USRP2 and OsmoTRX

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Rafael Diniz rafael at riseup.net
Tue Jan 16 02:08:25 UTC 2018


Thanks Alex! I ended up buying this one:
https://www.ebay.com/itm/182974939864

Lets see.
; )

On 01/15/2018 06:07 PM, Alexander Huemer wrote:
> Hi!
> 
> On Mon, Jan 15, 2018 at 01:14:07PM -0200, Rafael Diniz wrote:
>> Do you know if this GPSDO would work:
>> https://www.ebay.com/itm/GPS-Receiver-GPSDO-10MHz-1PPS-GPS-Disciplined-Clock-SINE-WAVE-GPS-RECEIVER/262981677836?hash=item3d3aedf30c:g:8HUAAOSwxu5ZD~MH
>>
>>  Feature:
>>
>> POWER:DC12V 1.5A
>> GPS ANT POWER:DC3.3V
>> 1PPS OUTPUT:Square WAVE,3.3Vpp
>> 10M OUTPUT :SINE WAVE,1Vrms (13dBm+-2dB)
>> RS232 OUTPUT:GPS NMEA SIGNAL
>> SIZE:W*H*D=107*55*120mm
>> ACCESSORY:AC110-220-DC12V ADAPTER,GPS ANT.
> 
> Well, I don't have experience with this particular device.
> Observations:
> * Power level of 10MHz output is right, according to [1].
> * Waveform is the desired square.
> * There is no specification of accuracy. Assumption is that it's good 
>   enough, but I think it's worth noting that there is no statement.
> * The 1PPS output is a nice to have, though voltage is too low to be 
>   inside spec of the USRP2. I don't know how likely it is to be working 
>   anyways.
> 
> Have you considered using an OCXO for simplicity reasons?
> There are reasonably priced boards on eBay that have an OCXO and just 
> the necessary components around to run it, like [2,3]. Those should be 
> sufficient regarding accuracy, though output waveform is sine, which is 
> acceptable but not ideal.
> I have just invested 2 minutes in research. I am sure even better 
> suitable options can be found easily.
> 
> Kind regards,
> -Alex
> 
> [1] https://files.ettus.com/manual/page_usrp2.html
> [2] https://www.ebay.com/itm/182994166409
> [3] https://www.ebay.com/itm/252755180989
> 

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