Phase gap in signal (N200)

[Albom]

Hi!

I have a problem in generating radio pulses with USRP N200 (LFTX Daughterboard 0-30 MHz). There is a phase gap at 11us. It doesn't depend on TX frequency, pulse length, and duty cycle.

Source code is in file attached. I compile and run it on Linux Mint 20 (x86_64). Additional info: GNU C++ version 9.2.1 20200304; Boost_107100; UHD_3.15.0.0-2build5.

How can I solve this problem?

[Albom]

Fixed.

I found the solution. The problem is low tx_rate. The first element (before the phase gap) should be at the end of the pulse! But I was not able to move it to the end. It is only possible to make the first element more narrow by increasing tx_rate. But it causes a lot of "S" errors. I updated UHD library to version 4. It didn't help. Then I downgraded the library to 003.007.003 (boost was also downgraded to 1_55_0). And programs work perfectly now.