When mounting my radome for the JRC 1500 MKII radar, I had to cut the cable (10 conductor wire) to get it into my boat. I have asked JRC's tech support via email what is the best way now to get things back together and to the display unit, but no response as yet. I was wondering if anayone else has encountered this same issue and how they resolved it. Any help or advice would be appreciated. Thanks. George s/v French Kiss
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Terminal Strip
If your radar antenna is mast mounted, hopefully you cut the cable at the base of the mast because that is a good place to seperate it when the mast needs to come down. That said, get a terminal strip or strips that will accomodate all of the conductors. Strip the covering back to fan out the wires and strip and connect them. Beware that you should have one small coax in the bundle. You must get the shield and center conductor seperated when connecting. Some tech support folks will tell you that you can't splice the cable this way, but most installations will have a splice at some time in their lives and it does work. Bill
If your radar antenna is mast mounted, hopefully you cut the cable at the base of the mast because that is a good place to seperate it when the mast needs to come down. That said, get a terminal strip or strips that will accomodate all of the conductors. Strip the covering back to fan out the wires and strip and connect them. Beware that you should have one small coax in the bundle. You must get the shield and center conductor seperated when connecting. Some tech support folks will tell you that you can't splice the cable this way, but most installations will have a splice at some time in their lives and it does work. Bill
Try jameco
for the cable ends. They have lots of connectors and most of the manufacturers use standard ends. Look on the still attached end to see how many holes/pins it has and duplicate that. I have found that starting in the center and working out is best but there are other ways of doing it. Good luck
for the cable ends. They have lots of connectors and most of the manufacturers use standard ends. Look on the still attached end to see how many holes/pins it has and duplicate that. I have found that starting in the center and working out is best but there are other ways of doing it. Good luck
Watch out for high SNR
Do not splice the coax via a terminal strip. You will introduce an impedance discontinuity in the antenna line that will cause power to be reflected back to the transmitter. What gets reflected back does not get transmitted. Id does not take much of an impedance discontinuity to reflect more power back to the transmitter than what gets transmitted. Power reflection will work the other way too when you receive. When receiving, power will get reflected by an impedance discontinuity in the antenna line back to the antenna, causing a reduction in the power that reaches the receiver. This results in a reduction in received sensitivity. The solution: find out what kind of coax you are using and buy a splicing kit for it from Radio Shack. Every boat owner with a radio aboard should own a coax stripping tool. The tool makes an otherwise difficult task trivial.
Do not splice the coax via a terminal strip. You will introduce an impedance discontinuity in the antenna line that will cause power to be reflected back to the transmitter. What gets reflected back does not get transmitted. Id does not take much of an impedance discontinuity to reflect more power back to the transmitter than what gets transmitted. Power reflection will work the other way too when you receive. When receiving, power will get reflected by an impedance discontinuity in the antenna line back to the antenna, causing a reduction in the power that reaches the receiver. This results in a reduction in received sensitivity. The solution: find out what kind of coax you are using and buy a splicing kit for it from Radio Shack. Every boat owner with a radio aboard should own a coax stripping tool. The tool makes an otherwise difficult task trivial.
Give them a call
Find the number for JRC and give them a call. I have had some dealings with a guy there named Patrick. Very nice guy, very knowledgable and helpful. They have an 800 number I think
Find the number for JRC and give them a call. I have had some dealings with a guy there named Patrick. Very nice guy, very knowledgable and helpful. They have an 800 number I think
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