Looking at the pictures of the new junk

I took another gander at the items I bought yesterday:

https://wb9kzy.blogspot.com/2025/10/just-because-i-could.html

One item caught my eye:

a little blurry, will take another picture once it arrives

I've mentioned this VFO before in passing:

https://wb9kzy.blogspot.com/2022/09/ltc1799-rc-oscillator-chip.html

Here is the drift chart of the LTC1799 left out of the earlier blog post:

delta F in Hz on Y axis, time from cold start on X axis, frequency about 6.58 MHz

I also did a web search and found this posting from qrp-tech:

https://groups.io/g/qrp-tech/topic/ltc1799_oscillator_chip/6472173

Lots of hams have considered this chip and found it wanting but apparently it is used by our fellow travelers, electronic musicians:

https://www.circuitbenders.co.uk/tutorials/LTCinstallation1.html

https://www.modwiggler.com/forum/viewtopic.php?p=4069760

One thing that I hadn't considered originally is that possibly Linear Tech wanted the output to warble ? the reason: it's a technique to shmear out the spectrum of the clock, sort of a cheat code to get around the FCC regs on emission ?  

https://www.eetimes.com/spread-spectrum-clocking-to-reduce-emi-clever-or-cheat/

Maybe not - anyway I was pleased to see that kit is part of the Ebay haul and will try it out and report.   Datak - Philmore still seems to be kicking however couldn't find the LTC1799 VFO kit mentioned online. 

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm