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Very interesting, keep up the good work! I'm only on my build of the Specan, also a (re-)learning process:-) Now we need a good diy description on how to build a 2.6GHz cavity filter. (I have searched

1: The SA can scan up to 1.8ghz with 1st IF at 2.6GHz. ADF modules go up to 4.4GHz 2: Some chinese. Some own build using ERA-1 on converted chinese bias tee modules 3: Only output balun. No input or

Erik, not much advice but number of questions instead besides saying that your posts are really interesting to follow. 1. Why not lower cutoff frequency on the first LPF somewhere around 1.3GHz? 2.

Now most of the modules are in, I combined everything into the complete signal chain. The purpose of this post is to document the setup and performance of this configuration. The +10dB after the

Gentleman, With Carlos KJ6ST permission , I call your attention to an outstanding, well documented, easy to implement, measurement technique.

Encuraging for me at my 74. Let me try Thanks

Hand soldering 0603 is doable. I use regular fine tip solder iron and thin reason core solder. No additional flux. And +6 glasses

I tested the second one. The black board. It has a 25MHz reference. The green board has a 10MHz reference. I ordered also the green to test because the layout seems better and price has come down and

Which of the two ebay boards are you testing ?

The cheap chinese ADF4351 module is an attractive option as LO for a spectrum analyzer but is the performance OK? This is the scan with only a -35dBm 1MHz signal with little parmonics Terrible spurs

Looks like the breakout boards aren't too bad priced: https://www.adafruit.com/product/1162 This one looks interesting for versatility for the price:

Welcome to the group Goran. Regards Mike M Ku4qo

Greetings everyone, Just joined the group. Interested in making, homebrewing, etc. I have a small workshop space in my basement where the magic happens. Already have an old Tek 2213 (60 MHz, 2 ch)

Thanks, got it!

I added one page to the already present file

Hi Erik, is this in addition to the file you uploaded on Feb, 12? If so, I don't see it in the directory. Thanks!

I added a page describing the used measurement principle. Hope this explains why it is possible to have only minimal HW and still very good performance. Basically the performance is made possible by

Thomas: Thanks for sharing the procedure and your source code. I added both to my reference library. Christian W. HK4QWC ( https://qrz.com/db/hk4qwc )

The basic procedure is outlined here: http://hpmemoryproject.org/an/pdf/an_286-2.pdf There is no need to use that given modulation meter, the important part is to look at the change of the demodulated

After playing around with the RF chain of my SA I discovered there where too many possible combinations and I needed some proper simulation and analysis tool ADIsymRF is a free tool from Analog