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Re: spur & harmonics fix, v2

 

I am a little wary of axial inductors. I would have easily recommended air wound coils. However, given all the RF floating around, i would recommend a toroid.

The 470 ohms to 220 ohms is jacking up the gain by a few notches to drown out the 12 mhz spur. Remember that the 12? mhz spur is not from the IF amp or the mixer, but from the Si5351's internal cross talk

On Mon, 12 Nov 2018, 17:12 G1KQH via Groups.Io <g1kqh=[email protected] wrote:
Ok to use axial inductors the ones that look like resistors instead of winding bulky toroids?

Their size would be more convenient when modifying existing UBITX PCBs..



73 Steve

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