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Old 08-07-2013, 06:07 AM   #31
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Quote:
Originally Posted by wyotraveler View Post
Do you have an ohm meter? ! Walmart has a vom for about $17. Harbor freight has them for about $6. The firestick mount I see a pictur of is black. Is that a paint coating on it? With your antenna cable disconnected from the CB unit end and that end of the cable not touching anything and hanging loose measure the resistance at the antenna end (by your tail light) outside of coax to a good ground on the vehicle. You should have zero ohms. Then measure the resistance at the CB end of the coax. Between ground and center conducter. Should be an open circuit i.e. not shorted. If that bracket has a powder coating on it and not electrically conductive through the paint (appears black in the picture I saw) it would be why the CB worked and why the fuse blew when you transmitted. The CB would receive but if not grounded the SWR would be real high.
I have an ohm meter but haven't tested the cable yet. The black on the antenna is a plastic that is how it comes. I removed the paint from both the back of the antenna mount and where that meets the frame of my jeep. It's metal to metal contact.

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Old 08-07-2013, 06:46 AM   #32
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Does the base look like this?


It's important to get the isolator, washer, and lock washer on in the right order. And to make sure you haven't tightened it down so hard you crushed through the isolator. The TOP of the antenna has to be isolated from ground, and the BOTTOM has to be firmly grounded to the mount. If either of those is reversed you will have bad range and may damage the radio.

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Old 08-07-2013, 07:06 AM   #33
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I was refrring to the black bracket that mounts to the Jeep tail light assembly. One in the picture I saw was black in color. Is that painted? That bracket should be making a good ground to the Jeep chassis. Plus the instructions should have an initial setting for antenna length adjustment. The spring and center conductor of antenna should not be grounded. If the outside of the coax is not picking up a good ground at the tail light your SWR will be off the chart. I'm concerned if you don't have a good ground and you get the CB repaired you'll have the same problem again. I would bet the fuse blew because there is a problem with the antenna installation.
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Old 08-07-2013, 07:14 AM   #34
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Does the base look like this?

It's important to get the isolator, washer, and lock washer on in the right order. And to make sure you haven't tightened it down so hard you crushed through the isolator. The TOP of the antenna has to be isolated from ground, and the BOTTOM has to be firmly grounded to the mount. If either of those is reversed you will have bad range and may damage the radio.
If that is the mount I agree there should be some metal showing on that end of coax that touches the metal bracket. That bolt and center conductor should be isolated from ground.
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Old 08-07-2013, 07:34 AM   #35
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Everything is assembled like just like the picture. I'll mess around with it and double check everything today after work.
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Old 08-07-2013, 10:49 AM   #36
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If this picture posts this is what it should look like electrically.
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Old 08-07-2013, 11:14 AM   #37
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If this picture posts this is what it should look like electrically.
Looked at the diagram and I think I'm missing what looks like the ground strap.
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Old 08-07-2013, 06:58 PM   #38
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This is my setup
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Old 08-07-2013, 07:10 PM   #39
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In that picture the coax connector on the bottom of bracket. Does the outside of connector have a solid ground connection to jeep frame? On a 1/4 wave ground plane that outer coax shield has to be grounded. I did see in instruction #2 they mention a ground strap.
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Old 08-07-2013, 07:13 PM   #40
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In that picture the coax connector on the bottom of bracket. Does the outside of connector have a solid ground connection to jeep frame? On a 1/4 wave ground plane that outer coax shield has to be grounded. I did see in instruction #2 they mention a ground strap.
No. It has no connection to ground. Just the stud
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Old 08-07-2013, 07:56 PM   #41
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Are you saying that the outside of the coax connector does not touch the mounting braket therefore not grounded? If that is the case your swr was out of sight. But it would still receive. I suspect that is why you blew the fuse.
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Old 08-07-2013, 08:22 PM   #42
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Are you saying that the outside of the coax connector does not touch the mounting braket therefore not grounded? If that is the case your swr was out of sight. But it would still receive. I suspect that is why you blew the fuse.
That's correct. So it attaches from the stud above the coax to any part of the frame?
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Old 08-07-2013, 08:43 PM   #43
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The outside of coax, usually the part that screws on should touch the bracket and be grounded. The firestick only touches the center conductor and insulated from the frame. Usually the mount is constructed to automatically ground the coax. Don't know why your mount isn't.
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Old 08-07-2013, 08:47 PM   #44
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Ok. I think I know what to do
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Old 08-07-2013, 08:55 PM   #45
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I'm going to look on internet and see if I can find some examples for you.
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Old 08-07-2013, 09:29 PM   #46
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Cool man. Thanks.
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Old 08-07-2013, 10:05 PM   #47
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I read all the stuff on firestick. They have some unique ways connecting theirl ground. If you go to their web site they show what is inside the firering as they call it.

