On 26/01/2023 16:33, Mark-Jan Bastian wrote:
Hi,
On page 7 of the UBX-160 schematics
https://files.ettus.com/schematics/ubx/UBX-160_revE.pdf
there is a LO filter selection with three paths:
- 800 MHz-2.2 GHz
- passthrough (no filter)
- lowpass 400 MHz..800 MHz
Next to that, there is also a way to measure the LO on J3.
Question:
- Is this LO filter automatically selected, and where should I look for the
rules ?
- Is there some way to control this LO filter selection via UHD, similar to a
tune request?
- The IQ mixer ADL5371 documentation warns that the LO's 3rd harmonic
needs to be well suppressed. Is there benefit to be gained
by using an external, more filtered LO instead of the on-board UBX-160 LO plus
its filters ?
Mark-Jan
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Is this a "just curious" type of question, or are you seeing issues that
you believe may be due to the UBX
LO and Mixer architecture?
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