Re: 49er problems
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Hi Bobbie: It really is surprising how well the rig works, given its cost. I did manage to smoke a final transistor during a "key down" test, but I was running 13.8V from my large xcvr supply. I made a small heat sink from a piece of a Coke can and "wrapped" it around the transistor top and re-ran the test. Ugly, but no smoke. I would suggest to most not to exceed the 12V supply limit. Have fun! 73, Jack, W8TEE From: "bob4john@... [SoftwareControlledHamRadio]" To: SoftwareControlledHamRadio@... Sent: Thursday, August 11, 2016 1:20 AM Subject: Re: [SoftwareControlledHamRadio] 49er problems Thanks Jack I replaced the nano and DDS boards from the working unit to the non-working unit, and still does not work.. I checked the transistors with an on-board transistor tester and it shows two diodes in series.. ?seems that may be the problem... ?I have checked the board with a magnifier and it looks good along with the solder.? I checked each component with my tester before soldering on the board and each tested correctly. I will replace the transistors and see if that's that problem. But I cannot imagine why they would be bad.. I have tested the buck regulator and it seems to be stable with a little noise on the output, but the other board does the same... Thanks for the help and a great project... seems that I managed to get one that's a problem.. BTW: the working unit is great. I began with a 49er that worked fine but the audio was a little low.. ? the VFO kit and new 49er kit is super.. ?The receiver is very good for such a small unit and the transmit output is about 3 watts running on a 12 volt battery. bobbie kd4lv
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