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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.

"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.  :-+

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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