HFU HF Underground

Loggings => VHF/UHF Logs, including satellites and radiosondes => Topic started by: Dr. Amp on December 07, 2013, 2309 UTC

Title: NOAA-15 APT anomaly
Post by: Dr. Amp on December 07, 2013, 2309 UTC

Seems like every time I'm receiving NOAA-15 lately, about halfway through the pass the visible sensor will change gain (or something), going from a normal image to either almost all black or almost all white.  The infrared image is unaffected, and NOAA-18 and NOAA-19 don't behave like this.  I assumed that something was broken on the satellite, but the POES status page doesn't say anything about it.  What's going on?

Title: Re: NOAA-15 APT anomaly
Post by: n6spp on December 10, 2013, 0521 UTC

Pope Jim-

What is your 137mhz setup rcvr/ant/decoder etc?

thanks, Eric
(I use to run the poes-wx apt decoder here..but its been a year now)

Title: Re: NOAA-15 APT anomaly
Post by: Dr. Amp on December 11, 2013, 0113 UTC

Homemade QFH antenna, RTL dongle, SDR#, WXtoIMG.

Title: Re: NOAA-15 APT anomaly
Post by: Dr. Amp on December 26, 2013, 1827 UTC

After much searching (no thanks to Yahoo's USELESS new forum system), I found the answer on the WXSat mailing list.  Apparently, as the satellite crosses from day to night it switches the visual channel to a near-infrared channel.