Message-ID: <3AED88C4.A6FA7EE0@aleph.gsfc.nasa.gov> Date: Mon, 30 Apr 2001 15:46:12 +0000 From: Dr Tom Clark Organization: NASA/GSFC To: IGLOS CC: Robert Snow Subject: [IGLOSMAIL-269] Ashtech Z-18 Firmware Sender: owner-iglosmail Precedence: bulk ****************************************************************************** IGLOS Electronic Mail 30 Apr 08:46:23 PDT 2001 Message Number 269 ****************************************************************************** Author: Tom Clark Rob Sherwood and I have had a discussion about Z-18 Firmware and the overflow of Carrier Phase when GBSS is used to make the RINEX files. I gave Rob the fix that Z-18 firmware release 6.5 fixed the problem here at GODZ and Rob reported that most of the European Z-18s are still running 6.4 (which has the overflow problem). The problem shows up when the Hatanaka compressor fails after a few weeks of operation when F14.x format numbers spill over to a length of 15 characters. A temporary fix is to cycle the receiver power (resetting the cumulative phase counter), but the real fix seems to be to upload the new firmware. Since it appears that some Z-18 owners have not learned about the 6.4 => 6.5 upgrade, I have made copies of the software available at URL ftp://aleph.gsfc.nasa.gov/pub/z18/ In that directory you will find 2 files -- 18p_0065.dat is the binary receiver image and upld.zip contains the Windoze-based binary file uploader. Thanks to Robert Snow and Bob Lemoine at Ashtech for providing this firmware upgrade. Hope it helps you all. Regards, Tom