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Post by vanlifeson on Jan 21, 2022 12:57:16 GMT -5
Can anyone tell me what the heck a neon bulb audio mod is on a browning golden eagle? Someone on eBay is selling one with a neon bulb audio mod. What the heck is that? They claim it’s a limited edition from browning.
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Post by KneeBiter on Jan 21, 2022 21:09:58 GMT -5
It's the special limited edition one only yellow table screw you mod. Don't believe anything that dude writes or says.
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Post by 2600 on Jan 21, 2022 23:09:53 GMT -5
This particular mod will please a wattmeter, making it swing better with voice modulation.
But it won't please the ear of anyone listening to that transmitter. Introduces distortion.
73
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Post by vanlifeson on Jan 22, 2022 19:06:34 GMT -5
This particular mod will please a wattmeter, making it swing better with voice modulation. But it won't please the ear of anyone listening to that transmitter. Introduces distortion. 73 What is that mod doing? Replacing a resistor? LoL |
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Post by 2600 on Jan 22, 2022 23:20:58 GMT -5
It causes a sudden increase in the final tube's screen-grid current when voice peaks reach the bulb's threshold voltage. The bulb does nothing until the peak audio voltage gets above 90 Volts or so. The gas in the bulb will ionize, and cause the tube's screen-grid voltage to jump upwards. This boosts the tube's power gain in step, making an average-reading wattmeter swing upwards more vigorously as you speak.
This does unfriendly things to your voice waveform, and the distortion products it will add to your voice just don't sound all that good.
73
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Sandbagger
Administrator/The Boss 
Posts: 6,250 
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Post by Sandbagger on Jan 23, 2022 15:59:43 GMT -5
It causes a sudden increase in the final tube's screen-grid current when voice peaks reach the bulb's threshold voltage. The bulb does nothing until the peak audio voltage gets above 90 Volts or so. The gas in the bulb will ionize, and cause the tube's screen-grid voltage to jump upwards. This boosts the tube's power gain in step, making an average-reading wattmeter swing upwards more vigorously as you speak. This does unfriendly things to your voice waveform, and the distortion products it will add to your voice just don't sound all that good. 73 The CB radio book of tricks is full of questionable audio mods that do more to satisfy that inexplicable urge to see wattmeters swing further, than to improve the intelligibility and quality of the audio itself. When properly done, asymmetrical modulation can improve loudness while retaining quality. But these quick and dirty mods aren't able to achieve the level of quality that should be desired. |
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