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Re: LF: Transmitting from a NEO-M8N ??

To: LF Group <[email protected]>
Subject: Re: LF: Transmitting from a NEO-M8N ??
From: Riccardo Zoli <[email protected]>
Date: Sat, 28 Jul 2018 23:29:20 +0200
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Hi Stefan, Andy, VLF.

A year ago, I wrote to LF group some informations about U-center, the management software by Ublox for NEO-x and LEA-x modules:

"Use "U-center" (by U-blox -
https://www.u-blox.com/en/product/u-center-windows) to pre-configure
the module.
After connecting it, it's necessary to set the navigation mode and
minimum elevation of sats (thanks to Domenico for the advice).

Go to...
- Menu - View
- Configuration view

- Select item "NAV5 (Navigation 5)" (left side)
- Set Dynamic Model to "Stationary" (right side)
- Set Min SV Elevation to 10 degrees
- Press Send button

- Select item "TP5 (Timepulse 5)" (left side).
- Select Frequency and Duty Cycle mode (right side)
- Set Duty cycle values (50% normally)
- Set QRG values Frequency and Frequency Locked (in Hz) ...
- Press Send button

...obviously we need GPS module status ALWAYS in locked mode to obtain
a valid coherent signal...

- Select item "CFG (Configuration)" (left side)
- Select "Save current configuration" (right side)
- Select all Devices (in particular I2C-EEPROM) by keeping pressing Shift key
- Press Send button

Now the module is programmed."

Then, close U-center.
Now you can send, via serial UBX protocol, specific commands to set your frequency (with 1 Hz step).
The complete protocol is explained in this document (have a look at page 133):


In particular, have a look also at page 221 (UBX-CFG-TP5 command specifications).


So, have fun with Raspberry and your new NEO GPS module.




All the best

73 de Riccardo IW4DXW





Il Sab 28 Lug 2018, 11:42 Andy Talbot <[email protected]> ha scritto:
Is there a simple command to set the frequency 


On 27 July 2018 at 13:01, DK7FC <[email protected]> wrote:
Hi all,

Today i received my new GPS module NEO-M8N which is the latest generation offering some advanced features. It was quite cheap at amazon, just 18 EUR or so!

Does someone know if there is some software to control the module to transmit WSPR or even EbNaut by using periodic commands over the serial interface, driven from e.g. a Raspberry Pi? It should provide a perfect VFO signal and it is easy to amplify the signal to drive a linear mode or switch mode PA...

73, Stefan


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