[Hackrf-dev] advice on a txco to buy?

[Giuseppe Marullo]

I was needing (and still searching) for a txco for the HackRf but I 
would like something internal to the box, not sure about what is sold on 
Ebay. Anyone could recommend something that surely would fit inside the 
Standard enclosure?

Anyway if you really want to address the problem, spend a little more 
and use something like this one:

https://www.ebay.it/itm/Trimble-GPS-Receiver-GPSDO-10MHz-1PPS-GPS-Disciplined-Clock-sine-and-square-wave/252162780444?hash=item3ab612ad1c:g:PqcAAOSww-Baabwy

It is a second hand trimble gpsdo module, enclosed with a aluminum box, 
add this antenna:

https://www.ebay.it/itm/Maxrad-GPS-TMG-26N-26db-gps-timing-antenna-antenne-N-female/232793495105?hash=item363392d641:g:XOgAAOSw5VFWMReh

and you could have like 10ppt (parts per trillion) accuracy if you keep 
it powered on for several days.

Most important part is that it self checks accuracy, and depending on 
the module inside (at the moment trimble not Symmetricom beware) you 
should be able to use Lady Heater (http://www.ke5fx.com/heather/readme.htm).

Another alternative is QRPLabs:
https://qrp-labs.com/progrock.html plus
https://qrp-labs.com/qlg1.html

cheaper but in kit and without enclosures.
I have both, and generally they are very good for the price. QRPLabs is 
off by like 2Hz at 10MHz, didn't have the time to investigate why.



Subscribe to time nuts mailing list if you want to know more (*much* 
more, possibly even too much) about timing:

www.leapsecond.com

Cheers!

Giuseppe Marullo
IW2JWW - JN45RQ


On 06/13/2018 11:06 PM, Chuck McManis wrote:
> Orrin,
>
> I expect that if you continue in your journey in software radio you 
> will find that a solid 10Mhz reference to be a good thing to have in 
> general. (which you can use to drive the HackRF). I ended up getting 
> an RF signal generator from Crowd Supply 
> (https://www.crowdsupply.com/era-instruments/erasynth) which works 
> really well for this and I can use it with all of my SDRs in addtiion 
> to the HackRF.  A friend of mine recommended this one 
> (https://www.tindie.com/products/AnalysIR/10mhz-ocxo-frequency-standard-module-or-kit/) 
> which is basically $77 when you get all the parts and it is assembled) 
> so lower cost but equally movable from SDR to SDR.
>
> Cheers,
> --Chuck
>
>
>
>
> On Tue, Jun 12, 2018 at 3:33 PM, Orrin Winton <orrin.winton at gmail.com 
> <mailto:orrin.winton at gmail.com>> wrote:
>
>     Hello folks, have had my HackRF for about a week and am going thru
>     Michael's tutorials & other tutorials. Love this device.
>
>     Are the eBay items described as "New External TCXO clock PPM 0.1
>     for HackRF One GPS Applications GSM/WCDMA/LTE" for $10-12 the
>     appropriate part to buy? (noob here)
>
>     Or can some similar item be bought that has SMA jacks on it and
>     can be connected via cable to the jack on the rear of the HackRF?
>
>     The $10 clock looks like it'll require leaving the top half of the
>     case off, is why i ask.
>
>     At 434 MHz doing hackrf_transfer i'm getting 700 to 1000 hz drift
>     (downwards in freq) on a replayed CW signal, in ten minutes, which
>     (if i'm calculating this correctly) is 1.6 to 2.3 ppm.
>
>     I'm being careful to use the correct antenna on the HackRF, keep
>     gains low, and use low xmit power (2W) on my amateur transceiver
>     across the room (to record an rf_transfer). Possibly i should put
>     an attenuator on the 2W radio.
>
>     Thanks for comments.
>
>     Orrin in NE Calif.
>
>
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