[Lowfer] Daytime lowfers

[N8OOU]

Garry, JD, Other interested readers;

My testing  of the U3S frequency drift, has me fairly convinced of the 
source of this problem.

I had set the U3S GPS Calibration parameter the same as what I use on 
the HiFER. That controls how much of a correction is made within the 
calibration window. In looking at Garry's 11/15 capture the middle WM 
transmission dropped about .4 Hz. I had the correction parameter set to 
a maximum of .2 Hz. The GPS calibration that happened after the "M" 
could recover only about half of the frequency lost from the Sun warming 
the metal building. So the next transmission started off too low, and 
continued to drop as the warming stayed ahead of the GPS correction.

When I started the beacon, and confirmed that GPS was working I saw how 
it was trying to reset the frequency .2Hz at a time. It was about 3Hz 
low, and with the calibration happening every 25 minutes, it was going 
to take a long time to correct. I increased the calibration factor and 
it then came back on frequency in two cycles.

I don't believe there was/is a hardware problem, just an operator setup 
error. Dummy load testing will continue for the next few days.

73   de   N8OOU - Mike Meek

On 11/15/2015 10:04 AM, Garry and Linda Hess wrote:
> Mike, sorry to say if your frequency is under GPS control it's doing a
> lousy job. Don't see any difference in frequency behavior from
> yesterday. Attached is a capture from around 8 am local time this
> morning. The downward drift has continued and the "idle" frequency is
> now around 185298.6 Hz.
>
> 73, Garry, K3SIW, EN52ta, Elgin, IL
>
>
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