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| Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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4th Aug 2016, 11:36 pm
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#1 |
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Octode
Join Date: Jun 2013
Location: Huddersfield, West Yorkshire, UK.
Posts: 1,795
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Dual Tone generator for SSB
Hi Peeps... Thought you might be interested in this little box..a Two tone sine wave generator for setting up SSB exciters and PA's. I cannot claim originality for the schematic, as it was on the net.. but it has been modified. The box was scratch built from 2.5mm Styrene sheet.
To ensure a reasonably linear sinewave the lower base bias resistor is trimmed with a parallel resistor, depending on the gain of the device. A series resistor is also placed in the VR top leg to equalize the outputs at max rotation.
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Should get out more. Regards Wendy G8BZY |
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5th Aug 2016, 8:17 am
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#2 |
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Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Dual Tone generator for SSB
Do let us know what your third order IMD is like from the finished TX.
(Many boring hours spent chasing better than 35dB down on the individual tones on solid state "linear" amps in the early '80s)
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
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5th Aug 2016, 10:37 am
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#3 |
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Octode
Join Date: Jun 2013
Location: Huddersfield, West Yorkshire, UK.
Posts: 1,795
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Re: Dual Tone generator for SSB
Chris.. it will be a while yet...something not quite right in the modulator/audio preamp..its seems to be losing the 1380 hz...and I know the bandpass filter is ok 300 - 3 khz.
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Should get out more. Regards Wendy G8BZY |
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