I just installed my xpr5550e in my 21 Silverado crew cab 2500HD. I had this radio and same antenna on my 17 Silverado crew cab 1500. A Laird BB4505CR. The only thing that has changed is the Coax. I was using RG8X. now im using LMR-240. both are roof mount installs. On the 17 I had swr of 1.2 on 467.725 and 1.5 on 462.5500. now i have 2.1 on 467.725 and 1.3 on 462.5550. 2.1 is not acceptable to me. would the different length of coax make a difference? I had to use probably 5 more feet on the 2500. The 17 had no sunroof so the antenna was in the middle. the 2500 has a sunroof and has a 16" ground plain. Being the swr on the higher channel is higher i guess i could shorten the antenna but i have another antenna. A Laird Technologies UTRA4301S3NB that i wanted to use but the swr on that is just about the same. I solder my 1st nmo roof mount. is it possible i screwed it up? I checked it with My Fluke 88V and had no continuity between center and outer.
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WRFV510
I just installed my xpr5550e in my 21 Silverado crew cab 2500HD. I had this radio and same antenna on my 17 Silverado crew cab 1500. A Laird BB4505CR. The only thing that has changed is the Coax. I was using RG8X. now im using LMR-240. both are roof mount installs. On the 17 I had swr of 1.2 on 467.725 and 1.5 on 462.5500. now i have 2.1 on 467.725 and 1.3 on 462.5550. 2.1 is not acceptable to me. would the different length of coax make a difference? I had to use probably 5 more feet on the 2500. The 17 had no sunroof so the antenna was in the middle. the 2500 has a sunroof and has a 16" ground plain. Being the swr on the higher channel is higher i guess i could shorten the antenna but i have another antenna. A Laird Technologies UTRA4301S3NB that i wanted to use but the swr on that is just about the same. I solder my 1st nmo roof mount. is it possible i screwed it up? I checked it with My Fluke 88V and had no continuity between center and outer.
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