6400 Side transmissions, Is this Normal?

Dan Trainor

Hello Bill, Thanks for information about IMD illusion in the pan adapter. I understand. I get that. But it is not the symptom I am investigating. What I am looking at is not the same. Hard to explain in words. I tried to show a picture of these spurs that are FAR removed in freq from passband. dan

Bill -VA3WTB

Sorry Dan, as far as the spurs go this goes a little deeper than my understanding. I do beleive it may be something only seen in tune mode. Maybe someone can chime in and explain better.

Dan Trainor

No problem Bill.  Thanks for all your replies and tests.  I appreatiate it.  I think I will just open a ticket with Flex.  Don't want to bother the community - as in the end I suspect it is not an issue / failure with radio.  It is just I want to understand what these "spurs" are and what they are called technically and what produces them and why etc,  Thanks again!  dan

Bill -VA3WTB

Just found this from Gerald,,but you say the spurs are transmitting?

 Gerald - K5SDR, Employee

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Official Response





Those are receiver aritifacts caused by high rf currents inside the radio getting into the ADC. They are NOT going out on the transmitted signal. The are simply not real Note that isolation decreases with increasing frequency so the artifacts will increase with frequency. 

We could have blanked the panadapter as is done on other radios but we have decided not to do so. We like having the panadapters active while transmitting so that you can watch the bands with a second antenna.

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John Orjias

i did not read all this, maybe you got your question answered, but i went to the same freq. set my pan zoom to be just like yours and pressed tune.  I have 2 spurs in the exact same place as the image you posted. it looks pretty close to identical to yours. So what did they say they were, are the normal?