have two cobra radios been tinkering with , i test on the bench with a dummy load and dead key 4 -5 watts , swing about 35 to 38 on my cheapee meter , any way go install them in the big truck and still get the same dead key , but will only swing about 15 to 20 , swr 's are almost 1.1 1.2 , new power cord . wilson 2000 ant. , so i don't get it , whats the difference between testing on the bench @ 12.8 volts and the truck?
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ok what s going on?
- Thread starter tylerdaddy2007
- Start date
ground issues ,(lack of)
reflection?
need more info on the truck single ant , or co-phased
trailer on / off cab composition - fiberglass / aluminum ect ,standup sleeper, air dam
antenna, is the coil above roofline? if so how much
reflection?
need more info on the truck single ant , or co-phased
trailer on / off cab composition - fiberglass / aluminum ect ,standup sleeper, air dam
antenna, is the coil above roofline? if so how much
???????????? , explain
the truck is 2002 volvo flat top sleep single ant. mounted on a bird perch, screwed in to the driver door., wilson 2000 ant. the coil of the ant. is about 6 inches above roof line.
volvo trucks are a pia to get a antenna set up rite on.
the "bird perch you say is screwed to the door rite? not bolted.
if you were using the factory coax in the mirror i d say that would be the first place to look at .
but with a perch screwed to the door , i would suggest bolting it to the door with star washers and install some ground straps from door to cab and from cab to frame, as the cab is mounted on airbags / rubber mounts lack of groundplane will cause issues similar to what you are experiencing, that or replace the factory coaxial to the mirro mounts as the factory coax is crap
screwing the perch may attach the mount , but doesnt carry an rf ground bond adequate for rf transmission
the "bird perch you say is screwed to the door rite? not bolted.
if you were using the factory coax in the mirror i d say that would be the first place to look at .
but with a perch screwed to the door , i would suggest bolting it to the door with star washers and install some ground straps from door to cab and from cab to frame, as the cab is mounted on airbags / rubber mounts lack of groundplane will cause issues similar to what you are experiencing, that or replace the factory coaxial to the mirro mounts as the factory coax is crap
screwing the perch may attach the mount , but doesnt carry an rf ground bond adequate for rf transmission
Measure the resistance of that dummy load. If it's close to 50 - 52 ohms, then it's about as right as most of them are. I would have to say that the antenna(s) on that truck are not tuned very well, no matter what an SWR meter says. Try the same using an antenna analyzer and see how much reactance is there, that's the biggy. Do the same for that dummy load.
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