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Discussion of precise time and frequency measurement

Trimble Lassen sQ / iQ GPS Receivers (ReCap)

Gregory Beat

Tue, Apr 4, 2023 6:19 PM

Week Number Roll Over (WNRO)

On April 6, 2019 there was a GPS week number rollover (WNRO) that
affected all earlier GPS / Timing units in the world, regardless of
manufacturer, that did not handle the New Epoch.

In general, the receiver manufacturers did NOT update their 6 and
8-channel GPS receivers from the 20th century. In fact, many have
exited theGPS receiver marketplace (merger, changing product lines, not
competitive, bankruptcy, etc.).

Owners of surplus Trimble Thunderbolt GPSDO (Red) and purchasers via
the Time-Nuts Group know this situation, and that Lady Heather (WNRO
adjustment) permitted their continued usage.

On September 9, 2004 Trimble announced their new 12-channel Lassen iQ
GPS receivers. This GPS receiver was fully compatible with Trimble’s
earlier (and popular) Lassen sQ series.

[1] https://investor.trimble.com/static-files/909a7dcf-fe1e-4cca-8fc0-7
cdd83346833

Trimble’s WNRO support statement (2017 Product Bulletin)

regarding their Larsen SQ and IQ receivers.

[2]https://trimble.app.box.com/s/h9c5l6jzb851ybjkp7jjkk77xk8mpo1d

Trimble announced New Lassen iQ Firmware version 1.16

May 16, 2006

[3]https://xdevs.com/doc/Trimble/iQ/FIRMWARE%20DOWNLOADS/Lassen%20iq%20
pb%205122006a.pdf

Today, the Trimble Larsen sQ and iQ GPS receivers are End of Life
(EOL).

However, HEOL Design (France) designed and manufacture Trimble clone
replacements, for older equipment designs that internally used these
Trimble receivers (and address WNRO).

[4]https://www.heoldesign.com/Trimble-Lassen-SK2-iQ-sQ-LP-ACE-clone-rep
lacements-boards

I hope that “fills in” the product history of the Trimble Lassen iQ
receiver series.

Thanks to HEOL, equipment using that receiver module can continue its
useful life.

greg beat, w9gb

chicago

References

Week Number Roll Over (WNRO) On April 6, 2019 there was a GPS week number rollover (WNRO) that affected all earlier GPS / Timing units in the world, regardless of manufacturer, that did not handle the New Epoch. In general, the receiver manufacturers did NOT update their 6 and 8-channel GPS receivers from the 20th century. In fact, many have exited theGPS receiver marketplace (merger, changing product lines, not competitive, bankruptcy, etc.). Owners of surplus Trimble Thunderbolt GPSDO (Red) and purchasers via the Time-Nuts Group know this situation, and that Lady Heather (WNRO adjustment) permitted their continued usage. == On September 9, 2004 Trimble announced their new 12-channel Lassen iQ GPS receivers. This GPS receiver was fully compatible with Trimble’s earlier (and popular) Lassen sQ series. [1] https://investor.trimble.com/static-files/909a7dcf-fe1e-4cca-8fc0-7 cdd83346833 Trimble’s WNRO support statement (2017 Product Bulletin) regarding their Larsen SQ and IQ receivers. [2]https://trimble.app.box.com/s/h9c5l6jzb851ybjkp7jjkk77xk8mpo1d Trimble announced New Lassen iQ Firmware version 1.16 May 16, 2006 [3]https://xdevs.com/doc/Trimble/iQ/FIRMWARE%20DOWNLOADS/Lassen%20iq%20 pb%205122006a.pdf Today, the Trimble Larsen sQ and iQ GPS receivers are End of Life (EOL). However, HEOL Design (France) designed and manufacture Trimble clone replacements, for older equipment designs that internally used these Trimble receivers (and address WNRO). [4]https://www.heoldesign.com/Trimble-Lassen-SK2-iQ-sQ-LP-ACE-clone-rep lacements-boards I hope that “fills in” the product history of the Trimble Lassen iQ receiver series. Thanks to HEOL, equipment using that receiver module can continue its useful life. greg beat, w9gb chicago References 1. https://investor.trimble.com/static-files/909a7dcf-fe1e-4cca-8fc0-7cdd83346833 2. https://trimble.app.box.com/s/h9c5l6jzb851ybjkp7jjkk77xk8mpo1d 3. https://xdevs.com/doc/Trimble/iQ/FIRMWARE DOWNLOADS/Lassen iq pb 5122006a.pdf 4. https://www.heoldesign.com/Trimble-Lassen-SK2-iQ-sQ-LP-ACE-clone-replacements-boards