OK no RF out... :-(
Done a bit of probing. Going to do some operating using another rig for a bit then will come back to this.
Supply is 10 1.2V NiMH batteries and supply is 11.29V.
At Junction of R12/C14 have nice clean 230mA 7.03070 MHz signal (after turned C26 a bit).
Just to make sure that on key down I get a voltage to PA... R23/R26 11.15V on key down so the keying voltage is appearing.
Junction of C43/T1 11.05V and drops to 0V on key down
Junction of Q3/C31/T1 11.05V drops to 0V on key down
Q5 and Q6 (BD139) collector on both 11.25V key up or key down and emitter and base both remain at 0V
U1 Pin 7 11.27V
U2 Pin 8 5.94V
U3 Pin 6 11.22V
U4 Pin 8 5.25V
Subscribe to:
Post Comments (Atom)
3 comments:
My output transistors had no markings on them and unfortunately I mounted one of them backwards. Fortunately, when I put it in the correct way, all was right with the world :).
You should see the 7.0307 signal on the transformer primary when you key.
Tom, ak2b
Pig Rig #-1
My output transistors had no markings on them and unfortunately I mounted one of them backwards. Fortunately, when I put it in the correct way, all was right with the world :).
You should see the 7.0307 signal on the transformer primary when you key.
Tom, ak2b
Pig Rig #-1
Tom,
My Q5/Q6 are marked and I removed both, put them on an analyser and checked the hfe, pin id ecb etc... seems fine.
Diz has suggested a few things so going to try this morning.
72
Dom
FP#2233
Post a Comment