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Author Topic: Low output on SSB with Drake TR-4C  (Read 16798 times)
AC5UP
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Posts: 4546




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« Reply #15 on: October 29, 2014, 07:19:45 PM »

I doubt that you will find 5v to run it on that rig!

...although it might be possible to liberate a little AC from the filament lines, rectify same and use an LM7805 or similar for a Q&D regulated 5 volt supply.  An electret mic isn't fussy about the supply voltage but I like the idea of the three pin regulator as they can shut down gracefully if necessary.
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KE7YD
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Posts: 100




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« Reply #16 on: October 29, 2014, 10:09:46 PM »

Use a quicky little resistor and cap circuit to run the condenser mic and use a 9volt lithium battery and it will run for ever before you have to change the battery.
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W9NET
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Posts: 10




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« Reply #17 on: November 03, 2014, 01:18:37 PM »

Sometimes the SSB filters shift in frequency and don't allow enough signal to get through.  Do u have the manual?  The power output should be the same on both sidebands, and the sound of the noise in the receiver should sound roughly the same for both upper and lower sidebands.  Is the power output the same on both sidebands?  A simple adjustment of the filter center frequency per the manual might get you on track.  Wonder is you are transmitting any carrier when you key the mike without talking?  If enough, it could show up on your output indicators (pwr meter, plate current meter).  Maybe the carrier balance needs to be nulled.
--W9NET
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KE0BKQ
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Posts: 9




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« Reply #18 on: November 15, 2014, 05:57:30 PM »

Whoo hoo!  I just made my first contact with the radio this evening during the ARRL Sweepstakes. All it took was 1) replacing the mic pre amp tube, and 2) getting the "mic" audio to the right level for the radios high impedance input. St. Louis to New Mexico at about 90 watts. There wasn't time to really get into audio quality though, unfortunately.
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