NCDXC Meetings

NCDXC meetings are held on the 3rd Thursday of each month.

We Welcome All Guests!

Next Regular Meeting

Date: Thursday, May 19, 2016

Time: 5:00 PM Socialize, 6:00 PM Dinner, 7:00 PM Meeting starts

Location:  Holder's Country Inn; 998 S. De Anza Boulevard; San Jose, CA 95129

Phone: (408) 244-2798

Program: "PureSignal ‐ Linearizing Your Amplifier with Software"
by Warren Pratt, NRØV

Over the past several decades, amateur radio receiver performance has improved significantly; however, transmitter performance in terms of spurious outputs, specifically IMD (Inter‐Modulation Distortion), has degraded. Transmitters such as the venerable Collins 32S‐3, introduced c. 1962, are measured to have superior IMD performance compared to today's transceivers using MOSFET amplifiers. IMD, a form of "splatter," is often the limiting factor in our ability to successfully make contacts today. Accumulated IMD from multiple stations significantly raises the noise and interference levels on our bands. As a result, there is a growing interest in the amateur community in improving transmitted signal purity and cleaning up the ham bands. Warren will present a technique to dramatically reduce IMD. This technique was designed for Direct‐Sampling Software‐Defined‐Radios as part of the openHPSDR program. The software solution is open source and is integrated into the software console for the Apache Labs series of ANAN transceivers. He will cover the basics of DS‐SDRs, explain the source of IMD, describe the solution to reduce IMD, and show examples and results from a few of the hundreds or thousands of amateurs now using this technology. Warren was awarded the 2014 ARRL Technical Innovation Award for his research and development in this area.

Note: Meeting will also be broadcast online via Webex. Logon as follows:

NCDXC Meeting
Thursday, May 19, 2016
6:30 PM PST

Join WebEx meeting
Meeting number: 802 799 450
Meeting password: dxcc

Join by phone
Access code:  
802 799 450

Past Meetings
Click on The Year/Month Below For A Past Meeting

Jan Feb Mar Apr                

Next Board Meeting
If club members (those not currently board members or ex-officio members) wish to attend the meeting please let K6MKF know prior to the meeting date so that meeting instructions can be sent to you by e-mail.

Copyright © Northern California DX Club. All Rights Rreserved. Webmaster: K6MM