if the
> CW signal is much stronger than the voice signal, the voice signal is
> suppressed even though the tone is removed - like when trying to copy an S3
> voice with a S9+20 CW sitting on it.
> 
> For strong "persistent" CW QRM, using the manual notch removes the CW signal
> *before* the AGC, allowing AGC to operate on the desired signal.  This notch
> is at least 80dB!  The S9+20dB CW goes away, and S3 is perfectly readable!
> Very cool! Especially useful if the CW signal is in the 500-1500Hz range -
> making it difficult to remove with low or high pass BW adjustment and still
> copy voice - you can, but it takes effort.
> 
> I tried creating a macro for this - it kinda works.
> 
> MD3;SWH20;MD1;
> 
> Works, but the macro name covers up the notch frequency display in the VFOB
> area.  You *can* adjust the notch frequency even though you already in SSB
> mode (if you turn the knob within the 2 sec window), but it's a blind
> adjustment.  And then the macro name sticks until you do something to update
> the VFOB display (like adjust BW). If you just send the commands using the
> KX3 utility program, it works great, but you need a pc :\.  Perhaps there is
> a macro work-around?
> 
> 73
> Steve
> WD4SDC
> 
> 
> 
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/KX3-How-to-use-manual-notch-in-SSB-mode-tp7614894.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> 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
> Message delivered to gm4jjj at yahoo.co.uk