[Elecraft] Keying Waveform Measurement

[G3VVT at aol.com]

In a message dated 09/02/05 21:17:14 GMT Standard Time,  
RStein at co.grays-harbor.wa.us writes:

What I  thought over all these years (since 1964) a 50 ohm load was  actually
a
68 ohm load after many years in oil and many heating  cycles.



----------------------
 
There was a report about this problem some years back in Radcom  and the 
answer came from no less an amateur than G5RV.
 
Apparently over a period of time some types of cooling oil in the  Heath 
Cantenna and similar types can have a chemical reaction with the carbon in  the 
dummy load even though it may have a protective coating. The ultimate  
destruction cycle was with vegetable oil where the resistor was destroyed in as  little 
as one year. Frying tonight!
 
Bob, G3VVT