| Products > Test Equipment |
| Unknown GPSDO but BG7TBL logo on the circuit board and OCXO ! |
| << < (5/21) > >> |
| 0xdeadbeef:
It's probably a matter of definition. A new high precision OCXO would cost more than the whole device. Besides there isn't any marking whatsoever on it. I'm too lazy to open it again, but as far as I recall, my impression was that the metal casing was open on the lower side. So my guess is that they put some half decent XO or TCXO with some heater element (resistors or power transistor), temperature sensor and opamp under a metal hood to get a somewhat stable temperature. Then again, while you could call that an OCXO, it's not what is usually meant by an OCXO. |
| phil_lndn:
Just found a bit of a problem with these - the 10MHz output signal is very dirty. Listening to it on my HF radio receiver, it sounds like it's modulated with a bunch of low frequency clock signals - I notice the unit has a switching power supply built on to the PCB so it could be noise from that i guess :-\ This probably does not matter for some applications but I'm pretty sure it writes the unit off for use as a stable reference in radio equipment (which is what I was going to use it for). Dang. :-\ |
| Diabolo:
Hello, Here is an Ocxo that is very similar to the one (?) Installed. Note that the consumption (mA) is very low compared to Oxco larger sizes, and that the heating time is short. - https://www.digikey.fr/product-detail/fr/abracon-llc/AOCJY5-10.000MHZ/535-11306-ND/2642491?utm_adgroup=&mkwid=s&pcrid=255466061978&pkw=&pmt=&pdv=c&gclid=EAIaIQobChMIn-qTxIX42QIVBLftCh3Lbg0UEAYYBiABEgJdtvD_BwE - http://www.abracon.com/Precisiontiming/AOCJY5.pdf Note also that the board is also designed to receive a Ocxo version "dip 14". - http://www.abracon.com/Precisiontiming/AOCJY1.pdf - https://www.digikey.fr/product-detail/fr/abracon-llc/AOCJY1A-10.000MHZ-E/535-10657-ND/2441423?utm_adgroup=&mkwid=s&pcrid=255466061978&pkw=&pmt=&pdv=c&gclid=EAIaIQobChMIn-qTxIX42QIVBLftCh3Lbg0UEAYYBSABEgJe6vD_BwE Regards, Diabolo |
| 0xdeadbeef:
I guess we can agree that there's no new high precision 150€ OCXO in a 90€ GPSDO. Even in the more expensive larger versions with FPGA, the guys in China who create/assemble these things use old OCXOs or even boards salvaged from GSM equipment and the like. But actually they never remove the markings from the OCXOs and they advertise the OCXO with weird terms like "above than OCXO 2 order of magnitude" which I never saw for one one these cheaper/smaller devices. So I dunno. Maybe these are salvaged lower spec OCXOs or something created in some Chinese backyard. I guess someone would have to take one of these oscillators apart and analyze its construction to be sure what it really is. |
| texaspyro:
I've seen OCXO's in TO5 packages... if you want to know what they cost, you can't afford them. |
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