# The RF LO does not support the requested frequency

**URL:** <https://www.ruby-forum.com/t/the-rf-lo-does-not-support-the-requested-frequency/242807>\
**Category:** GNU Radio\
**Created:** [July 30, 2015, 5:06am UTC](https://www.ruby-forum.com/t/the-rf-lo-does-not-support-the-requested-frequency/242807 "2015-07-30T05:06:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [July 30, 2015, 5:06am UTC](https://www.ruby-forum.com/t/the-rf-lo-does-not-support-the-requested-frequency/242807/1 "2015-07-30T05:06:52Z")

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hi. i am using ubuntu 14.04 and i am trying run wifi\_rx.grc.when i try  
run this wifi\_rx.grc it comes out with this:

Generating:  
“/home/userr/Downloads/gr-ieee802-11-master/examples/wifi\_rx.py”

Executing:  
“/home/userr/Downloads/gr-ieee802-11-master/examples/wifi\_rx.py”

linux; GNU C++ version 4.8.2; Boost\_105500;  
UHD\_003.008.002-135-ga393ec83

Using Volk machine: avx\_64\_mmx  
– Opening a USRP2/N-Series device…  
– Current recv frame size: 1472 bytes  
– Current send frame size: 1472 bytes

## UHD Warning: The hardware does not support the requested RX sample rate: Target sample rate: 5000.000000 MSps Actual sample rate: 50.000000 MSps – Tune Request: 2412.000000 MHz – The RF LO does not support the requested frequency: – Requested LO Frequency: 2412.000000 MHz – RF LO Result: 2411.999389 MHz – Attempted to use the DSP to reach the requested frequency: – Desired DSP Frequency: -0.000611 MHz – DSP Result: -0.000611 MHz – Successfully tuned to 2412.000000 MHz

UHD Warning:  
The total sum of rates (50.000000 MSps on 1 channels) exceeds the  
maximum capacity of the connection.  
This can cause overflows (O).  
O

> > > Done

what should i do. i hope you can help me.

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<div class="post-metadata">

**Author:** ![fie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/f9ae1b/32.png) [@fie](https://www.ruby-forum.com/u/fie)\
**Post date:** [July 31, 2015, 8:41pm UTC](https://www.ruby-forum.com/t/the-rf-lo-does-not-support-the-requested-frequency/242807/2 "2015-07-31T20:41:58Z")

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On Thu, Jul 30, 2015 at 4:26 AM, Daniele N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> 

The TI LM97600 supports sampling at 5 GSPS.

[http://www.ti.com/product/lm97600](http://www.ti.com/product/lm97600)

and it’s available at Digikey for only $325 in singles. 292 pin BGA  
package, so not something you’ll deadbug onto a board.