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So I was playing with getting some of the display noise out of the receiver today.? I used metal standoffs to ground the lower board to the backplane, then an extension cable to the display, next I was power the display with a separate power supply.? Lead popped off and landed on the pi zero. Display would no longer update.

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Hooked up HDMI and it threw a bunch of coms errors, no receive, and the pi is getting hot.

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I figure the Pi is done. And maybe anything hooked to the I2C buss.? Thought I would order the rtc and si5351m shown in the schematic too. But mine has a ms5351m instead, which is normally in the zbitx???

The Si5351 and ms5351 are pin compatible devices. ?Has Summers of QRP-Labs has tested the ms5351 part and found it to exceed the Si5351 device. ?Either device can be used.?

73

Evan

AC9Tu

Thanks, the ms part is a bit harder to source in the US. I'll wait and see if my moment of stupidity blew it up?

Why is the header from the Pi not in the schematics?? Really need to know what is on what pin.? I see the sbitx schematic, but that doesn't match up either.?

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On Mon, May 26, 2025 at 06:17 PM, Cory Lytle KO4SWI wrote:

Thanks, the ms part is a bit harder to source in the US.

stocks the MS5351M

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https://kitsandparts.com/store2.php

Thanks for the link.?

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Being the spur issue in another thread I'm trying to avoid using the SI53511A as I've read that the MS5351M is a slightly better part in some ways?

The spur is not from the Si5311, its from trying to drive the TX chain hard enough to get

power on the upper bands.?

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The MS5351 will not help that.??

As they say suit yourself.

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--

Allison
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Please use the forum, offline and private will go to bit bucket.