Calling all B&K 2040 Owners - Can you help?

[dodgeyvanner]

Hi all
Just purchased a B&K 2040 and note in the instruction it shows you need an "audio load" as circled below in the srtup shown in the manual.

Are these readily available units or can you make them, if you can make them anyone got any details on what is required?

Thanks

Mark

 

[groundwire]

Its just an audio dummy load. Its just a resistor either 4 ohm or 8 ohm and rated at a certain power. The cheapest way to go if thats what you want is go to ebay and look up audio dummy load, you will see listings for a big green resistor rated for 100w at 4 ohms, or they have 8 ohms too. Cb external speaker i think is 8. They are super cheap

 

[Tallman]

You will have to build that one for yourself. Be sure to use non-inductive resistors.

Notice it is an observation point looking for flat topping and other distortions.

 

[dodgeyvanner]

Hi tallman and groundwire
Thankyou for the information, very much appreciated, could i call on your expertise a little further please.
If i were to put the resistor in a small project box, obviously i have s terminal either side of resistor, for the scope bnc connection would it just simply connect either side of resistor?
Thanks again
Mark

 

[groundwire]

For the most part yes,. The voltage should be low enough as not to overload the scope. You could also inductively couple the conector to the resistor to get a lower signal level, but a direct connection should be fine.

 

[dodgeyvanner]

Thanks groundwire, i will look to get some parts and get building!

Many thanks to everyone for their help!

 

[Robalo]

Playing around and learning how to adjust RX on 23 channel CB Cobra 21, you'll need to make sure you have a steady needle on the multimeter. To do that you'll need the RF level and the volume of the radio. I don't have 8 ohms dummy load, if someone knows the schematic with some BNC connector please share it so I can make my own box to connect it with my OSC. 73's QRZ Robalo

 

[Robalo]

dodgeyvanner does the video help you up ?