I would call them and try to get some tech help. If it is 5/8 wave it won't require as much of a ground as a 1/4 wave requires. They would certainly be more knowledgeable about how they designed the antenna.
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Old 08-08-2013, 07:13 AM   #48
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Your mount doesn't look like the Firestick II mount in their instructions. Did you use a different type mount?
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Old 08-08-2013, 07:28 AM   #49
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Yea. I have the treraflex left tail light mount. I read up on firestiks website last night and gained some new info but I'll give then a call today and see what's up.
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Old 08-08-2013, 12:12 PM   #50
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OK I saw a photo of a 3/8 24 to SO239 mount. Note the nylon washer and collar for top of bracket. On the bottom nothing so the outside of the SO239 connector touches the bracket. The bracket is grounded. The 3/8 24 stud is insulated from ground by the nylon washer. On that same site they also show the same thing in a heavy duty model for couple of dollars more. This is what I am going to use to mount the antenna to my ladder for a CB in my motorhome. For 2 meters I am just going to use a piece of coat hanger and ground plane also off of the rear ladder. I'm cheap.

3/8-24 to SO-239 SM1 Antenna Stud Mount Adapter
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Old 08-08-2013, 07:35 PM   #51
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Talked to Firestik. They told me everything is hooked up correctly. I just put an ohm meter on a bolt to the tub and a screw that holds the mount to the tub and continuity was good. Also put the the meter on both ends of the coaxial cable and that checked out fine too. My only guess is to wait until my swr meter comes in and check that.
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Old 08-08-2013, 07:50 PM   #52
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When I started reading the info I realized it was not a ground plane and they had a unique way to connect their coax.
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Old 08-08-2013, 07:57 PM   #53
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Quote:
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When I started reading the info I realized it was not a ground plane and they had a unique way to connect their coax.
Yea. That's what he said to me. The cable is ground internally. As long as the back of the mount is bare metal to the tub that's enough.
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Old 08-08-2013, 08:21 PM   #54
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I think I know how they connect it internally. I'll post a pix when I'm on computer tomorrow.
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Old 08-08-2013, 09:42 PM   #55
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was the radio "tweaked" if so then your pulling 5 amps.
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Old 08-08-2013, 09:55 PM   #56
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was the radio "tweaked" if so then your pulling 5 amps.
Tweaked?
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Old 08-09-2013, 05:02 AM   #57
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Thinking maybe by he is referring to CB being tuned for more power output. I guess some do it. Others buy illegal amplifiers etc.

If all was set up correctly we still don't know why you blew the fuse. I do suspect it took the final transistor with it. Of course it is hard to check swr if cb doesn't work unless you have other equipment.
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Old 08-09-2013, 09:27 AM   #58
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I suspect the antenna is loaded as shown in the photo. Kind of a unique mickey mouse way of doing it. Very hard to trouble shoot problems if there is a shorted or open turn in the coil. You need one of the Mighty Fine Junk SWR analysers like shown to make sure you are good to go before connecting your transmitter. Just a humble opinion about Firesticks and Firerings after working on and building ham antennas for almost 60 years. Guess I'm just getting too old and grumpy.




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Old 08-09-2013, 08:51 PM   #59
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Hooked up the swr and this was my reading.
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Old 08-10-2013, 06:13 AM   #60
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Is it all working ok now? Receiver and transmitter? If so you were were very lucky. However, I'm still a little skepticle. Fuses just don't blow for no reason. If everything was hooked up correct why did the fuse blow?

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