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Measuring harmonic products with a Spectrum Analyzer (SA) requires understanding of the artifacts created by the SA. One of the well known artifacts is intermodulation distortion create by the

I did some further measurements comparing a IAM81008 with a ADE-11X passive mixer in a typical SA setup Configuration was: IAM81008 -> 434MHZ filter-> AD831->10.7MHz filter->log detector and

I'd appreciate it if when people mention these somewhat esoteric devices, they provide a USA source, preferably a Tier 1 disti. I poked around a bit for the '81008 but could only find ebay vendors in

Christian, Excellent? overview "H mode" mixers, thanks! I am considering the ADL5801, seems to be a good active mixer, a bit more noise compared to a passive mixer. The main reason I am looking to an

Erik: ? In my experience, the IAM-81008 is a fine active mixer, but it is a poor choice for an SA's 1st mixer, instead I would use an IAM-82028. Of course, there are much better active mixers than

Eric,? I prefer building my equipment with dead bug style, even when working with SMT components. The schematic, photos and some notes are enough.? Christian W.? HK4QWC

YES

Hi all, anything that can inspire others to do builds is great in my opinion. Even though I have a boat anchor VNA I might build something similar but simplified to get a portable antenna analyzer.

Many of us got into Ham Radio to facilitate experimentation and innovation with electronic circuits. Though it would be nice to have a ready circuit board for sharing a design, it is not an absolute

In some cases it seems that having a pre-built PCB is restrictive because it limits the number and type of modifications (upgrades) that can be performed. Arv K7HKL _._

I am game for either construction method. The VNA sounds like a great project. Al, N8WQ

I'm making progress with a 400kHz till 1.2GHz VNA design using a SI5351 breakout board and less then 10$ of other components but building will required the usage of SMT components otherwise the upper

While improving the SA I'm building I learned something about tuning a cavity filter. The VNA I'm using is home build and consists of only? - 2 x ADF4351 - a resistive bridge - 2 x IAM-81008 mixers

The IAM-81008 is a bit better than the good old SA612 and it also goes much higher in frequency After some measurements a simple comparison AD831: Usable dynamic range (from noise output level till

I found this wonderful spreadsheet to do the calculation (See attachment) It really helps to understand alternatives for certain stages (like mixers) and where to put your amplifiers Example output

The pc software is visual c++ using .net objects. The graphing is using the standard .net chart object. Much faster then drawing the chart with lines yourselves and much more funtionality. Of course

It may be worthwhile to use a 6dB attenuator between mixer LO port and low pass filter. That way, the LO port always sees 50 ohms. It requires 6dB more LO signal, but gives 12dB more isolation.? All

On paper this seems to be usable as 2nd mixer in high IF system, IP3 only 3dB but 8dB gain, usable from DC to beyond 2GHz, NF=17dB Guess not good enough for 1st mixer Any experience?

The PJRC stuff is pretty good: ? ??https://www.pjrc.com/teensy/techspecs.html The ATMega328P normally runs on 5v in Arduinoland, but is also rated for 12mhz max when run from 3.3v, this thread says

Due and Zero are clearly dead as a Dodo, any other 3.3Volt arduino compatibles?