WG3K   > ANS      13.04.25 00:30z 39 Lines 2037 Bytes #82 (0) @ AMSAT
BID : ANS103.3
Subj: OpenGD77 Handheld Radio Firmware Aids FM Satellite Operating
Path: ED1ZAC<ED1ZAC<XQ8FGC<CX2SA<ZL2BAU<WG3K
Sent: 250413/0021Z 16192@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.24


An article In ARRL *QST *magazine, April 2025, pages 35 and 36, provides an
overview of an available open source firmware for held-held radios:
According to the article, the free firmware can provide some models of
analog FM and DMR capable radios with satellite capability including
screens showing; polar view graphic, satellite individual predictions, a
satellite alarm and the ability to upload Kepâ€Ös data into the radio.

Doppler tuning and AOS and LOS information were mentioned in the QST
article. View the April 2025 *QST* issue via this link:
https://edition.pagesuite.com/get_image.aspx?w=280&eid=7584fe3f-aae2-450...
.

ARRL members can access *QST* supplementary materials which are available
via this link: http://www.arrl.org/qst-in-depth. Several YouTube videos
about the firmware are live including how to create a code plug for
programming a handheld with GD-77 firmware. This unique firmware was
introduced several years ago.

The GD77 firmware also includes a number enhancements, including easier DMR
related functions. Recent discussion on OpenGD77 was heard via the CSRA
Multimode Tech Net from several satisfied users. Information about the net
is available on their Facebook Group page:
https://www.facebook.com/groups/1138357396634299/

The firmware is now available for use in some models of Radioddity, Baofeng
and TYT model radios and have been successfully used on an Anytone 878UV II
plus handheld.. A GD77 user guide is available via this link:
https://github.com/LibreDMR/OpenGD77_UserGuide?tab=readme-ov-file#readme
and a forum is here: https://www.opengd77.com/

The developerâ€Ös site includes this caution statement, “firmware license
forbids any form of commercial use of the firmware binary or the source
code. Installing the firmware onto the radio will invalidate all FCC
certifications and those of other countriesâ€Ö licensing bodies. However, it
is usually possible to back up and restore the original radio firmware.

[ANS thanks *QST* and David Vine, WA1EAW, for the above information]


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