Sherwood Engineering Incorporated Sherwood Engineering Incorporated

1268 South Ogden Street Denver, Colorado 80210 USA

email SEI     Phone: 303-722-2257     FAX: 303-744-8876

9 a.m. - 5 p.m. (Mountain) Monday - Friday

VISA, Mastercard, & American Express Welcome

 

-- NOTE   Closed for vacation May 22 - June 17 2015, Click Here or Scroll Down to Yellow Banner for Receiver Test Data   NOTE --



Products Available:

SE-3 MK IV

No longer in production after 30 years --

Watch eBay for used SE-3s

Drake R-4C

Synchronous Detector

Listen to the effectiveness

Interfacing a shortwave radio to SE-3

R4-C Kits & Accessories

First-IF roofing filters

Drake R-4C filters

 

Cooling Kits

Catalogues

R9000

Icom IC781

Amateur Radio

Short Wave Listener

 

Filters

Other Products

Drake, Racal, JRC, Icom, & Atlas

Collins 455 kHz mechanical & crystal

DSP protection filter replacement

IC-765 distributed roofing filter NEW

First-IF roofing filters

Japan Radios NRD models

Icom R9000 | R8500



Presentations, How To Tips, & White Papers:

How To Optimize Rig Performance

Dayton Contest University, 2014

Video (mp4)  (YouTube)  (all CTU videos)

Slide Show only (ppt or pdf)

Click to view, or to save, right click & Save Target/Link




How To Optimize Rig Performance

Albuquerque NM, 2014

Slide Show only (ppt or pdf)

Click to view, or to save, right click & Save Target/Link




* Recent Video Presentations *

How To Optimize Rig Performance, 2014

New Offerings, 2013

Transceiver Performance, What's New, 2011

Click to view, or to save, right click & Save Target/Link


Transceiver Performance

10 Years of Change

Dayton Contest University, 2012

Slide Show only (ppt or pdf)

Click to view, or to save, right click & Save Target/Link


New Offerings 2013

Since Dayton 2012

Dayton Contest University, 2013

Video (mp4)  (YouTube)  (all CTU videos)

Slide Show only (ppt or pdf)

Click to view, or to save, right click & Save Target/Link




New Offerings 2013

Since Dayton 2012

Daytime Presentation, Huntsville AL, 2013

Slide Show A (ppt or pdf)  |  Slide Show B (ppt or pdf)

Click to view, or to save, right click & Save Target/Link


Transceiver Performance &

Evolution of Lab Testing

Banquet Presentation, Huntsville AL, 2013

 Slide Show (ppt or pdf)

Click to view, or to save, right click & Save Target/Link




Transceiver Performance

10 Years of Change

Ten-Tec, Sevierville TN, 2013

 Slide Show (pdf)

Click to view, or to save, right click & Save Target/Link




New Offerings 2013

Since Dayton 2012

W4DXCC, Pigeon Forge TN, 2013

Slide Show (pdf)

Click to view, or to save, right click & Save Target/Link


Choosing a Transceiver

Far from Simple

Dayton Contest University, 2010

Slide Show only (ppt or pdf)

Click to view, or to save, right click & Save Target/Link




Receiver Performance Transmitted BW Contest Fatigue

Austin TX, 2010

PowerPoint (ppt) - Acrobat (pdf)

Click to view, or to save, right click & Save Target/Link


Transceiver Performance

What's New In the Last Year?

Dayton Contest University, 2011

Slide Show with Audio (wmv)

Slide Show only (ppt or pdf)

Click to view or listen or to save, right click & Save Target/Link




Roofing Filters, Transmitted IMD & Receiver Performance

Boulder Colorado Amateur Radio Club (BARC), 2011

Audio (mp3)

Slide Show (ppt or pdf)

Click to listen, or to save, right click & Save Target/Link


Roofing Filters, Transmitted BW & Receiver Performance

Dayton Contest University, 2008

Slide Show with Audio (wmv)

Slide Show only (ppt or pdf) - Audio only (mp3)

Click to view or listen or to save, right click & Save Target/Link




Roofing Filters, Transmitted IMD & Receiver Performance

Boulder Colorado Amateur Radio Club (BARC), 2008

PowerPoint (ppt) - Acrobat (pdf) - Audio (mp3)

Click to view or listen or to save, right click & Save Target/Link




Roofing Filters, Transmitted BW & Receiver Performance

YCCC , Boxborough, MA, 2008

PowerPoint (ppt) - Acrobat (pdf)

Click to view, or to save, right click & Save Target/Link


Ground Screen Replace/Compliment a Radial System

Dayton Contest University, 2009

Slide Show only (ppt or pdf)

Click to view, or to save, right click & Save Target/Link




Receiver Performance Transmitted BW Contest Fatigue

Boulder Colorado Amateur Radio Club (BARC), 2009

PowerPoint (ppt) - Acrobat (pdf) - Audio (mp3)

Click to view or listen or to save, right click & Save Target/Link




Roofing Filters, Transmitted IMD & Receiver Performance

DXCC, Schaumburg IL, 2009

PowerPoint (ppt) - Acrobat (pdf)

Click to view or listen or to save, right click & Save Target/Link




Roofing Filters, Transmitted BW & Receiver Performance

DXCC, Rochester MN, 2009

PowerPoint (ppt) - Acrobat (pdf)

Click to view, or to save, right click & Save Target/Link


DSP Radios - Not Perfect

Dayton Drake Forum, 2007

PowerPoint (ppt) - Acrobat (pdf) : Slide #8 click on speaker to hear sound clip




Radios Used in a Contest Environment

Hamvention 2004

Presentation & Additional Information


Other Tips & White Papers:

* Article posted with permission from ham radio magazine

Receiver Test Data (Updated 23 February 2015 with Elecraft K3 with new synthesizer board)

(Terms Explained: DOC PDF)

 




Links & Shipping

SEI Favorite Links

Shipping Information




Sherwood Engineering Incorporated

Sherwood Engineering Incorporated
1268 South Ogden Street Denver, Colorado 80210 USA
Phone: 303-722-2257     FAX: 303-744-8876     email SEI

Updated
23 February 2015
H Sears, webmaster