johna
Well-Known Member
Raymarine RL70CRC plus Display directly connected to 2KW Raydome on Mizzen mast, no intermediate cable joints.
Working until recently now “Scanner not Responding”. Between the time it was working and now I have been replacing the deck in the area of the cable and did slide (force) the gland along the cable. No sign of physical damage but could this have damaged the cable screen? Below are the results of investigations carried out so far.
Downloaded Answer to SNR from Raymarine site. Check requirements from answer are:
1) Resistance in data I/O cables Display end to Raydome (cable connected at Raydome) 160 ohms (+/- 5 ohms) Measured 169.9 ohms.
2) Resistance in data I/O cables Raydome end to Display (Power off but interunit cable connected to display) 160 ohms (+/- 5 ohms) measured 165.4 ohms.
3) Minimum required voltage at Raydome with radar in standby 10.7 volts. Measured 12.4 volts (shore power connected through charger)
Discussions with Greenham Regis suggested we remove all equipment and send for testing.
Start removing of earth strap from cable shield to dismantle the raydome and the scanner starts and display shows a radar scan. Redo strap and scanner stops. All suspect cable entries and exits twisted, pulled etc to check for intermittent fault but to no avail.
Many further tries at starting radar with the SNR error each time however we noticed that at the end of the 3 second power down the scanner started revolving.
Voltage checks indicate as follows: Radar on scanner not working voltage at Raydome end of cable varies between 12.2 and 12.8. At the end of the 3 second Power down scanner starts and voltage drops to 11.8.
Also noticed that after the 3 second power down there was a ghost image of the “power down notice” on the display while the scanner was turning. Subsequently I have not been able to see the ghost image.
I am a civil engineer not electronic but it appears to me that something in the raydome is robbing the scanner of power until the component is switched off.
Greenham Regis Marine are trying to find me a cable to connect direct as a further test. If there is anyone in Poole with a spare cable I would appreciate a loan for testing initially and may be purchase if required.
In the mean time if anyone can shed light on the likely problem assistance would be greatly appreciated.
Working until recently now “Scanner not Responding”. Between the time it was working and now I have been replacing the deck in the area of the cable and did slide (force) the gland along the cable. No sign of physical damage but could this have damaged the cable screen? Below are the results of investigations carried out so far.
Downloaded Answer to SNR from Raymarine site. Check requirements from answer are:
1) Resistance in data I/O cables Display end to Raydome (cable connected at Raydome) 160 ohms (+/- 5 ohms) Measured 169.9 ohms.
2) Resistance in data I/O cables Raydome end to Display (Power off but interunit cable connected to display) 160 ohms (+/- 5 ohms) measured 165.4 ohms.
3) Minimum required voltage at Raydome with radar in standby 10.7 volts. Measured 12.4 volts (shore power connected through charger)
Discussions with Greenham Regis suggested we remove all equipment and send for testing.
Start removing of earth strap from cable shield to dismantle the raydome and the scanner starts and display shows a radar scan. Redo strap and scanner stops. All suspect cable entries and exits twisted, pulled etc to check for intermittent fault but to no avail.
Many further tries at starting radar with the SNR error each time however we noticed that at the end of the 3 second power down the scanner started revolving.
Voltage checks indicate as follows: Radar on scanner not working voltage at Raydome end of cable varies between 12.2 and 12.8. At the end of the 3 second Power down scanner starts and voltage drops to 11.8.
Also noticed that after the 3 second power down there was a ghost image of the “power down notice” on the display while the scanner was turning. Subsequently I have not been able to see the ghost image.
I am a civil engineer not electronic but it appears to me that something in the raydome is robbing the scanner of power until the component is switched off.
Greenham Regis Marine are trying to find me a cable to connect direct as a further test. If there is anyone in Poole with a spare cable I would appreciate a loan for testing initially and may be purchase if required.
In the mean time if anyone can shed light on the likely problem assistance would be greatly appreciated.
