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Forum: How CB radio works 01-19-2011, 11:31 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Your welcome,I have a ques.does the tx run thru...

Your welcome,I have a ques.does the tx run thru the center pin of coax or the shield?
I kno its a stupid one but on the diagram it looks like the rx is coming thru the center conductor ???


Good...
Forum: How CB radio works 01-19-2011, 11:30 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
In the following pic you can see the path of the...

In the following pic you can see the path of the receiver through the "front end" of the radio. Also shown in dark green is the local and fundamental frequency paths to the...
Forum: How CB radio works 01-19-2011, 11:30 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Now, what to do now eh? You are probably thinking...

Now, what to do now eh?
You are probably thinking "thats not much to go on, you left out half the radio".

Well, yes and no.
This is the basic workings of a receiver and transmitter. If you will take...
Forum: How CB radio works 01-19-2011, 11:30 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
The transmitter. TR 20 (OSC) sends a 10.240 Mhz ...

The transmitter.

TR 20 (OSC) sends a 10.240 Mhz (Reference freq) signal to IC 3 (TX mixer). With the channel selector set to channel 1 a set of frequencies of 16.725 to 17.165 Mhz (fundamental...
Forum: How CB radio works 01-19-2011, 11:29 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
The Receiver This looks so complicated. And...

The Receiver

This looks so complicated. And over whelm the new person trying to read the schematic. So lets block this together to make it a bit easier.

Let’s get to know what is happening...
Forum: How CB radio works 01-19-2011, 11:28 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Testing components is a very important part in...

Testing components is a very important part in radio repair. Test equipment can get a bit pricey. As LC mentioned you can check transistors and diodes with a simple analog volt meter or a digital...
Forum: How CB radio works 01-19-2011, 11:27 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Ok, Back to the radio... No Receive. Each...

Ok, Back to the radio...

No Receive.
Each question will be followed by a NO and YES answer.

Is there hash in the speaker?

NO Run you finger over the audio chip or do the metal probe on pin 4....
Forum: How CB radio works 01-19-2011, 11:26 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Ok, Here is out network to complete the output...

Ok,
Here is out network to complete the output stage of the generator. As you can see the divide by 10 stages can daisy chain from each other. Each section must be in it's own sealed box. All...
Forum: How CB radio works 01-19-2011, 11:26 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Tonight I am looking at showing you all how to...

Tonight I am looking at showing you all how to convert a cobra 29 into a stable signal generator.
I will put what I can together and try to get this layed out. The generator will need to be 50 ohms,...
Forum: How CB radio works 01-19-2011, 11:26 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
What are all these components ?? I know when you...

What are all these components ??

I know when you are first starting out you look in a radio and say wow. These things are packed full of stuff. Let me see if I can help you out a bit.

TR 1- RF AMP ...
Forum: How CB radio works 01-19-2011, 11:25 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Ok, back to Getting to know you way around the...

Ok, back to Getting to know you way around the radio

Please excuse the crude photo I am attaching.
As you can see I have divided the radio into 4 main groups. Remember, some sections do over lap...
Forum: How CB radio works 01-19-2011, 11:24 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Thanks Klondike Mike. In the next few post I...

Thanks Klondike Mike.

In the next few post I want to start with a new subject. Getting to know you way around the radio. I will take a pic of the inside of a Cobra 29 and break it down into 4...
Forum: How CB radio works 01-19-2011, 11:24 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
The Dead Receiver Over the years I have had...

The Dead Receiver

Over the years I have had several techs call me trying to figure out a simple problem. They tell me the radio transmits fine. Has full power and audio out. But the receiver is dead...
Forum: How CB radio works 01-19-2011, 11:23 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
And Greetings to you Handy Andy. I am honored...

And Greetings to you Handy Andy. I am honored that you chimed in. And please do so when ever you can.

I agree on what you said there. Equipment is very expensive. And when on a budget, make the...
Forum: How CB radio works 01-19-2011, 11:23 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
On the bench at this moment is a Uniden PC 66XL....

On the bench at this moment is a Uniden PC 66XL. This is the same radio as the Cobra 25. I still use the basic 29 schematic theme when checking these radios.

This radio has the no TX or RX problem....
Forum: How CB radio works 01-19-2011, 11:22 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Cool, Well we will get started with the basic...

Cool, Well we will get started with the basic stuff this week.

Some things are easy to fix. Say the radio transmits power but there is no modulation from the rig. You would start with the simple...
Forum: How CB radio works 01-19-2011, 11:21 AM
Replies: 16
Views: 49,664
Posted By Radio Tech
Understanding how CB radio works

This is carried over from this thread.

http://www.cbtricks.com/forum/index.php?topic=7692.0

If any are interested I like to start a thread on understanding how CB radios work. I have picked up some...
Forum: Home Brew And Tech Forum 11-13-2010, 10:14 AM
Replies: 0
Views: 15,382
Posted By Radio Tech
Simple transistor tester

Here is a simple circuit for testing NPN transistors
Forum: How CB radio works 10-30-2010, 04:23 PM
Replies: 4
Views: 8,128
Posted By Radio Tech
Setting up a shop

Setting up a shop
Forum: How CB radio works 10-19-2010, 06:48 PM
Replies: 4
Views: 8,128
Posted By Radio Tech
The 4 main sections of the radio

The 4 main sections of the radio
Forum: How CB radio works 10-17-2010, 02:29 PM
Replies: 4
Views: 8,128
Posted By Radio Tech
Cobra Radio Stuff

I will post a series of stuff on how CB works. I will be using the cobra 29 as the model. This thread will be a sticky and locked. All questions and comments Will be in another thread.
Forum: RADIO MODS 06-11-2009, 09:31 PM
Replies: 0
Views: 5,243
Posted By Radio Tech
Convert cb to different freq

This one works in the Cobra 29
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