I just installed my Icom V8000 and I want to know what a good SWR would be? Also, other than adjusting the antenna up and down, how else would you lower the SWR?
Wow, you dont have a clue what your talking about do you?Your best bet is to take the unit and antenna to a pro and have them tweek and peek it. That way all you have to do is install, with no mods to worry about, and you will have max preformance. Also give them the SWR meter so it is part of the Cal process.
from the above, and since you didn't bother to respond to my question at the end of this post in which i provided all of the info you needed,I just installed my Icom V8000 and I want to know what a good SWR would be? Also, other than adjusting the antenna up and down, how else would you lower the SWR?
sure you can.A good SWR would be a theoretical 1:1, but you'll never get that low.
the OP did not specify what kind of mount he is using. an NMO mount, for example, is inherently grounded. a magnet mount, on the other hand, is capacitively coupled to the underlying sheetmetal. in either case, using a "ground wire" at ~146MHz isn't going to do anything for your SWR. perhaps at CB frequencies, ~27MHz, yes. but not in the 2M amateur band -- it will not help and may in fact hurt the SWR. a properly installed mount with the correct antenna for the application (read below) will never require a supplemental ground.Grounding is very important; use excessive grounding braid/wire to ground the mount.
depending on the type of antenna he chose (again, not specified), this could be worst idea ever. most mobile antennas depend on a suitable ground plane for the best radiating pattern, and also for the best impedance match to the radio. for these reasons, mounting the antenna atop the cab will generally provide optimum range and optimum radiating pattern. if mounting atop the cab is not possible, the antenna MUST be specifically selected as to not be ground plane dependent. a 1/2 wavelength radiating element is typically used in cases where you want to mount the antenna to a bedbar or similar. for 2M applications, this means a 39" or so antenna.Make sure it is away from obstructions. If possible, mount it at the back of the bed, so that you aren't emitting right next to the cab.
at 2M frequencies (~146MHz), anything farther than about 1 lambda isn't going to make any difference whatsoever. so 2M, approx 6 feet, is all you need to any surrounding structures.When you tune it, do it away from buildings.
AMP or Amphenol, nothing from radio shack.Use high quality cable/components.
cut off the excess cable. don't worry, it won't screw up your SWR or make you dog go bald. cut off the excess and attach a quality connector.Don't coil the excess signal cable.
on a vehicle? with a nearby lightning strike, voltage gets induced both onto the antenna AND onto the car body. where, in this case, is "ground"? where are you going to ground the arrestor to? both the antenna and the car body are at the same voltage potential -- therefore the arrestor has the same voltage on both (the signal and ground) sides of it. hence, it does nothing, and can do nothing.Install a grounded spark arrestor on the signal cable.
?If you are getting really picky, grease the threads inside the antenna mount (if applicable).
To Answer your question wrooster I do not have an ameture radio licence. I help out with several desert race teams and I need to comunicate with the teams when I'm chasing them. The radio will ONLY be used when I'm chasing for those teams. I know this is not an excuse to not get a licence, I'm just telling you what I'm using the radio for. The teams I chase for already have the radios set from PCI and we'll only use those channels.None of that does anything to change the fact that you are bootlegging on MY ham bands.
Get a ticket BEFORE YOU KEY UP!
you are lazy and arrogant, and unlawfully using amateur radio frequencies. if my buddies and i were out offroading and were interfering with one of your desert races, you'd be on our asses in two seconds about how we (a) didn't know what the hell we were doing, and (b) we should find somewhere else to play since we were interfering with your race. why do you think you should get some kind of special treatment?To Answer your question wrooster I do not have an ameture radio licence. I help out with several desert race teams and I need to comunicate with the teams when I'm chasing them. The radio will ONLY be used when I'm chasing for those teams. I know this is not an excuse to not get a licence, I'm just telling you what I'm using the radio for. The teams I chase for already have the radios set from PCI and we'll only use those channels.
that's all very nice but i am not helping you break the law, use frequencies which you are unlicensed for, and use frequencies which you may interfere with other amateur operations.I mounted my antenna on my cab, in the same spot you mounted yours. I drilled a hole so my antenna location isn't going to move any time soon. I got my radio from Ham Raido Outlet and the antenna and coax from McKenzies. I'll need to check the specific brand of the antenna and cable. Right now I'm getting between 1:2 and 1:2.5 on my SWR meter, I know the lower the SWR the better, but what is an okay SWR?
that is nonsense.If you have some type of protective layer underneath the magmount antenna, then it isn't capacitively coupled to the sheet metal beneath it (also not accounting for the x number of layers of paint).
there is an immense difference between a DC ground and an RF ground. at high frequencies, such as the amateur VHF range (~146MHz), a piece of "ground" wire longer than about 1/20 wavelength (10cm in this case, just under 4") is not doing what you think it is doing -- it is not a "ground".If it is mounted towards the back of the bed, odds are it is going to be on a bedrail. A bedrail does not provide an adequate ground plane (nor is it a decent grounding point), not to mention if he has some type of bed liner, that's not going to help, either. Thus my advising for excessive grounding braid/wire.
unlike the 3/8" stud mount typically used on CB radio antennas, the NMO mount typically used on VHF amateur radio is completely watertight (via integral Viton rubber gaskets) and will not freeze up no matter what the weather does.And the grease in the mount? I assume you have never driven in rain in which once it gets in the mount, freezes?
ok, you didn't tell us the whole story. those frequencies are not in the amateur 2M band allocation of 144.000 to 148.000 MHz.Our race frequency is 153.695MHz, we have 154.600, 166.375, 155.400, and 155.970 for an emergency. Most race frequencies range between 150.000 to 155.000 depending on the area.
Your right. But it's better than no one trying?Wow, you dont have a clue what your talking about do you?