Thread to collect all the bg7tbl information into a single reference.
A chinese ham "
bg7tbl" designed and manufactured a series of cheap GPSDO which are being sold on alibaba and ebay, typically for around $150USD.
There are a number of different versions, which can be identified by the date printed on the front panel:
"2014-11-06"custom board with surplus russian
morion mv89 OCXO. gps is u-blox. both sine and square wave output variants available.
"2014-12-09"custom board with surplus russian
morion mv89 OCXO. gps is
u-blox NEO-6M-0-001.
"2015-07-08"custom board with surplus oscilloquartz star 4 (oscilloquartz
"STAR 4") gpsdo board. OCXO is oscilloquartz 8663-XS. gps is u-blox
LEA-5T-0-002.
"2015-07-17"custom board with surplus trimble "57963-D" gpsdo board. OCXO is trimble 73090. gps is unknown.
"2015-09-17"custom board with surplus russian
morion mv201 OCXO. gps is u-blox
NEO-6M-0-001"2015-09-17" (variant 1 - mv89a)
custom board with surplus russian
morion mv89a OCXO. gps is u-blox
NEO-6M-0-001"2015-09-17" (variant 2 - bliley nvg47a1282 )
custom board with surplus
bliley nvg47a1282 OCXO. gps is u-blox
NEO-6M-0-001"2016-05-31"custom board with surplus
bliley nvg47a1282 OCXO. gps is u-blox
NEO-7M-0-000AVR dump available in
this post.
"2017-03-29"custom board with surplus cts 970-2178 OCXO. gps is u-blox
NEO-7M-0-000"2017-09-23"custom board with unknown OCXO. gps is unknown. compact design.
"2017-10-09"custom board with surplus cts 970-2178 OCXO. gps is u-blox
NEO-7M-0-000"2017-12-16"custom board with unknown OCXO. gps is unknown. backlit LCD display.
"2019-09-23"custom board with surplus
bliley nvg47a1282 OCXO. gps is unknown. compact design.
"2017-10-20"custom board with unknown OCXO. gps is unknown. backlit LCD display.
"GNSS-RB"GNSS disciplined Rubidium oscillator? gps is unknown. backlit LCD display.
construction quality of these devices is quite decent in general. the custom adapter models (oscilloquartz, trimble) of course have a number of bodge wires.
you get RS232, 1PPS and 10mhz outputs. wallwart PSU and active GPS antenna are included.
all in all, these are great value for the money and a lot less hassle than some of the alternative GPSDO options being thrown around on the forums.
