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Hans,

An update.

I managed to do these.

1. Use shielded cable between GPS and U3S.

2. Tried 3 different power supplies. 2 SMPS and 1 Linear

There was no change and I had to change the gps check parameter to 0 to get 3D fix.

regards

Manoj VU2CPL

On 12-Sep-2017, at 12:53 PM, Manoj Kumar <vu2cpl@...> wrote:

Hans

Sent from my iPhone

On 12-Sep-2017, at 12:37, Hans Summers <hans.summers@...> wrote:

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.?

Both in same u3s deluxe case.?

Connection is not shielded. Will change and let you know.?

Power supply is clean as far as I can tell. But will try a battery.?

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.?

Please give me a day to check this.?

Thanks?

Manoj VU2CPL

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...