[srsran-users] Outdoor usage with USRP B210

[Ralph A. Schmid, dk5ras]

Normal behavior, your downlink kills your uplink :) You will need a duplexer for the used bandsplit to combine up and down into one antenna, or steep filters for RX and TX path when using separated antennas for up and down. 

 

Ralph.

 

 

From: srsran-users [mailto:srsran-users-bounces at lists.srsran.com] On Behalf Of Antonio Albanese
Sent: Thursday, November 4, 2021 3:46 PM
To: srsran-users at lists.srsran.com
Subject: [srsran-users] Outdoor usage with USRP B210

 

Hi guys,

I'm trying to set up srsLTE for outdoor usage in a small area with a USRP B210 as RF frontend. To this aim, I'm using two amplifiers: MiniCircuits ZX60-V63+ in TX and ZX60-33LNR-S+ in RX. I'm wondering why I notice some deterioration of the uplink SNR when I use both amplifiers, while the SNR is pretty high when I use only the RX amplifier. 

 

The only thing I can think of is that I'm not using any RF filter but I can't confirm it as I don't have any filter. Besides, I'm not sure if a filter would be sharp enough to block the interference from the TX amplifier.


Do you have any HW suggestions that would offer good outdoor performances?

Thank you!
Antonio

ᐧ

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20211105/ba58b353/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ~WRD000.jpg
Type: image/jpeg
Size: 823 bytes
Desc: not available
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20211105/ba58b353/attachment.jpg>