Re: [Discuss-gnuradio] Transmit volume very low

[Ralph A. Schmid, dk5ras]

First of all, you are transmitting with 5 KHz of deviation, but when I look at your TX frequency, you are listening with a normal FM radio to it. This expects 75 KHz of deviation! Also your WBFM receive block expects more than 5 KHz.

 

Isn't there also a WBFM transmitting block? If available, this should be able to do what you want, I mean to remember the NBFM block is somehow limited in its maximum deviation.

 

What does the resampler do? It gives your audio a pitch, is this intended?

 

The multiply const block should also work, when being used at the place where now the resampler is.

 

Ralph.

 

 

From: address@hidden [mailto:address@hidden On Behalf Of Santos Campos
Sent: Monday, March 28, 2016 7:56 PM
To: address@hidden
Subject: [Discuss-gnuradio] Transmit volume very low

 

Hello, all! Newer user here and even newer to the mailing list!

 

I'm trying to transmit a short .wav file via a b200 board (usrp). Before I broadcast I was trying to hear what the audio would sound like after going through the block diagram and I ended up with the diagram attached. It "works" but the volume is very very low. Any ideas? Previously I'd just put a multiply const block right before the audio sink, but I want the sample to be already transmitting with a higher magnitude. Any help is much appreciated!​