Question about RCA F27TF700 27" TV

1 Answer

Input coax fitting shows continuity to ground braid

As soon as outer ground touches fitting signal goes dead

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  • parkhurst Jun 19, 2008

    cannot get a picture unless male fitting is pulled out so ground does not touch female ground on F27TF700

  • parkhurst Jun 19, 2008

    The cable does not show any continuity to ground only the input jack on set. I wonder if the jack for the 3 wire hookup is also shorted. This set is ia my trailer at the lake.

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  • 4,234 Answers

There is a problem with either the cable itself or the tuner. I would suspect that there is a broken connection inside the tuner. This set should be brought to a service center unless you can solder.

Let me know what you want to do and I'll supply more info.
Dan

Posted on Jun 19, 2008

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1 Answer

Cobra radio transmits but won't receive


Check coax continuity with a VOM/ continuity tester. Make sure the braid and center conductor aren't touching. OR, put the radio on an antenna system that is known to be working and see if receive works. If after these tests you still don't hear anything, You may need to talk to a repair technician.

Aug 25, 2016 | Cobra Radio Communications

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Does the watt meter go in line on the coax.?


yes I normaly make a coax patch lead about 6 to 8 inch long and sit it on top of the radio, if your making your own lead make sure the braiding outer don't connect with your inner wire.

Dec 25, 2012 | Cobra 29 LTD CB Radio

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I have a cobra29 LTD Classic and the ant warning led lights each time I key the mike. I have the radio mounted in an overhead dash, the radio is grounded to the truck via the power plug. That ground goes...


A VSWR meter is your best bet. They are cheap for cb's . If the antenna is badly mismatched you will get an antenna warning lamp on. If the antenna has a tuning coil you will see usually continuity to ground from the whip. Use the vswr meter on the radio. Set to calibrate first, transmit on channel twenty while rotating the swr cal knob. set needle on orange triangle at top right of scale. Select VSWR mode and transmit. needle should move up slightly if antenna is tuned correctly. Try chaneel 1 and 40 with same procedure. You can tell if antenna is tuned more toward the high or low frequency by how high the needle is on the scale. The higher the reading the worse the match is. If there is always a high scale reading then try another antenna that you know works.Watch for flattened/damaged/water in between braid and jacket or corrosion on coax as this will change the coax impedance drastically

May 13, 2012 | Cobra Radio Communications

1 Answer

When i unkey my mic, my swr lights come on. sometimes they flicker sometimes the dont, what is wierd is sometimes they stay on for a seccond or two and the meter show full


VR9, VR2 or VR15 may just be out of adjustment. This does assume you are transmitting signal and recieving.

It might not hurt to check with second SWR meter.

Depending on location, there is only a tiny possibility of residual capacitance causing this. However you might want to put a few neon bulbs around your base to monitor for stray RF. If there is stray RF, they will light up- no need to connect them to anything, you can tape them to convenient places you can see. If they do light up- check coax connectors- which you should really do as a routine anyway, and check coax for damage. Then add a flat braid strap ground to "earth bond" for the radio. Which you should have anyway,

Feb 08, 2012 | Galaxy Radios DX-95T Base CB Radio

2 Answers

Can't talk long distance seems I can only talk for a hundred yards and then I can't hear other drivers


  • Hi, I can help.

  • The most important part of a CB set up is the antenna and the coax/connectors being used. Make sure your antenna is a good one. If you want a suggestion on a good one leave a comment with your budget and weather your using a mobile/base set up. Make sure your connection is goo. Check the PL259 and make sure the braids have not split off for inside. Soldier a new one on if necessary.

  • I will give you some instructions to peak your CB and adjust the receive. Make sure the CB ha no power and use a plastic screwdriver inside your radio.

  1. Pull the bottom cover off of your radio.
  2. Put a watt/power/SWR meter inline.
  3. VR1 is your receive gain, adjust that to pick up from farther away. Note white noise can occur along with this as you will be sensitizing the front end.
  4. Adjust VR4 for 100% modulation (swing)
  5. Right by the final is a can with some glue on it. Scrape the glue off and turn that ferrite out until your power output is 4 watts RMS (not bird)
  6. Your Cobra 29 is now peaked and tuned as much as possible without using a Oscilloscope. And doing this this way will not require a re-alignment afterward.
  • Don't touch any other pots in the radio.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Sep 19, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a Monster cable running from my receiver to my sub. The end broke of and it has a braided copper shield like coax and the in the middle it has two seperate jacketed wires in the middle. One is...


Is this CABLE with RCA plugs? The best way is to Ohm out the two wires and the orher end od the cable to see if the inner two wires are tied together or it is using double ground connections. The braid wire is for the shield/ ground fro sure.
If you want to use the binding post , you need to feed it from the speaker output terminals of the receiver since the binding posts are made for speaker level signal, not audio line level used for the RCA jack (much lower signal level than the speaker level).

Jun 21, 2011 | Televison & Video

1 Answer

In middle of concert epiphone stopped, took it apart where plug goes in wire came off , but can't figure out where to solder it back, it is one wire with outside ground?


If it is a coax with a wire in the center and a shield outside, the wire will attach to the contact that touches the tip of your plug you insert. The shield will attaach to the part that touches the sleeve of you plug. inspect the jack carefully as they can be foolers. When stripping the insulation back un-braid the shield a little to be able to solder it to the jack. Use a pair of needlenose and a helper to keep soldering heat from going up the braid and melting the insulation of the internal wire. Test unit before putting cover on.

Apr 25, 2011 | Epiphone Les Paul 100 Electric Guitar

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Fitted new 6000cd aerial to 04 reg Mondeo, cant get reception any ideas please.


Can only be the coax input to the radio. Often the fault is that the soldered end is faulty at either the radio or the aerial end. If you have a voltmeter, check for shorts by putting each cable to the inner and outer coax wires. They should not be touching. If they are and the two ends are clear of each other it is likely a cracked cable inside. The easiest fix is to just use 12V wire or coax - as long as the two coax plugs are connected to the inner and outer, you will get a connection the the aerial. If you are getting ZERO reception then it is likely the cable is shot. Even if the aerial isnt connected, the cable itself should act as an antenna.

Dec 19, 2010 | Car Audio & Video

1 Answer

Broken input jack wires, which wires go were on the jack


If it's a two wire jack, the tip contact is signal, the sleeve contact is common ground (or minus).

If there is a coaxial wire, the center wire is signal and goes to the tip contact, the braided shield is ground and goes to sleeve contact.

If there are two ordinary wires, you need to measure with an ohmmeter / continuity tester which one is connected to the common ground (minus) - that will be the sleeve and the other wire will be the tip.

regards

3rq8 (Triarcuate)

Sep 08, 2009 | Music

1 Answer

Coax seems shorted


OK TAKE THE COAX OFF THE CB AND CHECK THE OUT SIDE AND INSIDE FOR CONTINUITY 0 OHMS IT IT DOES NOT SHOW 0 OHMS THE COAX IS GOOD. YOU ARE READING THE CIRCUIT INSID -E THE RADIO AND IS NORMAL.

Mar 13, 2009 | Cobra 29 LTD CB Radio

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