With Yahoo Groups shutting down, and not all of those I subscribe to moving over to groups .io. I wanted to grab a copy of the existing Yahoo Group data. I found directions on how to grab a download o

I have had good luck with a RF power reference I built based on the one at W1GHZ.ORG. That and a step attenuator has been adequate for calibration of the AD8307 for general amateur radio use. Of cours

Here is another 1 port VNA you might be interested in https://bitbucket.org/kuchura/eu1ky_aa_v3/wiki/Home DuWayne KV4QB

I am working on a version based on the one at http://ra4nal.qrz.ru/vna.shtml I had several boards made from the Sprint Layout provided at that site. If you would like one let me know, and I will send

Any one have any experience with the VNArduino project ?at https://hamprojects.wordpress.com/2016/02/21/hf-arduino-vna-english-version/ DuWayne KV4QB

I have several posts on my blog about a self contained SNA-Jr that I built, similar to Tom's YANA.. They cover the very early design, and functionality I wanted to include in a small self contained un

It depends on what ESP8266 board you use. There are several with different pins brought out. There is a new development board recently released that brings all the pins out along with built in USB TTL

You could look at the Sweeperino by Asher Farhan at http://hfsignals.blogspot.in/p/sweeperino.html Basic SNA using a si570 and Ad8307 power meter with 2 line display for stand alone use. He also has a

I have modified several of the inexpensive rotary encoders by removing the detent ball. There are several Youtube videos about this. Gives a much nicer feel. Also if you have room in your project ther

Using a si5351 for the VFO in the 49er should work fine. I built a si5351 based VFO for a Frog Sounds transceiver, which is very similar to the 49er. I put provisions on the board I designed for an at

The 5351 is a square wave output, so will probably have issues with harmonics. One simple SNA using the si570 is the Sweeperino by Asher Farhan http://hfsignals.blogspot.in/p/sweeperino.html it can be

After reading recent posts in this thread it appears that there is a mix up of the capabilities of the SI5351 with the SI570/571 family of clock generators. The original SI5351 came in 3 types SI5351/

Another version of a SNA using a si570 is the Sweeperino by Ashar Farhan. Info is on his blog http://hfsignals.blogspot.in/p/sweeperino.html There are links to the Arduino sketch and a PC program for

A simple replacement of the ad9850 by a si5351 would have problems because of the square wave output of the 5351. I tried using a 5351 in a simple antenna analyzer, and found that I was getting respon

I just updated my blog post on the stand alone AD8307 power meter I built. I have provided a link to the Arduino sketch, Eagle board file. Also toner transfer image and board layout files. DuWayne's P

I built a stand alone AD8307 power meter using a Nano. Since the max full scale output of the Ad8307 is 2.5 volts, instead of using an amplifier or different voltage reference I took the sum of two re

For most of the projects I build using a Nano, I use 40 pin low profile IC sockets cut down to 30 pins. Then I install the header pins on the nano with the longest pin side down through the top. This

I bought some of these from eBay. http://www.ebay.com/itm/10-Pcs-Gold-Plated-2-54mm-Male-40-Pin-Single-Row-Straight-Round-Pin-Header-Strip-/170842982053?hash=item27c70906a5:g:~IwAAOSw-vlVkQOq But for

For most of my projects that use the Arduino Nano I use 40 pin low profile IC sockets cut down to 30 pins. On the Nano I install the regular header pins down through the top of the board. This is give

You could use the existing PHSNA and bring out A4 A5 5v and ground to an external 5351 board. Then change the existing PHSNA code to control the 5351 and use the same graphing function. I have an extr