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Stupid Antenna Mounting to the next level!
- Thread starter psycho
- Start date
Hello Psysco:
Looks like it needs more ground plane. Temporarily add some 9 Ft long wires from the base ground and lay the wires and see if that lowers the SWR. If so ya need more ground plane area.
Jay in the Mojave
Looks like it needs more ground plane. Temporarily add some 9 Ft long wires from the base ground and lay the wires and see if that lowers the SWR. If so ya need more ground plane area.
Jay in the Mojave
Absolutely a ground plane issue.......the antenna is grounded to the exhaust stack!
I have never seen an antenna system mounted to an exhaust system before and maybe that's the reason. I know getting a good solid ground is tough on a fiberglass skinned rig but there are a bunch of better ways than that.
From what I see there may be a grounding issue fo rthe simple fact that most truck exhaust are mostly mounted on rubber mounts but the real issue with that antenna is that you have removed the bottom shaft section and that will not allow you to tune that antenna no matter where you mount it.
Those antennas come with 5''/10'' or 24'' shaft and is meant to use it and if you've removed it you will not easily get that antenna to tune.
Those antennas come with 5''/10'' or 24'' shaft and is meant to use it and if you've removed it you will not easily get that antenna to tune.
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From what I see there may be a grounding issue fo rthe simple fact that most truck exhaust are mostly mounted on rubber mounts but the real issue with that antenna is that you have removed the bottom shaft section and that will not allow you to tune that antenna no matter where you mount it.
Those antennas come with 5''/10'' or 24'' shaft and is meant to use it and if you've removed it you will not easily get that antenna to tune.
Looks more like a Wilson 1000 trunk mount to me. I'm using a very small screen computer right now but could it be one of these:
From what I see there may be a grounding issue fo rthe simple fact that most truck exhaust are mostly mounted on rubber mounts but the real issue with that antenna is that you have removed the bottom shaft section and that will not allow you to tune that antenna no matter where you mount it.
Those antennas come with 5''/10'' or 24'' shaft and is meant to use it and if you've removed it you will not easily get that antenna to tune.
The bottom of a wilson trucker coil is not flat and that coil looks flat. He must have jury rigged a 239 connector on that base. A lot of effort wasted on his part.
Anyone notice the bracket holding the vertical 'angle-iron' straight? It may be bolted tot he stack, but it's also bolted to the frame with that angled thingy (not sure what to call it). I've also read the thread where this picture came from, and from that, it's grounded to the truck's frame.
I think this 'groundplane' thingy is sort of getting out of hand, kind'a. Sure, a 'ground', or counterpoise, or radials, or ?? is necessary in almost all cases, but it seems to be the "answer" to most antenna problems lately.
- 'Doc
I think this 'groundplane' thingy is sort of getting out of hand, kind'a. Sure, a 'ground', or counterpoise, or radials, or ?? is necessary in almost all cases, but it seems to be the "answer" to most antenna problems lately.
- 'Doc
B
BOOTY MONSTER
Guest
i agree . seems like so many places all you see are folks saying to add tons of ground straps . without even trying to determin or locate the cause of a problem first .
Well the way I see it you've found another issue without any background on what the problem is which makes this thread pointless.
Who is his? where did his post this? is his not getting an answer where his posted this?
If it is a roof mount antenna then his definately has a counterpoise issue and with the roofs of most modern trucks being fiberglass his countpoise issue will not be easily solved without some metal in the direct vicinity of that antenna.
Please in the future bring more information and less look at what this idiot has done to his install.
(edit).... the real issue with that antenna is that you have removed the bottom shaft section...
Those antennas come with 5''/10'' or 24'' shaft...
RF ground and ELECTRICAL ground are two seperate issues.
kind of hard to tell from the picture exactly what type antenna it is, but,... if it is a "center-loaded" antenna with-out the extension riser piece installed , then that is a major performance problem... (note "performance".... it has nothing to do with "VSWR", it's about efficiency). if the antenna won't "tune" then there are other problems.
to increase performance and minimize the coil losses, the loading coil should be at or near the center of a whip antenna.
Xl must equal Xc for a whip antenna to achieve resonance. the loading coil is used to tune out capacitive reactance.
If that antenna is a wilson5k/1k it will have to have to be in near vicinity to a source of counterpoise because of it being shunt fed which is not present in that picture and if it's a wilson trucker 5k/2k which is not shunt fed then it and it's missing shaft section become an active part of the feedline.
I suppose he could try adding 18'' more coax to try and transform the difference.