# OFDM Tranceiver

**URL:** <https://www.ruby-forum.com/t/ofdm-tranceiver/241485>\
**Category:** GNU Radio\
**Created:** [April 9, 2015, 4:46pm UTC](https://www.ruby-forum.com/t/ofdm-tranceiver/241485 "2015-04-09T16:46:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [April 9, 2015, 4:46pm UTC](https://www.ruby-forum.com/t/ofdm-tranceiver/241485/1 "2015-04-09T16:46:19Z")

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Hi,  
I am trying to make an OFDM transceiver using my USRP1.  
I used the existing examples of GRC. (tx\_ofdm.grc and rx\_ofdm.grc)

I am having problem in the communication while i transmit in HF band  
using LFTX and LFRX daughterboards.

The model is working fine when i transmit at 700 MHz using flex900  
daughterboard.

Thanking in advance.

Regards,  
Usman Khalil