# File received problem

**URL:** <https://www.ruby-forum.com/t/file-received-problem/243413>\
**Category:** GNU Radio\
**Created:** [October 19, 2015, 2:31pm UTC](https://www.ruby-forum.com/t/file-received-problem/243413 "2015-10-19T14:31:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\
**Post date:** [October 19, 2015, 2:31pm UTC](https://www.ruby-forum.com/t/file-received-problem/243413/1 "2015-10-19T14:31:15Z")

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Hi,

I am currently working on transmiting and receiving txt files and images  
using 2 USRPN200s.

The flowgraphs are as follow:

TX: File source --\> Packet encoder --\> GMSK Mod --\> multiply const–\>  
UHD sink.

RX: UHD source --\> multiply const --\> Low Pass Filter --\> GMSK Demod --\>  
Packet decoder --\> File sink.

In this way, I get receive the file, but many of data is lost :S

For example: I transmit a jpg file of 203.3kB and I receive a jpg file  
of 92.2kB

So, how can I fix this? And why it happens if USRPs are so  
close…(perhaps it’s about the synchronization…I noticed that the  
data I lose is always the last bits of the file)

I really appreciate any help