[srsran-users] Outdoor usage with USRP B210

[Modyngs]

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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