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bg7tbl gpsdo master reference

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usagi:
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-0-000
AVR 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.

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.  :-+

usagi:
"2014-11-06"

most extensively tested, so far (by ke5x and others).

known bug, output frequency is not exactly 10mhz (9,999,999.999800Hz). this translates to ~2hz error at 100ghz.  ;D

http://www.ke5fx.com/gpscomp.htm

usagi:
"2014-12-09"

review by tim tuck / VK2XAX

usagi:
"2015-07-08"

surplus oscilloquartz gpsdo.
uses oscilloquartz star 4 board.
bg7tbl "uccm board" dated 2015-06-27. appears identical to board used for the trimble.

rs232 interface is READ-ONLY. you cannot control the ublox with it, only monitor it.

usagi:
"2015-07-17"

surplus trimble gpsdo.
appears to use same "uccm board" as the 2015-07-17 (oscilloquartz) model.

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