8 ohm dummyload

[kaos513]

Any idea where to buy or how to make a 8ohm dummy load ? thanks

 

[Robb]

Six 47 ohm resistors in parallel.
The radio's speaker is either a 4 ohm or an 8 ohm; so be aware.

 

[Klondike Mike]

Or one of these;

https://www.ebay.ca/itm/Chassis-Mou...e=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649

 

[kaos513]

Six 47 ohm resistors in parallel.
The radio's speaker is either a 4 ohm or an 8 ohm; so be aware.

Its for my cobra 29ltd alignment procedure calls for 8ohm dummy load

 

[Onelasttime]

All over ebay. You need a 8 ohm load when testing a lot of audio amps. So just look for audio or stero amp dummy load.

https://www.parts-express.com/8-ohm-100w-non-inductive-dummy-load-resistor--019-020

https://www.ebay.com/itm/1000W-2-4-...hash=item1a2415b534:m:m4OqzC9ficZ3OQncCRlqFcw

I doubt you want a reactive load simulator. http://www.aikenamps.com/index.php/dummy-loads

Hope this get's you started. I know you are working on a radio but when I buy something I like to think ahead so I can get all my moneys worth out a piece of gear.

 

[Tallman]

All over ebay. You need a 8 ohm load when testing a lot of audio amps. So just look for audio or stero amp dummy load.

https://www.parts-express.com/8-ohm-100w-non-inductive-dummy-load-resistor--019-020.

You only need a eight ohm, ten to twenty watt NON-INDUCTIVE resistor. The inductive resistors will affect your readings. That is normally done for the receive alignment.
With a set RF voltage and frequency going in you need to have a certain amount of audio watts output and you peak or dip the watts as the test procedures direct.

 

[kaos513]

Does anyone know how to make a 8ohm dummy load?

 

[kaos513]

Six 47 ohm resistors in parallel.
The radio's speaker is either a 4 ohm or an 8 ohm; so be aware.

does it equal to 8 ohms

 

[Robb]

does it equal to 8 ohms

7.82 ohms - which is more than enough to be accurate for testing purposes.
Thanks for asking.

 

[Beetle]

At audio frequencies the reactance of a wire-wound resistor is completely negligible. It might be measureable, but nothing to worry about.

 

[kaos513]

Six 47 ohm resistors in parallel.
The radio's speaker is either a 4 ohm or an 8 ohm; so be aware.

I made the dummy load works well thank you.

 

[543_Dallas]

I wonder how inductive the coil of wire in the speaker is or the random length of speaker wire. CB shops will be selling scope tuned jumpers for your external speakers now.

 

[Onelasttime]

I wonder how inductive the coil of wire in the speaker is or the random length of speaker wire. CB shops will be selling scope tuned jumpers for your external speakers now.

You should see the crazy stuff they sell to audiophiles as speaker wire! Not the stuff we used as kids or teenagers that is for sure! You could jump-start a diesel with some of this stuff! LOL

 

[Onelasttime]

You should see the crazy stuff they sell to audiophiles as speaker wire! Not the stuff we used as kids or teenagers that is for sure! You could jump-start a diesel with some of this stuff! LOL

I have some pretty intense speakers from the 1970's through the early 1990's and all manner of tube and solid state discrete amps and I do not use anything too exotic! LOL

 

[Beetle]

I wonder how inductive the coil of wire in the speaker is or the random length of speaker wire. CB shops will be selling scope tuned jumpers for your external speakers now.

The voice coil of a speaker is inductive enough to have its rated impedance at audio frequencies (usually around 1KHz.) 8Ω speaker; 8Ω impedance. You can calculate the inductance (in Henries) from the inductive reactance.