Re: [ldm-users] NOAAport carrier/noise down considerably since primary switchover


We are still over 15dB at our lab and operational downlink, with our lab
over 16dB most of the last hour.

Having said that, I would caution against calling or emailing NCF
because your dB is not as high as it was previously.  That is a single
measure of the ability to receive data, and not the whole picture.

By illustration, the retransmit rate on the NWSTG channel since the 9th
has been very low - never getting above 5%.  In contrast, prior to the
6th, the retransmit rate on NWSTG bounced as high as 22%, and certainly
several instances over 10%.

NCF will look at the stats of retransmit requests from the 160+ WFO and
RFCs and see they are low and tell you that you have a local issue if
you are losing data, and if you are not losing data, then, "what is the
problem?" will be the more likely response.

I understand that it is vexing to see dB lower than what you feel it
should be, but I also want to prepare you for the likely response at
this given time considering NOAA is not seeing any data reception issues
at their downlinks, based upon retransmit requests.


On 05/12/2012 12:20 AM, Gilbert Sebenste wrote:
> LDM-users who don't have satellite receiver systems for NOAAport, kindly
> hit the "delete" key now. For everyone else and the curious, please read
> on...
> Since the National Weather Service threw NOAAport onto their primary
> uplink (on Wednesday, May 9th, I believe), my signal strength and carrier
> to noise ratio (hereafter C/N) has dropped significantly. My C/N used to
> be around 15 to 15.5 on clear days, 14 on cloudy days...with signal
> strength up around 64 on my Novra S300 receiver:
> The signal strength had dropped to 58, but has since recovered to its
> usual level of 64. But, the C/N is now down to around 13, even under clear
> skies. I wish I had grabbed a screen snap of the spike downward in signal
> strength and C/N the moment they switched over to the primary at
> exactly 15Z that morning.
> Now, as long as the C/N remains northward of 9, I'm OK...but I have
> considerably less "pad" for significant rain fade than I used to
> before. The NWS standard for C/N is 16. Mine was a little less than that,
> primarily due to a snow cover I have on the dish.
> Over at Hamweather, I see their C/N is down to 11.5:
> And Mark Burgus, with a 3.8 meter dish refurbished and placed in his
> backyard (wish I had that! ;-) ) used to blow everyone out of the water
> with his C/N around 16 or 17, but now is down to near where I am:
> So...anyone at NOAA on this list see this going on...or should I just be
> done with it and file a trouble ticket with the NCF?
> Gilbert
> *******************************************************************************
> Gilbert Sebenste                                                    
> ********
> (My opinions only!)                                                  ******
> Staff Meteorologist, Northern Illinois University                      ****
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