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Hi all,

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Today I decided I've listened to this high pitch whine on the 20 meter through 10 meter band long enough. Through a process of elimination I determined that the RTC module is causing the offensive noise in the background. With it unplugged everything is nice and quiet. My questions are, do I even need a RTC if I don't do digital stuff, does anyone know of a fix for this to quiet it down? BTW, I tried the exact same module out of my V2 board and it sounds the same with it plugged in, so It's not a defective module. Is anyone having this high pitched whine? Maybe some bypassing of the module is in order?

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Joel

N6ALT

Hi David,

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Yes I have tried filtering the high pitch whine out with caps on the 5 volt supply, they have had no effect at all. I believe the noise is from the I2C buss, because with the RTC unplugged in I can still hear the same noise only very lightly, (still a vast improvement). As far as I know there is no way to filter the I2C buss without affecting it's performance. If anyone has any ideas on how this can be cleaned up, I would love to hear it, meanwhile I will run without the RTC.

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Joel

N6ALT

Joel,

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any way to remove rtc module and run shielded cable from it to the sbitx? Im just guessing since i dont own one yet. tons of ubitxes but no sbitx. seems like you could shield it with a copper board box and use mini coax on the outputs inside the sbitx

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good luck on the repair.

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73

David

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