# XCVR2450 Band Pass Filters & Frequencies

**URL:** <https://www.ruby-forum.com/t/xcvr2450-band-pass-filters-frequencies/221124>\
**Category:** GNU Radio\
**Created:** [July 1, 2012, 12:58pm UTC](https://www.ruby-forum.com/t/xcvr2450-band-pass-filters-frequencies/221124 "2012-07-01T12:58:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [July 1, 2012, 12:58pm UTC](https://www.ruby-forum.com/t/xcvr2450-band-pass-filters-frequencies/221124/1 "2012-07-01T12:58:53Z")

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The XCVR 2450 covers frequencies around 2.4 GHz and 2.5 GHz and also 4.9  
to  
5.9 GHz.

When running uhd\_usrp\_probe it said 2400 to 2700MHz!  
(E.g. I assume hardware performance drops off above 2.4 GHz but any  
reason  
why it didn’t cap my frequency at 2400MHz?)

[http://code.ettus.com/redmine/ettus/documents/12](http://code.ettus.com/redmine/ettus/documents/12)  
Also I’m definitely not a hardware designer but I’ve been looking at the  
XCVR2450 datasheet and it seems there is a 2.45 GHz band pass filter for  
the lower frequency receiver pass (but none for the higher one…) and  
also  
for the transmit pass there is a 5.5GHz band pass filter for the higher  
frequency transmit pass but not the lower one, How come this is the  
case?

E.g. If I wanted to reduce my unwanted image frequencies etc around 2.4  
to  
2.5 GHz, could I get another BP filter of the same type and just  
externally  
filter before transmitting to the antenna?

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**Author:** ![teddio](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/b3f665/32.png) [@teddio](https://www.ruby-forum.com/u/teddio)\
**Post date:** [July 11, 2012, 1:35am UTC](https://www.ruby-forum.com/t/xcvr2450-band-pass-filters-frequencies/221124/2 "2012-07-11T01:35:30Z")

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On 07/01/2012 03:58 AM, Michael H. wrote:

> The XCVR 2450 covers frequencies around 2.4 GHz and 2.5 GHz and also 4.9 to  
> 5.9 GHz.
> 
> When running uhd\_usrp\_probe it said 2400 to 2700MHz!  
> (E.g. I assume hardware performance drops off above 2.4 GHz but any reason  
> why it didn’t cap my frequency at 2400MHz?)

I see probe printing 2.4 to 6.0. Maybe you are looking at a different  
board? Can you send the output of uhd\_usrp\_probe.

> [http://code.ettus.com/redmine/ettus/documents/12](http://code.ettus.com/redmine/ettus/documents/12)  
> Also I’m definitely not a hardware designer but I’ve been looking at the  
> XCVR2450 datasheet and it seems there is a 2.45 GHz band pass filter for  
> the lower frequency receiver pass (but none for the higher one..) and also  
> for the transmit pass there is a 5.5GHz band pass filter for the higher  
> frequency transmit pass but not the lower one, How come this is the case?

Probably a design recommendation from maxim, or something we empirically  
determined.

> E.g. If I wanted to reduce my unwanted image frequencies etc around 2.4 to  
> 2.5 GHz, could I get another BP filter of the same type and just externally  
> filter before transmitting to the antenna?

Yes, definitely. Also see:  
[http://files.ettus.com/uhd\_docs/manual/html/dboards.html#xcvr-2450](http://files.ettus.com/uhd_docs/manual/html/dboards.html#xcvr-2450)

-Josh

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<div class="post-metadata">

**Author:** ![teddio](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/b3f665/32.png) [@teddio](https://www.ruby-forum.com/u/teddio)\
**Post date:** [July 19, 2012, 6:05pm UTC](https://www.ruby-forum.com/t/xcvr2450-band-pass-filters-frequencies/221124/3 "2012-07-19T18:05:18Z")

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Hi Josh,

Sorry for the belated reply!  
Yes it says 6GHz on the uhd\_usrp\_probe but i was just surprised given  
that  
the website said its limit was 5.9GHz.

-Michael