Technical Notes--Designs and Experiments.
Updated on 26Mar12  

Click here or on the graphic to move down to the Spectrum Analyzer related material.   Click here or on the photo to see info on the VHF filter.

The following notes are not always in chronological order. Also, some of the PDF documents are being shifted to HTML files, which makes them more easily viewed with a mobile platform.

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A number of files have been deleted, for they are out of date or have not been of general interest.   The files are pulled to keep the "bandwidth" at a reasonable level on this web site.    Sorry for any inconvenience that this may generate.      (2Sept10, 24March11, 2Apr11, 27Jan12)       

Click on the subject lines below to see the related file.

5 Dec 11              Almost Synthesis:  An Offset PLL with a Reference Divider. (pdf)
Almost -design program  (download) (zip)
2 Jan 11               The Two Faces of Q (html)
13Apr10              Comparing Quartz Crystal Measurement Methods (html)
26June09             A Termination Insensitive Amplifier for Bidirectional Transceivers (with k3nhi) (html)
19June09             Transistor Models and the Feedback Amplifier. (html)
24Feb09               Experiments with a Simple Low Pass Filter (html)
18 Nov 10            Mixed Form LC Bandpass Filter (html)
1Dec 10               Simple LC Bandpass Filters using Air Core Coils (html)
1Dec 10               Transformer Coupled LC Bandpass Filters (html)
2Dec07                 Printed Circuit Board Info and Errata for the Hybrid Cascode AGC/IF Amplifier
(from QST, December, 2007)  
16Nov07              An Oscillator Scheme for Quartz Crystal Characterization
25Aug07               More on the EMRFD "First Transmitter" from Chapter 1.
Dec, 2005             Problems with DOS programs running in XP and a solution.
May, 2007            A JFET Tutorial
July, 2006              Gamma, Return Loss, and VSWR
June, 2008            A Simple Method for Shrinking Picture (and other file) Size for EMail and Web Use
April, 2007           Scattering Parameter Extraction in SPICE
Jan, 2007             Mountaineer Transceivers, Old and New
Jan, 2007             Notes on the Mark-II Universal QRP Transmitter (html)
Dec, 2007            The dB versus the dBm   (Updated)              
March, 2007         Breadboarding:  The Good, the Bad, and the Ugly
June, 2005            Wireless Pioneers, W1DX and W1FB
April, 2003            EMRFD Abstract
Jan, 2007              Designing High Order LC Bandpass Filters from EMRFD
Aug, 2007             The Incidental Double Tuned Circuit -- A Transceiver Anomaly.
Sept, 2007             A 50 MHz Low Noise Amplifier with a SMT Dual Gate MOSFET
April 2011              /7 -- Portable amateur radio (html)
June, 2007              Power Meter Updates (regarding June 2001 QST paper with W7PUA)
March 2012            Zero Power Receiver related items.

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         Spectrum Analyzer Information  
The following items relate to the QST Spectrum Analyzer (Aug and Sept, 1998) that K7TAU and I described.    
Early Spectrum Analyzer Update (June 2000)   Includes data on crystal filters
Schematic for 2 dB/div mod
Recent Spectrum Analyzer Updates (Nov08)(26Apr11)
RCA Plugs and Sockets (Dec 02, Aug 06)
Mixed Form LC Bandpass Filter (18 Nov 10)
The following discussion includes info on a new tracking generator design by K3NHI and K5IRK.  
Tracking Generator Modifications (Jan 07, 2 April 10, 27feb12)
SA-TG Update 13May9.pdf (13May09)