[minima] Re: 32Mhz IF frequency?
- From: allison <ajp166@xxxxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Sat, 06 Dec 2014 15:45:32 -0500
Hi,
Will not work. Simple test is to substitute a switch that is on for the
current LO phase.
You end up with both sides of the transformer with a close switch to
ground for both
phases.
The best mixer other than DBM is a quadruple switch (doubly balanced) as
all ports are isolated.
The design that Sergio Cartoceti, IK4AUY is one of the better known and
respected designs.
Having studied a long list of published works on mixers balance is the
most powerful tool we have.
A note on that is the Trask KISS with a FST switch is a good single
balanced mixer. Doing it with
JFETs can work but there is a topology by Cambell that works better.
Both have origins back to
Rohde.
Allison/Kb1GMX
On 12/06/2014 03:06 PM, Ashhar Farhan wrote:
> we could use two back to back diodes in each leg of a singly balanced
> mixer. i am attaching a proposed circuit.
>
> - f
>
> On Sun, Dec 7, 2014 at 12:49 AM, Arv Evans <arvid.evans@xxxxxxxxx
> <mailto:arvid.evans@xxxxxxxxx>> wrote:
>
> Polyakov mixer is interesting because the LO input is at half the
> operating
> frequency, thus helping to minimize LO leakage into preceding stages.
> Other than that it can be constructed in almost any standard mixer
> configuration as long as the switching happens on both halves of
> the LO
> cycle. Not sure if it is good or bad as mixers go...just
> different from what
> we usually see in ham construction.
>
> Arv
> _._
>
>
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