# Error: timed out waiting for TX and/or RX LO to lock **URL:** \ **Category:** GNU Radio\ **Created:** [July 4, 2012, 12:28am UTC](https://www.ruby-forum.com/t/error-timed-out-waiting-for-tx-and-or-rx-lo-to-lock/221184 "2012-07-04T00:28:32Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\ **Post date:** [July 4, 2012, 12:28am UTC](https://www.ruby-forum.com/t/error-timed-out-waiting-for-tx-and-or-rx-lo-to-lock/221184/1 "2012-07-04T00:28:32Z")
Hi, all help error uhd\_cal\_tx\_iq\_balance --verbose root@usrp2:/usr/local/bin# uhd\_cal\_tx\_iq\_balance --verbose linux; GNU C++ version 4.5.2; Boost\_104200; UHD\_003.004.002-177-unstable Creating the usrp device with: … – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes Error: timed out waiting for TX and/or RX LO to lock ---
**Author:** ![aarosoft](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c37758/32.png) [@aarosoft](https://www.ruby-forum.com/u/aarosoft)\ **Post date:** [July 4, 2012, 12:39am UTC](https://www.ruby-forum.com/t/error-timed-out-waiting-for-tx-and-or-rx-lo-to-lock/221184/2 "2012-07-04T00:39:03Z")
Julio, 50 ms seems like a lot of time to allow for a lock, but try changing: boost::this\_thread::sleep(boost::posix\_time::milliseconds(50)); to: boost::this\_thread::sleep(boost::posix\_time::milliseconds(500)); In the source file of uhd\_cal\_tx\_balance.cpp. Let us know if that doesn’t fix things. -John ---
**Author:** ![aarosoft](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c37758/32.png) [@aarosoft](https://www.ruby-forum.com/u/aarosoft)\ **Post date:** [September 24, 2012, 12:31am UTC](https://www.ruby-forum.com/t/error-timed-out-waiting-for-tx-and-or-rx-lo-to-lock/221184/3 "2012-09-24T00:31:23Z")
I had a similar problem a while back. Re-seating the daughter are was the fix.