[Hackrf-dev] 10MHz clock

[Simon Brown]

Hi Mike,

The ability to sync the hackRF while out portable would be interested for some folks, I haven't looked at low power 10MHz reference sources yet. I hope you'll post here when the Firmware is ready for a 3.3V signal (if not already), I'll post a picture from the Rubidium reference once it arrives.

Simon Brown G4ELI
http://v2.sdr-radio.com


-----Original Message-----
From: Michael Ossmann [mailto:mike at ossmann.com] 
Sent: 22 August 2014 14:21
To: Simon Brown
Cc: hackrf-dev at greatscottgadgets.com
Subject: Re: [Hackrf-dev] 10MHz clock

That one would not work without some circuitry in between.  It would be nice to develop a clock expansion board for HackRF One (and, yes, the preferred capitalization is "HackRF") that permits a variety of input and output options including low voltage sinusoidal signals.  I would also like the board to have a higher stability oscillator and perhaps its own GPS (optional?).

Mike


On Tue, Aug 19, 2014 at 07:54:45AM +0100, Simon Brown wrote:
>
> The rubidium is ‘0.5 V RMS into 50 ohm sinewave’ so I need feedback from the hackRF team here, if it would be OK we’ll buy a few.
> 
> 
> 
> Simon Brown G4ELI
> http://v2.sdr-radio.com
> 
>  
> 
> From: Karl Koscher [mailto:supersat at cs.washington.edu]
> Sent: 19 August 2014 07:49
> To: Simon Brown
> Cc: hackrf-dev at greatscottgadgets.com
> Subject: Re: [Hackrf-dev] 10MHz clock
> 
>  
> 
> According to the HackRF schematic, CLKIN expects a 10 MHz, 3.3V CMOS signal. According to http://www.perdrix.co.uk/FrequencyDivider/, the Thunderbolt has a 2.5V peak-to-peak AC signal, so it needs to be run through a clock shaper to drive the HackRF. 
> 
>  
> 
> But this is just a guess.
> 
>  
> 
> On Mon, Aug 18, 2014 at 11:18 PM, Simon Brown <simon at sdr-radio.com> wrote:
> 
> Hi,
> 
>  
> 
> Would a Thunderbolt signal lock on a hackRF?
> 
> BTW is it hackRF or HackRF ???
> 
>  
> 
> Simon Brown G4ELI
> http://v2.sdr-radio.com
> 
>  
> 
> From: Chris Kuethe [mailto:chris.kuethe at gmail.com]
> Sent: 19 August 2014 07:14
> To: Simon Brown
> Cc: hackrf-dev at greatscottgadgets.com
> Subject: Re: [Hackrf-dev] 10MHz clock
> 
>  
> 
> I was just going to say "Trimble Thunderbolt?" I guess it's not less portable than a laptop and power brick, but that ovenized oscillator is going to be tough to power from USB.
> 
>  
> 
> On Mon, Aug 18, 2014 at 10:54 PM, Simon Brown <simon at sdr-radio.com> wrote:
> 
> Hi,
> 
>  
> 
> Please suggest a 10MHz solution for the clock in, this question has been asked in my Yahoo! group and I have no idea. Is this documented anywhere? Would be interesting to have a portable solution rather than carrying a big Rubidium standard around J . Would my Trimble Thunderbolt work?
> 
>  
> 
> Toodles…
> 
>  
> 
> Simon Brown G4ELI
> http://v2.sdr-radio.com
> 
>  
> 
> 
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> 
> 
> 
> 
>  
> 
> --
> GDB has a 'break' feature; why doesn't it have 'fix' too? 
> 
> 
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>  
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