[minima] Re: How to adjust the bias of the KISS mixer in the Minima - Video
- From: Thomas Sarlandie <thomas@xxxxxxxxxxxxx>
- To: "minima@xxxxxxxxxxxxx" <minima@xxxxxxxxxxxxx>
- Date: Sat, 29 Mar 2014 20:35:12 -0700
Mvs Sarma / Joe: I just tried driving it with a square wave but it makes
very little difference, maybe 1dB less on the LO leaked and on the mixing
product. Nothing amazing.
Joe: I can try your self-biasing setup. Could you refresh my memory on this
one?
Joshua: I don't explain the asymetry either but I see it on both my mixer.
I will keep scratching my head a bit on this one.
I will also do some research on compression point measurement and IMD3
measurement. I have a vague understanding of the theory but it will be fun
to actually try to get the measurement.
73!
On Fri, Mar 28, 2014 at 5:48 AM, Joshua Blanton <jtblanton@xxxxxxxxx> wrote:
> Hi Joe,
>
> I do not currently have an (easily usable) IMD3 test setup, which is why I
> measured P1dB. I will look at what I need to re-jigger to test IMD3 when I
> find some more bench time.
>
> Thanks,
> Josh, KB8NYP
>
> Sent from my phone - please excuse my brevity.
>
> On Mar 27, 2014 12:04 PM, "Joe Rocci" <joe@xxxxxxxxxx> wrote:
> >
> > Hi Josh
> >
> > I'm interested in both the P1dB and IMD3. My rule-of-thumb for diode
> ring DBM's is that IMD3 is about 15 db above P1dB. I wanted to find out if
> the JFET mixer behaves the same. Intuitively, I'd expect the JFET's
> non-linearity to be 'softer' than a diode's, so maybe the IMD3 is even
> better.
>
>
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