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Post by pinetree on Dec 6, 2017 17:34:41 GMT -5
Does anyone know how to boost the deadkey output power? Tubes are good, radio is aligned, SWR is good, but all I can get is 2.5 watts deadkey. Thanks
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Post by 2600 on Dec 6, 2017 22:45:43 GMT -5
Darn the bad luck!
Troubleshooting a dead transmitter is a lot easier than one that's "weak".
Raises the question, is just one part holding it back?
Are six different parts holding it back, each one only by about 10 percent by itself?
Change just one of those six parts, and you see only a tiny improvement.
No, I don't know which six parts, just meant that as an example. When a radio gets to be fifty years old, you could see multiple "weak" components, or resistors that have changed resistance value from what's marked on them.
A tube that tests good can also be 'weak' in the radio.
Have a look at the plates on the Plate Tune control with BOTH the Load and Tune are peaked for MAXIMUM MODULATED POWER.
Yes, I meant to shout. The Load must be set with full modulation. If you set it on dead carrier alone, this will hold it back.
The MAIN THING you want to look for is the position of the plates on the Plate Tune control. If the plates are as far apart as they will go, that means the control has reached the end of its travel, and is not properly peaked.
That will hold you back. Same goes if the plates are fully meshed together 100 percent. A control that goes all the way to one extreme means that you didn't really get a "peak" from it.
73
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Post by pinetree on Dec 7, 2017 11:42:14 GMT -5
Thanks for the reply. The transmitter is a Browning S-23, so there are no plate/tune controls. My best guess is as you said, a weak or drifted resistor. I already recapped it, so there's not much else to fiddle with. Any ideas are welcome! 73
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Post by 2600 on Dec 7, 2017 15:44:10 GMT -5
The Plate Tune and Load controls are on the right side of the cabinet, just above the bottom edge.
The one towards the front is the Tune, the other one is the Load control.
73
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Post by pinetree on Dec 7, 2017 17:37:56 GMT -5
That's right, I forgot about them. Anyway, peaked them, tiny increase in output. Some component or tube is probably the culprit. I'll try swapping tubes next, thanks. Any more ideas are welcome! 73
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