Hi Leonard Yes had about 800mv Q20 and retuned and it started working again full output!!! Thanks Ron PS. audio xmt great also
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--- In BITX20@..., "Leonard" <dredger@...> wrote:
At the junction of Q20-R83 you ought to have at least 800mv's pk-pk with 50mv's audio into the mike jack. If you have that, the problem will be in the PA. You shouldn't have to turn R83 up more than about 3/4th to get 12 watts out. If you have the 800mv's, I'd go back and redo the pa bais adjustments.
Leonard
--- In BITX20@..., "ronbaechle" <ronbaechle@> wrote:
Leonard what happened rig was working fine and then R83 pot wouldn't adj high enough. I did check all the transistor voltages.The last scope picture of Q20 I will check,but any idea what level out of Q3 and Q18 and Q19. I haven't looked at what is the purpose of Q3.Maybe you can tell me without me searching. Thanks Ron
--- In BITX20@..., "Leonard" <dredger@> wrote:
The waveforms should get you to a stage that isn't working. Or it lets you say the stage is good if you have the waveforms. A good physical inspection and transistor voltage checks should get you the rest of the way. Between the hard copy version and the transnitter troubleshooting video, you even get a fair circuit operation description. The pair go very well together as the video uses the hard copy and gives some extra info.
Leonard
--- In BITX20@..., "ronbaechle" <ronbaechle@> wrote:
Thanks Leonard I remember watching the Videos but I didn't remember seeing the pictures of the xmit waveforms.I borrowed a scope and im looking at my Bitx20a. Thanks for the direct link. Ron
--- In BITX20@..., "ronbaechle" <ronbaechle@> wrote:
Does anyone have recorded scope levels of xmit sections on the Hendricks Bitx 20a or know of a file? Thanks Ron
