Here PCB file of project.
Hi all.First release of UmTRXv1b seems finished.šAll suggestions and issues are welcomed, especially prior to production (few days).šThere are 4 Rx inputs to implement either scan function or software diversity receiving.There are 16pin connector to supply and control external preselector, amplifier, LNA, ATT, diversity switch...This new release have 2U size (100x160mm) that more universal for indoor housing to put together several UmTRX's with PC and power supply modules in one rack.šAlso possible variant to meet to requirements -40C and it is the only one reason to keep OCVCXO onboard.šAlso possible variant with external control panel to make easily IP65 housing design.šAlso DC supply voltage can be in range 8..28V to keep single DC supply if UmTRX will combined with IP65 tower mounted amplifiers.And so on depend of your fantasy :)Here includedšsomešproject files and BOM for variant with 20dBm Tx and onboard control.šPCB and PDF files will be in the next two e-mails.š
Best regards,Andrey Sviyazov.
2012/5/21 Alexander Chemeris <alexander.chemeris@gmail.com>Andrey,
Use this datasheet, here it's marked as output:
On Sun, May 20, 2012 at 6:46 PM, Andrey Sviyazov <andreysviyaz@gmail.com> wrote:
> 1) Is it used somewhere? In the datasheet there is probable errors, for
> example, 1PPS is specified as input.
http://www.transystem.com.tw/product/66/EB-570%20Data%20Sheet%20V1.4.pdf
Probably you have an older version of the datasheet.
Yes.
> 2) There are inputs Reset and Standby. The first can be left open, and the
> second is possible need to be connected to to FPGA.
Could you route it to a test-point or a 2-pin IDC? I don't think we
> 3) There Is RTC_CLK_O we don't need him? And that there may be, 32768?
need this, but it's better to have an ability to access it.
Use TX0/RX0 (pins 13/14), which is default to NMEA - see the datasheet above.
> 4) Which of two UART's better to use or are they equivalent? There are no
> any words in datasheet about it.
Then we have to use EB-570.
> 5) Unfortunately no place for both on PCB and we can use either EB-230 or
> EB-570.
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Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ïïï õÍòÁÄÉÏ
http://fairwaves.ru