TXU1256 50/100Hz Noise

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DM4KCS
Berichten: 1
Lid geworden op: 17 jun 2014, 13:44
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TXU1256 50/100Hz Noise

#1 Bericht door DM4KCS »

Hello dear radioamateurs,

i got a problem with my txu1256 transmit unit.
There is a ripple noise with 50/100Hz on my tx-audio.
At the output of LIT1256 is all ok but at the output of varactor modulator FGN1256 ( 68MHz) there is 50Hz noise.
Does anyone have an idea ?

VY73 de Chris

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on7wp
Berichten: 209
Lid geworden op: 01 dec 2007, 12:40

Re: TXU1256 50/100Hz Noise

#2 Bericht door on7wp »

very simple.

replace all elco's in the power supply module, they are old and dried out.

You can even use higher values in the same size, prefarbly the black high temperature ones from Farnell


Pedro ON7WP

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