Question about Connex 3300, Deluxe Amateur Transceiver, 40 Channel AM/FM, Digital LED Indicator

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I have a magnet mount antenna I can't get my swr below 3. company vehicle can't hard mount or drill.

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Buy yourself an astatic PDC-5 antenna matcher and use it to get your match to a 1.5:1 but before you do that is your antenna one that can be tuned by sliding it up or down if so and you can't get it any lower than 3 then get the PDC5 only about 24.00 plus S&H

Posted on May 18, 2014

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: iv got a problm with mt swr i have a magnett mount

What sort of antenna are you using? Wilson, K-40, etc? Also, is the antenna right near any metal or perhaps you have heated rear glass (which means you have thin strips of copper in close proximity to your antenna).

Any of these things can cause enough impedence mismatch to cause your VSWR to rocket skyward.

Posted on Mar 06, 2009

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1 Answer

Cb antenna warning


If your readings are below 0.5 with a dipole that is a excellent swr reading, most fall in the area of 2.0 or higher, you will not harm your RF output transistor, if you are getting antenna warnings see if you can recalibrate it.

May 04, 2012 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

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When i que my mic the display light shows no antenna light unless im touching the antenna i tried this on 2 different trucks


The mounting and adjusting of the antenna is crucial,if it is a magnet mount,the surface must be clean,dry and best to not have any rust,also bottom of the magnet needs to be clean and mount it to the largest area of metal on the vehicle...the trunk lid,middle of your roof are the best.Permanent mounts need to be touching bare metal at the mounting hole not paint,again either mount requires SWR adjustments to match the radio it's attached to,it may require trimming of the metal"whip" if it needs to be lowered for the best reading,also don't rule out the radio chassis might need to be grounded as well.For general safety I would not recommend touching an antenna while it is transmitting any radio signal...if all above is good,you transmit and receive fine,more likely light is faulty or needs it's sensitivity adjusted...Good luck,hope this info helps.

Sep 03, 2011 | Cobra 29 LTD CB Radio

1 Answer

I JUST BOUGHT A COBRA 19LTD CLASSIC I HOOKED IT UP. I HAVE IT HOOKED TO A MAGNET ANTENNA I HAVE USED FOR YEARS AND FOR SOME REASON THE ATTENA LIGHT DID NOT LIGHT UP AT FIRST WHICH I THINK IS GOOD. BUT...


Make sure it is not near another antenna.
Coaxical cable More likely COAX.... moisture, pinched/bent, corrosion at connectors
The no receive condition if it is not radio is mostly likely center conductor find a ground be it coax shield or body
ANTENNA You have not described the type antenna other than magnetic. One piece or base with stinger shaft that screws in if it is the later clean threads an recheck. Move vehicle away from other metal structures particularly if tuning the antenna as it can affect the SWR reading.
I suspect you may just need a new antenna that one's coil or shaft may be broken not obviously visible.
Being that is an magnetic antenna i guess it does not matter which has failed since they are most likely made together. A solid mounted antenna with as much height as possible as long it allows for clearance will always perform best for both RX/TX.

Jul 29, 2011 | Cobra 29 LTD CB Radio

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I have a Midland 1001Z 40-Channels Base CB Radio and a Magnetic-mount CB antenna. 29" stainless steel whip and 6" spring. About 46" high overall. All bought from /www.thesource.ca in Alberta...


Try Grounding it better. Its supposed to equal 8.5 ft.(102 inches) but the coil may make that in all.You can clip like 1/8 inch off at time until it goes 2.1 Swr. Thats a good standard. 1.5 SWR is desired. If it don't have a coil with it that may be the problem. You could turn it into a 8.5 ft. antenna by buying a 102" inch whip to screw into the base of your antenna, it depends if it holds or not. You could build you a matcher like this with a solder gun+solder and 2 resistors. Get you a box with 2 female cb antenna inputs. Drill a hole for both Cb antenna inputs into box. Place them into holes screw nuts down snug. Run a copper wire inside to both grounds or a plate somewhat. Run a thick gauge copper wire from center cb ANT INPUT(2) to other input of ANT INPUT(1). Solder 2 100 ohms in parallel from input to Ground. If you could take apart your radio(eliminating the box idea). Just Solder 2 (100 ohm) resistors to your Antenna output then put it back together. 50 OHM MATCH HERE Is the main idea. I've used 75 OHM Tv coax and reduced SWR.

