I agree. The code that was sent includes an explicit call to set_tx_lo_source. 
But it needs to also appear in the device arguments. 

Sent from my iPhone

> On Dec 8, 2021, at 12:14 PM, Rob Kossler <rkoss...@nd.edu> wrote:
> 
> 
> I searched the code for "rx_lo_source=external" and "tx_lo_source=external", 
> but didn't find anything related. It seems that the device args should 
> include these.  
> 
>> On Wed, Dec 8, 2021 at 11:02 AM Marcus D. Leech <patchvonbr...@gmail.com> 
>> wrote:
>> On 2021-12-08 02:05, zeyuan...@zengyi-tech.com wrote:
>>> I do not set TX or RX.This is my python code.Please give me some 
>>> suggestions.
>>> 
>>> Thinks.
>>> 
>>>  
>>> 
>>>  
>>> 
>>> 
>> Ah, you're using Gnu Radio.  I'll have to think about how to meet the 
>> constraints of external-LO use when using Gnu Radio.
>> 
>> Has anyone else done this?
>> 
>> 
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