[minima] Re: A (temporary) solution to my mixer problems
- From: Dan Reynolds <on30ng@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Wed, 22 Oct 2014 12:46:20 -0500
Wayne, for us dummies can you show us what the pad looks like - schematic.
Just need a brain check.
73
Dan -- KB9JLO
https://sites.google.com/site/on30ng/
On Wed, Oct 22, 2014 at 12:05 PM, Wayne McFee <nb6m@xxxxxxx> wrote:
> Thomas,
>
> I'm into a second build of the Minima and am using an ADE-1 as the first
> mixer as well.
>
> Since the Si570 output is some +13 dBm, and the ADE-1 needs only +7dBm LO
> drive, I placed a 50 Ohm resistive pad in line to reduce it down to that
> level.
>
> If you haven't yet done that, you should as that will help reduce spurious
> responses from the mixer and should reduce LO leakage on transmit as well.
>
> I have just the receive portion built so far, so cannot yet give you ye
> figures from mine.
>
> 73,
>
> Wayne NB6M
>
>
> > On Oct 21, 2014, at 9:42 PM, Thomas Sarlandie <thomas@xxxxxxxxxxxxx>
> wrote:
> >
> > Gang,
> >
> > After looking at the RF386 this afternoon I came to the conclusion that
> my only problem was my Minima. With -30 dBm on the output my signal was
> just too low, even for the RF386.
> >
> > I looked into the recent discussions about mixers and wanted to build
> one of them but I do not have the IC you discussed and I could not find a
> clear call on which one of the JFET mixers was the best.
> >
> > So I took a step back and realized that (to me) this project is more
> about building a working radio than running lots of mixers experiment. I
> completely removed the KISS mixer from my Minima and replaced it with one
> of the ADE-1 mixer that I had ordered a few months ago.
> >
> > My output is now at -15dBm @14.250 and -26@34.25.
> >
> > <dsa 201410211956.png>
> >
> > I should now have plenty enough power to drive the RF386!
> >
> > I think we should recommend this solution to new builders who are just
> getting started, at least until we have a good mixer that can easily and
> repeatability be built with good performance.
> >
> > I paid $15 for 4 of them on eBay. $3.5 a piece.
> >
> > Thoughts?
> >
> > 73,
> > thomas
>
>
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