[Elecraft] K3/KPA500 with a MFJ-994B AUTO TUNER

KEN SIROIS divemaster5 at bellsouth.net
Sun Oct 23 12:21:26 EDT 2011


de KF1C 

Running K3 w/ ALS-600 Mfj-994B in a plastic box at base of 43ft vertical / and 
99 ft inverted L. 

Fed against 2 above ground radials 135 ft long and 2 65 ft long. (also 5 or 6 60 
ft  buried)  
Inside the shack 100 ft of coax make not much differance on these readings, I 
spent allot of time back and forth. 

I have line isolators in line (both coax and ferrite ) so I know its not rf on 
the shield causing the trips. 

994B loses lock and trips the amp above the following readings. 
The 994B does not have a wide matching range like the 998 if you read the specs. 

I am waiting for the KAT-500 to come out. 

43 ft vertical 
994B handles 500 watts 10m 12m 15m 17m 20m 
994B handles 200 watts 30m and 40m 
994B handles    50 watts on 80m

Inverted L 99 ft 

994B handles 500 watts 10m 12m 15m 17m 20m 40m 
994B handles 75 watts 80m and 160m   

Both Inverted L and 43ft vertical connected. 

994B handles 500 watts 10m 12m 15m 17m 20m 40m 
994B handles 200 watts 80m and 160m   

I'm going to extend the L to quarter wave on 160m soon, that should (hopefully) 
allow full power on 80m 


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