# Tx-gain in gr-digital/ofdm/example/benchmark\_tx.py

**URL:** <https://www.ruby-forum.com/t/tx-gain-in-gr-digital-ofdm-example-benchmark-tx-py/232722>\
**Category:** GNU Radio\
**Created:** [October 23, 2014, 6:20pm UTC](https://www.ruby-forum.com/t/tx-gain-in-gr-digital-ofdm-example-benchmark-tx-py/232722 "2014-10-23T18:20:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [October 23, 2014, 6:20pm UTC](https://www.ruby-forum.com/t/tx-gain-in-gr-digital-ofdm-example-benchmark-tx-py/232722/1 "2014-10-23T18:20:30Z")

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Hi

Does anyone here know what is the transmission power for USRP N210? I  
searched the datasheet, it seems the maximum is about 20 dbm. But when I  
run the code in gr-digital/ofdm/example/benchmark\_tx.py, the tx-gain  
range is from 0 db to 31.5 db.  
I think it apparently could not be as high as 31.5 db, which is 1000w.  
So anyone here know how to figure out the transmission power here? for  
example , when I choose --tx-gain to be 30 db.

Thank you!