Apr 04, 2011 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

I can't get the swr value close to 1 it's over 3 what am i mising


Several things are working against you.
1 Antenna location= Needs to be in CENTER of car or truck, and high. no grounded metal can be next to the element (the hot/positve part of the antenna)

2 the only way to really ground the antenna is by having a flat metal ground plane under the antenna. DC grounding does NOT do this, that is a misunderstanding.

3 make sure you use a tunable antenna. I have found the wilson's to be very easy to tune and performe very well, for a base loaded antenna.

4 in short a wilson or k40 magnet mount placed on the very top of the roof in the center will have a perfect ground plane. Then shorten or lengthen the steel whip to ajust your SWR's. You will get the best results this way. This is the ONLY way to achevie good performace.

5 I will say this the absoulte best antenna is the 102"steel whip, if you got the clearnce and dont mind it hitting tree limbs put it on a big magnet mount with a spring at the base and youll have a perfect antenna. But the wilson is shorter and easier to tune.

May 15, 2010 | Cobra 29 LTD CB Radio

4 Answers

Have not used my cobra for some time ...sine someone need my K40 antennae more than me. Just put it back in service with a new magnet mount 36 inch - can send and receive in USB and LSB ....can here in the...


Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

if it dont transmit period on AM, then there's an internal glitch :)

Jan 24, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cant get SWR below 3.5


A ground wire will not replace the lack of ground plane. Try a different antenna altogether (possibly one with a magnet mount) and mount it on some metal surface like even the front hood and retest.

I am sure the problem you will find is with the lack of a proper ground plane.

May 31, 2009 | Cobra 29 LTD CB Radio

1 Answer

High SWR


the problem is in the antenna cable. the lenth of a antenna cable must be divisable by 3. try replaceing cable with a 18 foot cable that should fix the problem.

Apr 11, 2009 | Cobra 19 DX IV CB Radio

3 Answers

Antenna


Checking and setting the swr can only be accomplished with an inline swr meter, not with the radios swr cal switch and the radios meter. Once you have set the swr of the antenna, you cal the radios meter to reflect the actual swr reading and use it like a dummy light on a car, just as an indicator of high swrs. To set your swr:

You must have an inline swr meter, which can be purchased online or from a truck stop. The ones at truck stops are cheap ones, but will do the trick for the most part.

You connect your antenna 18ft coax to the antenna plug of the swr meter, and a jumper coax (any length) to the transmitter plug of the swr meter and then to the radio.

Close all doors and make sure no one is messing around with the vehicle or antenna. You must be set up as you would normally be transmitting.

Now set your cb radio to channel 40 and your swr meter to fwd. Key up your microphone1.gif and at the same time turn the set knob on the swr meter until the needle is at the line that reads set. Unkey your mic and set the the swr meter to ref. Key up again and note what your reading is. Now leave the swr meter in ref and turn the cb to channel 1. Key up and take your reading. If the reading on ch 1 is higher than ch 40 you must raise the stinger on your antenna. If ch 1 is lower than 40, you lower your stinger. You are trying to get lower than a reading of 3 and as close to 1.5 as possible. If you lower your stinger as far into the antenna as it will go and you need it shorter, you cut the bottom of your stinger no more than 1/2" at a time, and recheck your swr reading after each cut.

Once you have gotten the best reading you can, connect your antenna directly back to the radio.

The setting of your swrs is to make your antenna as efficient as possible, by trying to get it as close as you can to a 50ohm impedance. THE ONLY PART OF YOUR SYSTEM THAT CAN CHANGE YOUR SWR IS YOUR ANTENNA, not your coax and not your radio. Your radio and coax can give you false readings, but only the antenna can actually change the swr.

On the swr meter, the fwd/ref switch stands for forward (power that is being transmitted out) and reflected (power that is reflected back into the radio.

Just for information sake, the swr cal switch on your radio is used to set the meter to reflect the swr that your antenna is set at. The meter on your radio is like a dummy light on your car. ONCE AGAIN, YOU CAN NOT SET YOUR SWR ON YOUR RADIO, only the antenna.

Dean
Rollin CBs
Mt. Vernon, TX

Aug 23, 2007 | Cobra 29 LTD CB Radio

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