开云体育

Hello Manoj

If disabling the checksum validation fixes the lack of 3D fix information - then it suggests a hardware issue, not firmware. It does not conclusively suggest it - there still may be a firmware issue/solution... but the first thing to check is hardware. Do you have some separation between U3S and QLG1, and use shielded cable between them? And a clean power supply etc.?

If noise is getting into your serial data and the checksum validation consequently fails, then suppressing the invalid data is exactly what is supposed to happen.?

73 Hans G0UPL

On Tue, Sep 12, 2017 at 9:47 AM, Manoj Kumar <vu2cpl@...> wrote:

Hi Hans,

On 12-Sep-2017, at 11:28 AM, Hans Summers <hans.summers@...> wrote:

Hi all

Can someone clarify please: does this happen with the QRP Labs QLG1 GPS ? Or only with other GPS modules??

Mine is QLG1 which came as a part of U3S Deluxe kit and it suffers from no 3D display.

Does the checksum disable fix it??

Yes.

I am curious as to whether it is just some noise on the line, which makes the checksum validation fail - in which case this is just a hardware issue specific to some people's installation; or, is it something to do with the ordering of the items in the GPS sentence - so that perhaps if they arrive in different order, or at slightly different times, then for some reason the U3S misses them. In the latter case, this could be resolved by a firmware change and I could investigate it.?

It will be great if you can go into this.?

73

Manoj VU2CPL

73 Hans G0UPL

On Mon, Sep 11, 2017 at 2:32 PM, Daniel Ekman (kng) <knegge@...> wrote:

My point was that a quick search in the forum would have given this answer much quicker, rather than waiting for someone glued to the computer to answer it again (:

On Mon, Sep 11, 2017 at 12:53 PM, Michael Lloyd <mikell@...> wrote:

Could be that it was already discussed but some of us aren't glued to the computer anxiously waiting for an email...