Re: [Openbts-discuss] Economic SDR to test OpenBTS

[Andrew B. <an...@ca...>]

On 27 Nov 2015 12:07 am, "Erich Dachleger" <eda...@ya...> wrote:
>
> Why is filter rework recommended  for calypso-bts? For improved recepcion?

Tx and Rx frequencies are swapped from what they would be with an MS.

> I did not perform filter rework when I tested the setup and it still was
possible to register to the bts within about 10 meters distance.
>
> regards
>
> erich
>
>
>
> Den Torsdag, 26. november 2015 13.06 skrev Andrew Back <
an...@ca...>:
>
>
> On 25 November 2015 at 21:53, Gloria Mazzi
> <maz...@gm...> wrote:
> > Check Calypso BTS PoC from osmocom's family. ;)
> >
> > Couple of 10€ phones and voilá your BTS ;)
>
> Yes, albeit with somewhat limited practical utility:
>
> "Since you have only one slot, you will only be able to transmit
> broadcast, do location updating and send/receive SMS."
>
>
http://openbsc.osmocom.org/trac/wiki/SDR_OsmoTRX_network_from_scratch#calypso-BTS
>
> Those handsets are also getting harder to come by and then there is
> the matter of some SMD filter rework required:
>
>   http://246tnt.com/gsm/rx_filter.html
>
> Regards,
>
> Andrew
>
> --
> Andrew Back
> http://carrierdetect.com
>
>
>
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