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What is This? Digital Modes on KX3
21 July 2014 | by I have been having a blast lately with digital modes like PSK-31 and JT-65/JT-9. My little KX3 is doing a great job even without having run the temperature compensation. Of course I am keeping my power to 2 or 3 watts – which helps a lot.
I have noticed a strange thing for a while, but I am just now getting around to asking about it.
When I look at the waterfall there is an area that is basically blanked out – for lack of a better term.
Here is a screen shot of the waterfall in WSJTX (JT-65). You will notice the black area on the left.
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| Waterfall of WSJTX – What is “black” on left edge? |
As you can see there is an area on the left that is in the frequency range, but it is “blacked out”. I wonder how many signals are in this area?
Those if you with a KX3 or those of you that might know what this is – please let me know! If you know how to fix this, please let me know that as well!
I am looking forward to hearing the responses – I appreciate the help!
4 Responses to “What is This? Digital Modes on KX3”
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The black area is where you bandpass filter does it cut off. The KX3 has a very good filter system as you can see. Just for yucks make you bandpass narrower. You black are will get bigger. I am glad you are have such good success with these modes. Have fun…
73 Harry K7ZOV
KX3 Serial #0064
It looks like you have 3.1 KHz of bandwidth showing there, did you try adjusting the PBT bandwidth? The stuff all the way to the left (near 0 hz) is likely noise on your audio interface.
Jeff n1kdo
Thanks guys! The PBT is opened all the way up since I am using Data A mode on the KX3. Forgive my ignorance, but could there be signals in that bandwidth that I am not seeing? Should I shift the scale over to move that further left?
Yes there could be and probably are signals there. To check them out, move your center frequency (receive frequency) lower or higher to put the passband over them.