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Author Topic: Yeasu FT-901DM mod to AF unit  (Read 3388 times)
KB9LQA
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Posts: 16




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« on: April 07, 2013, 05:16:34 PM »

Hello,
I have read about a mod to the AF unit to improve the RX audio.
It says to replace C511 with a 47nf cap. Should result in a cleaner RX audio
Anyone ever try it ? If so what were your results? And what type of cap, poly film,metalized film,ceramic disk? Thanks, for any opinions,  CHRIS......
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KE3WD
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Posts: 5689




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« Reply #1 on: April 08, 2013, 05:39:45 AM »

What type of cap is the original C511? 

Replace with same type, new value, same or better voltage rating. 


73
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KB9LQA
Member

Posts: 16




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« Reply #2 on: April 08, 2013, 04:52:07 PM »

The original is an ELKA barrel style cap. Not sure what its made of.
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W9GB
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Posts: 2624




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« Reply #3 on: April 08, 2013, 05:35:03 PM »

Quote
The original is an ELKA barrel style cap. Not sure what its made of.
IF it has markings for POLARITY (+, -), THEN it is an Electrolytic capacitor.

RADIAL style - Both Leads come out of barrel (can) end.
AXIAL style - One lead comes out of each barrel (can) end.

REPLACE with Same (Electrolytic), OBSERVE Polarity.
===
MODS?

IF they are not outlined at Fox Tango -- THEN Question author's technical knowledge.
http://foxtango.org/FT901/FT-901-902%20Web%20Page.htm

FT-901DM AF Unit, PB1705
http://foxtango.org/FT901/graphics/FT-901_AF_Unit_PB1705.jpg
« Last Edit: April 08, 2013, 05:41:08 PM by W9GB » Logged
KB9LQA
Member

Posts: 16




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« Reply #4 on: April 08, 2013, 06:20:32 PM »

Quote
The original is an ELKA barrel style cap. Not sure what its made of.
IF it has markings for POLARITY (+, -), THEN it is an Electrolytic capacitor.

RADIAL style - Both Leads come out of barrel (can) end.
AXIAL style - One lead comes out of each barrel (can) end.

REPLACE with Same (Electrolytic), OBSERVE Polarity.
===
MODS?

IF they are not outlined at Fox Tango -- THEN Question author's technical knowledge.
http://foxtango.org/FT901/FT-901-902%20Web%20Page.htm

FT-901DM AF Unit, PB1705
http://foxtango.org/FT901/graphics/FT-901_AF_Unit_PB1705.jpg

Thanks, That's where i first saw the mod, on the Fox Tango, FT-901 survival guide web page. I was curious if anyone had tryed the mod, and with what kind of results . And thanks for the info on cap type.
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