[AMPS] Amplifier Experiments!

[Jon Ogden]

>Disconnect only the TOP of the choke from the circuit. Add 
>a resistance in series with the top connection of the choke, with a 
>detector diode across that resistance, and measure the voltage drop 
>across that resistance. While somewhat crude, it's better than having 
>no idea at all of choke impedance.

So do I feed a small signal into the resistor/diode pair?  And how does 
measuring voltage drop across a resistance help me to calculate 
impedance?  If I have a known resistance and a known voltage, I can 
calculate current.  So perhaps I am dull, but I need a more detailed 
explanation here.
>
>A more crude method is just to use a small 12 volt wire lead lamp and 
>a T connector. Run one end of the T connector to your dummy load and 
>the other to the rig. The other empty port goes to the lamp through a 
>short flexible lead.. 
>
>Ground the T to the chassis and sweep the choke with the rig. When 
>you get the approximate brightness for a given amount of power, you 
>can substitute a resistor and find the approximate impedance for a 
>given power and brightness.

What is approximate brightness?  What part do I connect to the choke?  If 
I get your right I get a "certain" brightness, then remove the choke and 
attach a resistor instead until I find it.  OK, but again, where do I 
attach the choke and or/resistor?

73,

Jon
KE9NA



--------------------------------------------------------------------------
Jon Ogden

jono@webspun.com
www.qsl.net/ke9na

"A life lived in fear is a life half lived."


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm