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Spurious TX harmonics at FT8 on JTDX...
Gerry
Member ✭✭
What cause these spurious TX harmonics on FT8 and its possible solutions?
I monitor FT8 frequently on 20m and the Flex looks great with spots overlayed on the pan adapter... I installed SliceMaster to handle all the settings for JTDX to function. Works very well!
The problem arises when I try to reply to a CQ... The Flex panadapter now looks like this and WHOA!
Where are these harmonics coming from?
I manage to complete the QSO, though. But TX with these birdies, I felt, was not good. How to eliminate these? It happens each time I TX, when I reply to a CQ or when I CQ myself.
It may be interesting to note that, when I TUNE using the Flex TX radio controls, I get this beautiful, crisp signal (we kinda expect this)... centered on the FT8 20m frequency.
BUT when I TUNE from the JTDX program (right-hand side of program screen with other Tabs - Monitor, Bypass, etc) I get this -
All the harmonics appear! JTDX must be the culprit...
I have not found any JTDX setting to fix. I have made sure the Working Frequencies enumerated in the Files >> Settings>>Frequencies contain ONLY the FT8 frequency (deleting/taking away other frequencies added for F/H mode in the band). At TX the harmonics appear.
I suppose this is the same for the other FT8 bands on JTDX...
Any suggestions?
73s
Gerry
DU7EYG
I monitor FT8 frequently on 20m and the Flex looks great with spots overlayed on the pan adapter... I installed SliceMaster to handle all the settings for JTDX to function. Works very well!
The problem arises when I try to reply to a CQ... The Flex panadapter now looks like this and WHOA!
Where are these harmonics coming from?
I manage to complete the QSO, though. But TX with these birdies, I felt, was not good. How to eliminate these? It happens each time I TX, when I reply to a CQ or when I CQ myself.
It may be interesting to note that, when I TUNE using the Flex TX radio controls, I get this beautiful, crisp signal (we kinda expect this)... centered on the FT8 20m frequency.
BUT when I TUNE from the JTDX program (right-hand side of program screen with other Tabs - Monitor, Bypass, etc) I get this -
All the harmonics appear! JTDX must be the culprit...
I have not found any JTDX setting to fix. I have made sure the Working Frequencies enumerated in the Files >> Settings>>Frequencies contain ONLY the FT8 frequency (deleting/taking away other frequencies added for F/H mode in the band). At TX the harmonics appear.
I suppose this is the same for the other FT8 bands on JTDX...
Any suggestions?
73s
Gerry
DU7EYG
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Answers
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YES! I love it when a plan comes together! My Flex is about as old as yours. I don't know how I lived all these years without a panadpter...
Len
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J'ai mon DAX a -10 db et pourtant j'ai des harmoniques à l'émission .
Test fait en mode FDX sur deuxième VFO0 -
I find with WSJT-X I leave the power slider in WSJT-X up all the way and set DAX TX to 48. This keeps the peak indicator just below zero (yellow).
Dave wo2x
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Désolé je ne parle pas français. J'utilise Google Traduction. J'ai mon DAX TX réglé au niveau 48. Puissance WSJT-X au maximum. Quelle est la hauteur des éperons par rapport au signal de transmission réel ?
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