CALLISTO status report #13, Revision A of 2005-08-09

To:
Arnold O. Benz	ETHZ	benz@astro.phys.ethz.ch	
Tim Bastian	NRAO	tbastian@nrao.edu	
Richard F. Bradley	NRAO	rbradley@nrao.edu	
Erin Mastrantonio	NRAO	emastran@nrao.edu	
Peter Messmer	TXCORP	messmer@txcorp.com	
Hansueli Meyer	ETHZ	meyerh@astro.phys.ethz.ch	

From:
Christian Monstein	ETHZ	monstein@astro.phys.ethz.ch	

Improvements Host-PC
-	New: FITS header entry ‘origin’ created, e.g. ETH_Zurich_Switzerland or NRAO_Green_Bank
-	Frequency axis labeling improved regarding local oscillator offset
-	New: check of log- and data- paths. If path does not exist, data will be stored in local directory
-	New: better visualization of frequency file upload into EEPROM of Callisto
-	New: disabling of serial commands to non-existing focal plane unit (if in manual mode)
-	New: frequency file upload into EEPROM accelerated

NRAO

•	The USB ports on the designated PC didn’t work; Callisto was then connected to the standard RS232 port COM1: → solved. Reason unclear; possibly Firewire instead USB (?)
•	The attached cable (black) was of crossed type instead 1:1 → solved
•	Download of Callisto software went wrong due to incorrect DOS-ZIP instead of WinZip → solved.
•	Data file error blocks Callisto if OK-button is pressed too late → will be solved in next upgrade.
•	ATmega16 software (c- and h-files) missing on website → solved
•	It was unfortunately not possible to get a fixed IP-address as required by ETH
•	It was unfortunately not possible to get an FTP-server installed as required
•	It was unfortunately not possible to get an VNC-server installed as required
•	Thus remote operating, remote maintenance and external data download are not possible due to NRAO-internal security reasons.

AOB

•	With existing components it is possible to manufacture either 2 double receiver spectrometers or 4 single receiver spectrometers. → To be discussed…
•	In view of the upcoming IHY we ordered additional receiver just in case we had to copy CALLISTO in large (>2) quantities.
•	Several receivers checked with different rf-gain (fixed AGC-voltage)
•	Studies ongoing to replace fixed resistors for offset- and gain adjustments to be replaced by electronic resistors controlled via I2C bus.