Technical Notes
Updated on 26June09  

Scroll down to the end for Spectrum Analyzer Info.

The following notes are not always in chronological order.
26June09             ATermination Insensitive Amplifier for Bidirectional Transceivers (with k3nhi)
19June09             Transistor Models and the Feedback Amplifier.
24Feb09               Experiments with a Simple Low Pass Filter
9 Dec 08               Mixed Form LC Bandpass Filter
13Oct08               Simple LC Bandpass Filters using Air Core Coils
30June08              Field Day 2008
19Apr09               Transformer Coupled LC Bandpass Filters
29Jan08                Experiments with Singly Balanced Mixers
21Jan08                Oscilloscope AB Time Bases -- a Tutorial.
13Jan08                Free SMT Parts Still Available from KE6F.
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
17Oct 07              Adding a Q-Multiplier to a Zero Power Receiver
8Dec08                 Experiments with Coils and Q-Measurement
25Aug07               More on the EMRFD "First Transmitter" from Chapter 1.
May, 2007            Pads and Feedback Amplifiers
Dec, 2006             Local Oscillator Experiments
June, 2005            Field Day 05
Sept, 2007            Our Books
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
July, 2007             Portable Operations, /7
April, 2007           A Cheap Rotor System
April, 2007           Scattering Parameter Extraction in SPICE
Jan, 2007             Mountaineer Transceivers, Old and New
Jan, 2007             Notes on the Mark-II Universal QRP Transmitter
Dec, 2007            The dB versus the dBm   (Updated)              
June, 2001            Routing Coax through a Metal Wall
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
Oct, 2001             IRFD Update (An oscillator design issue.)
Aug, 2007             The Incidental Double Tuned Circuit -- A Transceiver Anomaly.
July, 2002              A High Q VHF Triple Tuned Filter
June, 2004             A Simple VHF Bandpass Filter Topology
Sept, 2007             A 50 MHz Low Noise Amplifier with a SMT Dual Gate MOSFET

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.
Recent Spectrum Analyzer Updates (Nov08)
RCA Plugs and Sockets (Dec 02, Aug 06)
Tracking Generator Modifications (Jan 07)
SA-TG Update 13May9.pdf (13May09)

Aug, 2007              An Antenna Support for Semi-Portable Applications
June, 2007              Power Meter Updates (regarding June 2001 QST paper with W7PUA)