UmTRX preselector frontend updae

Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.com
Fri Aug 24 08:34:27 UTC 2012


Hi Alexander,

As far as I understand, the IF frequency should be 360 MHz as the UmSEL
uses the TB0130A IF SAW filter. Its center frequency is 360 MHz.

By the way, why do you say it would be a problem if IF was above 380 MHz ?
Because of interferences ? In this case, would it still be problem if we
install the UmTRX + UmSEL boards inside an enclosure ?

Best regards.

Jean-Samuel.
:-)


On Fri, Aug 24, 2012 at 5:31 AM, Alexander Chemeris <
alexander.chemeris at gmail.com> wrote:

> Andrey,
>
> Could you remind me what the IF after the preselector?
>
> A comment from Harald from IRC: I hope the IF is not above 380 MHz,
> because 380...400 MHz is the European emergency services band (strong
> tetra BTS, ...)
>
> On Thu, Aug 23, 2012 at 11:28 PM, Alexander Chemeris
> <alexander.chemeris at gmail.com> wrote:
> > Hi all,
> >
> > Here is an update about a preselector frontend board on which
> > we're working right now. Attached is an updated schematics of the
> > board and 3D view of the board itself and the proposed way of mounting
> > it to the main board.
> >
> > The github repository still contain an older revision of the
> > schematics - I will update it a bit later when I get full project
> > files from Andrey Sviyazov.
> > https://github.com/chemeris/umtrx-schematics/tree/master/umtrx-v2-rxsel
> >
> > We would appreciate all constructive comments about the board design -
> > from both RF and mechanical points of view.
> >
> > --
> > Regards,
> > Alexander Chemeris.
> > CEO, Fairwaves LLC / ООО УмРадио
> > http://fairwaves.ru
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ООО УмРадио
> http://fairwaves.ru
>
>
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