Question about Cobra 148 GTL 120-Channels Base CB Radio

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I need to know the test point number and location to check the vco alignment

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Posted on Sep 09, 2010


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1 Answer

Cobra 1000 will not receive or transmit.

Sounds like a problem with the VCO / PLL Circuit since nothing happens in RX or TX. Check to make sure you have the correct supply voltages to start with and also check to see if you have 10.240Mhz. Use the service manual and go through the PLL/VCO alignment section. If anything is missing then you at least know where to look.

Apr 30, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Ranger rci 2950 no am hash and sometimes loses lsb hash and wobbles on recieve and transmit

hmmm my money is on a cold or several cold solder points,,
start checking the legs on the PLL first...

Oct 03, 2011 | Ranger Communications RCI-6900F-25 CB...

1 Answer

I have a 29ltd transmitt that i know of, recieves but is weird soundin, like people are underwater...recieves on PA, or CB..and channel 19 comes thru on all channels..??? could it be just the...

Sounds like the mixer crystal has gone bad, or the VCO is out of whack, and the radio needs to be aligned.

worst case scenario is that the PLL has gone bad. In which case the radio will need to be fully aligned after replacing.

Nov 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

Hello, i was given a cobra 25ltd classic to look at.. put it on freek counter keys up around 24,25 mhz with the last few numbers flutering around it will not stay still. when modgulated into it goes down...

Does it seem to be talking on the right channel??

Check to see if D10, which is supposed to be an N1004 diode, and see if it's been replaced with a jumper.

If that's the case, then the final is volted. This mod gains some wattage but can make a radio dirty. Putting an N1004 back in may fix the issue.


Usually the radio will deadkey on the right freq.

The VCO could be off, and the radio may need to be aligned. Could the person you got the radio from have randomly turned VR's in the radio trying to mod it?

Without an ocilliscope you cannpt fully align the radio, but if you have a volt meter and a watt meter, you can do some of the alignment.

here is an alignment guide.

But if you can hear people on the correct channel, and they can hear you fine, it could be just a volted final.

Nov 07, 2010 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

My 2950 transmits on 1 channel higher when first turned on what causes this?

the radio needs to be aligned. The VCO may be unlocked.

What ever is not in alignment is off ever so slightly so that when you turn it on, its off freq, but once it warms up it is on, because some parts will slightly change values due to heat or temperature change.

It may also be a resistor that is loosing its value some where in the mixing circuit. Its off until it gets warm because it is going bad.

If you know what you are doing you can track it down with an ohm meter. Each color code is a different value. If the resistor is not what the code says it is, then there is a problem.

You should take it to a tech to have it aligned. In most cases, because its of and or the VCO is off, it can drift until its been aligned again and the VCO is locked up.

Apr 04, 2010 | Ranger RCI-6900F-25 CB Radio

1 Answer

I have a Connex 3300 HP that transmits on frequency but receives a around 15 kc's off. The problem is not a VCO problem. Radio will not align through any adjustments. My common sense tells me that it is a...

I had a firend that had one,I think his had a crystle
oven in it (it's what's used to keep the freq. stable)
I don't know how old yours is ?
Maybe this will help

Sep 04, 2009 | Radio Communications

1 Answer

Cruise Control

My Answer:

I've only seen Cruise Controls have 1 or possibly 2 wiring problems by design.

Usually the Cruise Control Servo Unit itself if pretty darn dependable, and will outlast most everything else on the SUV/car.

The most common problem is usually a BAD GROUND wire at the CC Servo Unit itself, which is located under the hood and usually where it's mounted off to the drivers side at or near the engine firewall, or else up front nearest the battery box.

The other wiring problem might be a bad connector or dirty connection point from where the wiring harness is run into and under the steering column. That connector can be seen from under the dash area and checked pretty easily with a DVM for proper function.

With either an automatic transmission or clutch driven model there is one other "safety disengage switch" located on either the clutch pedal or else the brake pedal, and this switch (if it's not positioned properly, or defective - as in OPEN) will kill the +12-volt battery POWER going to the CC Servo Unit itself. The CC light may be ON, but there still won't be any battery power to the CC Servo Unit, causing it not to set.

On all newer generation CC units the vehicle "angle" or attitude sensor, and drive shaft VCO pickup sensor design were dropped, and instead the monitored engine speed is now taken directly from the engine's Black Box computer and used as the VCO reference. If this VCO signal is missing then the CC Servo Unit will not engage as well.

If the CC Servo Unit uses a vacuum line feed you'll need to check that as well to make sure the hose is intact and it's making a good snug connection.

If all these points show to be good - then the CC Servo Unit itself is bad and needs to be replaced. Make sure you troubleshoot everything else above first as the CC Servo Unit is no doubt pretty pricey in cost, and may not be bad at all.

Hope this solves your problem.


Aug 06, 2008 | 2003 Jeep Grand Cherokee

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