| Products > Test Equipment |
| Unknown GPSDO but BG7TBL logo on the circuit board and OCXO ! |
| << < (4/21) > >> |
| 0xdeadbeef:
Well, yeah, that's better than nothing but hardly a proper documentation. E.g. Diabolo said "It can provide a square or sinusoidal wave by moving a component on the output." I would expect that stuff like this would be described in a manual. As well as things like how long it takes for the OCXO (?) to stabilize etc. |
| ChuckDarwin:
How hot does the case get after it has warmed up: hand warmer, tea warmer, egg fryer? -CD |
| phil_lndn:
Curious to know what the output signal does when it loses GPS signal? I've ordered one of these to stabilise my 23cms transmitter for earth-moon-earth transmissions, it seems likely to me that during my (1 minute) transmit periods, my 23cms signal will block the GPS receiver (which operates on a similar frequency). |
| 0xdeadbeef:
Mine outputs 10MHz from the start. Actually it tends to output something like 9.99999MHz when switched on and then needs quite some time to settle after the green LED stays on and the red one stays off (swings over/under 10MHz over some hours or so). [EDIT] Regarding the temperature: the device case stays cold (room temperature). Even the top of the oscillator enclosure is cold (room temperature). Inside the enclosure the temperature seems to be ~34°C or so. At least that's the temperature of the PCB below the enclosure after some hours. IMHO this is not really an OCXO in the classical sense. The temperature seems too low and it heats up too quickly (power consumption of the power supply drops from ~5W to ~2W very quickly). Probably this is more like a TCXO with an enclosure than a typical oven. [EDIT2] After the GPSDO was off for ~12h, I measured the power consumption during startup again (wall wart). I starts at around 5.1W and falls down to slightly over 2W after quite exactly 1 minute (at 23.5°C room temperature). It then slowly drops and settles at ~1.9W. So there obviously is some kind of heater/temperature regulation but it's a bit too fast for a typical OCXO. Obviously this is related to the observation of rather low temperatures. |
| phil_lndn:
Mine showed up in the post today - pretty sure it's an OCXO, i opened it up after it had been running for a few hours and the oscillator can was noticeably warm. 0xdeadbeef: i did a bit of research on OCXOs and did find a handful of OCXOs advertised as having 1 minute warm-up time, so it's possible I think! So far, I've found the GPS locks in about 1 minute, and the red 'alarm' LED goes off after about 5 minutes, indicating that it's on frequency. |
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