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@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 <[email protected]
<mailto:[email protected]>> 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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