# FM receiver doesn't work

**URL:** <https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795>\
**Category:** GNU Radio\
**Created:** [October 6, 2009, 10:15am UTC](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795 "2009-10-06T10:15:31Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Fatih\_Arslan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ec9cab/32.png) [@Fatih\_Arslan](https://www.ruby-forum.com/u/Fatih_Arslan)\
**Post date:** [October 6, 2009, 10:15am UTC](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795/1 "2009-10-06T10:15:31Z")

</div>

Hi,

We bought a new USRP motherboard with several daugtherboards. I’  
totally a newbie. Our current Daugtherboards are:

LFRX - LF  
LFTX - LF  
DBSRX -LF  
TVRX

Now, if we try to run the script ./usrp\_wfm\_rcv.py we get the error:

Using RX d’board A: LF Rx  
This daughterboard does not cover the required frequency range  
for this application. Please use a BasicRX or TVRX daughterboard.

I guess our daughterboards do not support the necessary frequency  
bandwith.

Am I right ? What can I do to receive FM signals ?

Thanks in advance

–  
Fatih ARSLAN  
[blog.arsln.org](http://blog.arsln.org)

---

<div class="post-metadata">

**Author:** ![Fatih\_Arslan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ec9cab/32.png) [@Fatih\_Arslan](https://www.ruby-forum.com/u/Fatih_Arslan)\
**Post date:** [October 6, 2009, 12:06pm UTC](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795/2 "2009-10-06T12:06:12Z")

</div>

Fatih

The fm receiver demo will work when you use a TVRX daughterboard. You  
can use a BasicRX daughterboard, but then you would have to use an  
analogue filter to prevent aliasing and you would also need to read up  
on bandpass sampling to figure out where your frequency of interest  
would end up after being sampled at 64Msps.

Sebastiaan

---

<div class="post-metadata">

**Author:** ![Fatih\_Arslan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ec9cab/32.png) [@Fatih\_Arslan](https://www.ruby-forum.com/u/Fatih_Arslan)\
**Post date:** [February 20, 2014, 6:36am UTC](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795/3 "2014-02-20T06:36:55Z")

</div>

On 02/19/2014 12:08 PM, svanwoezik . wrote:

> I’m running 3.7… just updated my mac ports last night. Yes I see  
> signal when I tap output of usrp. QT and Wx both accomplish this.

Please answer to the list.

Alright, are you seeing zeros or nada after the FM receiver? See also  
Nathan’s msg.

M

---

<div class="post-metadata">

**Author:** ![Fatih\_Arslan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ec9cab/32.png) [@Fatih\_Arslan](https://www.ruby-forum.com/u/Fatih_Arslan)\
**Post date:** [February 20, 2014, 9:04am UTC](https://www.ruby-forum.com/t/fm-receiver-doesnt-work/176795/4 "2014-02-20T09:04:36Z")

</div>

I get a steady stream of zero’s on my terminal I believe - if that’s  
what  
your asking Martin. I’m not at my radio now. Thanks BTW.