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   TR-7 Enhanced SSB Filter Back In Stock. FINAL production run!   NOTE --


How To Tips, White Papers, & Presentations:

Roofing Filters, Transmitted BW & Receiver Performnce

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) - February 2008

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

Click to view or listen 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 29 September 2014 with FlexRadio Systems 6700)

 

SE-3 -- No longer in production after 30 years -- Watch eBay for used SE-3s


SE-3 MK IV

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

SE-6 Switch Box

Japan Radios NRD models

Icom R9000 | R8500

 

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
15 February 2009
T Cantrell, webmaster