I i may repeat some things that Rob said, but this should walk you through it.
a couple of things first:
1. im assuming that your equipment all works properly.
if you bought it used, there is a chance that it does not.
2. your radio might have too high of a deadkey for your amp.
(the deadkey is the amount of power ((watts)) that your 29LTD puts out when you key the microphone but do not speak into it. a "dead" key)
if it does, then you will have to modify the radio to work with the amp.
the mod needed is called a "swing mod" and is pretty easy to do.
we will deal with how to do it in another thread.
lets get started.
mount the 29LTD where you want it, and run the positive power wire right to the positive terminal of the battery. (MAKE SURE to fuse the positive lead right at the battery to prevent fires)
find the closest spot to where your radio is mounted that is part of the chassis of the vehicle. (make sure its not just a small metal panel somewhere but actually is attached to the body and frame of the vehicle. a good determiner is if you see other things grounded to that same metal.)
attach the negative wire from the radio to this metal keeping the wire as short as possible. around a foot is great, try not to make it over 2 feet or so.
now you want to mount your antenna.
i dont know of that cobra antenna you have is a magnet mount or not, but if it is, just stick it in the center of the roof of the vehicle. if you stick it on the trunk or some other low spot, you will not get out as far and might have SWR problems.
if its not a magnet mount antenna, then hard mount it, but you might want to start another thread with all the specifics of your particular installation and get some help mounting it properly.
ok, now connect the coax from the antenna to your external SWR meter using the connector on the back that is labled ANT (ANTENNA).
you need to have a couple of coax jumpers for your install.
dont buy them at radio shack.
buy a couple on ebay that are either 3 foot or 6 foot, whatever works for your install. they should be made of RG-8x (also called RG-8 mini) coaxial cable.
make sure whoever you buy from actually solders the connectors on.
using one of your jumpers, connect one end to the SWR meter using the connector on the back that is labeled RADIO, or, INPUT, or whatever.
connect the other end of the jumper to the back of the radio.
now, turn the radio on, and set it to channel 20. make sure the CB
/PA switch is in the CB
turn the DYNAMIKE (microphone gain) all the way down. (counterclockwise)
SWR SETTING PROCEDURE:
now set the knob on the TR-1000 meter to "SWR SET".
look at the meter on the TR-1000. you will see three different scales of measurement. the one that goes from 0 to 1000 is for measuring wattage.
the middle one is for measuring SWR (Standing Wave Ratio, which we are working with now), and the bottom one is for measuring modulation.
key the microphone and using the knob on the TR-1000 labeled "SET ADJUST" turn the knob until the needle goes all the way over to the right and aligns with the mark on the middle scale labeled "SWR SET".
unkey the mic and be sure not to bump the SET ADJUST knob during these next few steps.
turn the switch on the TR-1000 to the "SWR" position, key the mic, and make a note of the reading on the meter. (write it down!!!)
ideally, the meter would not move to the right at all, that would be a perfect 1 to 1 ratio. (almost unattainable in the real world.)
anything over 2 means you might have an antenna problem, but we'll get there later.
now, set the radio on channel 1, and go through this whole SWR SETTING procedure again.
make a note of the reading.
set the radio on channel 40 and go through the whole SWR SETTING procedure again.
make a note of the reading.
now, if your reading is higher on channel 1 then your antenna needs to be adjusted to be a bit longer.
if its higher on channel 40, the antenna needs to be a bit shorter.
adjust the antenna in 1/4" increments. you will have to re-calibrate the meter each time you make any change, whether it be changing the channel on the radio or adjusting the length of the antenna.
try to get the SWR to be about the same on both channel 1 and 40 and it should be below 1.5.
if you cant get it below this, then you either have a mounting issue or need a new antenna. ( i highly recommend the wilson 1000 or 5000)
i have to go now, but will continue with this tomorrow evening.
good luck and please post your results if you try this before i continue.