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FT-102 Overshoot Fix - by Mal, NC4L




 
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Author Topic: FT-102 Overshoot Fix - by Mal, NC4L  (Read 11861 times)
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Steve - WB3HUZ
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« on: June 12, 2005, 04:48:36 PM »

No more key down overshoot!

http://www.amwindow.org/tech/htm/ft102overshoot/ft102overshoot1.htm
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KI4NR
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« Reply #1 on: April 30, 2008, 06:49:28 PM »

Although I have the ultimate respect for Mal NC4L and his overshoot mod does work. There is a simpler way to stop the overshoot without all the complication of cutting the AF board and 8 Volt regulator and you don't even have to pull a board. If you look at the wiring schematic you will know notice the mode switch segment S-1F goes to the counter board J01/P54. This segment of the mode switch is responsible for the changing mode indictor on the display. It also has a fix 8 volts powering it which is what we need for the AM modulator.

My mod is this simple. Go to the top of the counter board Connect a wire to the anode of D-06 that is connected AM-N on the counter schematic, run this wire down to the AM unit. Cut the AM TX8V wire from plug P60 Pin 1  (leaving enough to solder the new wire to the plug) and connect to your new wire from D-06 , shrink tube all connections and your done. When you go to AM the mode switch S-1F now power's the AM modulator with a fixed (AM only both TX&RX) 8 volts and the overshoot is gone. The voltage disappears in all other modes but AM ........Simple , effective and easy and no regulator needed, Just a piece of wire and a understanding of the radio.

73 john KI4NR

LPC Wireless
http://www.qsl.net/ki4nr/

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w3jn
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« Reply #2 on: July 31, 2008, 03:03:17 PM »

Link in first post broken.

New link:

http://www.amwindow.org/tech/htm/ft102overshoot/ft102overshoot1.htm
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FCC:  "The record is devoid of a demonstrated nexus between Morse code proficiency and on-the-air conduct."
Steve - WB3HUZ
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« Reply #3 on: July 31, 2008, 03:20:23 PM »

Nice! I like it.

Although I have the ultimate respect for Mal NC4L and his overshoot mod does work. There is a simpler way to stop the overshoot without all the complication of cutting the AF board and 8 Volt regulator and you don't even have to pull a board. If you look at the wiring schematic you will know notice the mode switch segment S-1F goes to the counter board J01/P54. This segment of the mode switch is responsible for the changing mode indictor on the display. It also has a fix 8 volts powering it which is what we need for the AM modulator.

My mod is this simple. Go to the top of the counter board Connect a wire to the anode of D-06 that is connected AM-N on the counter schematic, run this wire down to the AM unit. Cut the AM TX8V wire from plug P60 Pin 1  (leaving enough to solder the new wire to the plug) and connect to your new wire from D-06 , shrink tube all connections and your done. When you go to AM the mode switch S-1F now power's the AM modulator with a fixed (AM only both TX&RX) 8 volts and the overshoot is gone. The voltage disappears in all other modes but AM ........Simple , effective and easy and no regulator needed, Just a piece of wire and a understanding of the radio.

73 john KI4NR

LPC Wireless
http://www.qsl.net/ki4nr/


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w3jn
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« Reply #4 on: July 31, 2008, 07:04:26 PM »

Someone oughta have a word with the webmaster over there at the amwindow Roll Eyes
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FCC:  "The record is devoid of a demonstrated nexus between Morse code proficiency and on-the-air conduct."
Steve - WB3HUZ
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« Reply #5 on: July 31, 2008, 07:54:48 PM »

Yea, he sux.

Nice catch.

Someone oughta have a word with the webmaster over there at the amwindow Roll Eyes
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