Skip to main content

Spectrum Analyzer

I've decided to move Spectrum Analyzer information here to keep it mostly out of the blog posts. I've finally got almost all the parts I need, so I'll be able to start writing build pages. I'm excited, are you!? :) Anyway, stay tuned to this place for more information….

I've started building and testing boards in earnest, and I've started a list of boards that I've finished below. Also, I've been updating the graphic from a previous post to improve readability and reflect not only boards that are "complete" but complete and tested. Almost all the modules of the analyzer have been built, but they haven't been integrated or tested. On the graphic below, I've highlighted the modules that are integrated and tested in green.

[caption id="attachment_958" align="aligncenter" width="535"]![](http://alternet.us.com/wp-content/uploads/2010/04/Master- layout2.jpg) Analyzer Master Layout[/caption]

The graphic above not only functions as a scoreboard, of sorts, for the status of my analyzer, It's also the physical layout of the modules. I've included space for some optional modules that I don't have yet. These include the PDM, Mixer 4, and both the filter and 1G-2G mode switches. I figured that if I plan for them now, I won't be disappointed later. The boxes in yellow are those that I'll use removable SMA connectors on, while the white ones will be direct-soldered coax. The number in the boxes are the port number on each module. I've omitted the control board from this diagram because it will be installed on the rear panel, and this frame will be installed near the front panel. Also left out of this diagram is the cavity filter. The filter needs to be made of copper pipe and sheet brass. It's large at 4″x4″x1″, so I'll have to buy an enclosure with adequate internal space. Another decision that I'll have to make is whether I want to include a power transformer (taking A/C from the wall) inside the case.


Mounting Frame

[caption id="attachment_808" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/04/SA-5.jpg) Master Oscillator mounted[/caption]

Coaxial wiring

[caption id="attachment_872" align="aligncenter" width="540"]![](http://alternet.us.com/wp-content/uploads/2010/04/coax- title-3.jpg) Coaxial wiring[/caption]

Digital Wiring

[caption id="attachment_1187" align="aligncenter" width="540"]![](http://alternet.us.com/wp-content/uploads/2011/03/digital- wiring-8.jpg) Completed module harness[/caption]

Master Oscillator

[caption id="attachment_755" align="aligncenter" width="540"]![Master Oscillator Board](http://alternet.us.com/wp- content/uploads/2010/04/MOB-1-2.jpg) Finished Master Oscillator[/caption]

Control Board

[caption id="attachment_783" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/04/CB-1.jpg) Finished control board[/caption]

Analog Digital Converter

[caption id="attachment_853" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/04/ADC-1-5.jpg) Completed analog digital converter[/caption]

Log detector

[caption id="attachment_894" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/05/ld-1.jpg) (almost) complete Log Detector[/caption]

I.F. Amplifier

[caption id="attachment_713" align="aligncenter" width="540"]![](http://alternet.us.com/wp-content/uploads/2010/03/IF- Amp-3.jpg) Completed IF Amplifier[/caption]

DDS 1 & 3

[caption id="attachment_927" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/05/DDS-5.jpg) Completed DDS module[/caption]

PLOs

[caption id="attachment_949" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/05/PLO-8.jpg) (almost) complete PLO 1[/caption]

[Cavity Filter](http://alternet.us.com/?page_id=989 "Cavity filter

construction")

[caption id="attachment_1013" align="aligncenter" width="540"]![](http://alternet.us.com/wp- content/uploads/2010/08/cavity_filter-16.jpg) Hairpin installation[/caption]