[srsran-users] Outdoor usage with USRP B210

[Antonio Albanese]

Thanks a lot, guys. I checked some filter options but sharp ones are too
expensive for my application. I think I'll buy a cheaper LTE Band 3
duplexer.
I'm also looking into how to mitigate out of band emissions.

Best regards,
Antonio

ᐧ

On Tue, 9 Nov 2021 at 12:57, Modyngs <mobilebackup95 at gmail.com> wrote:

> Hi Ralph,
> Could you please guide us in some models and brand. For duplexer or step
> filter and amplifiers for band 7?
>
> Thanks
> Best regards
>
> On Fri, 5 Nov 2021, 11:56 Ralph A. Schmid, dk5ras, <ralph at schmid.xxx>
> wrote:
>
>> 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
>>
>> [image: Das Bild wurde vom Absender entfernt.]ᐧ
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>>
>
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