Past club meeting presentations

At our monthly club meetings we have a short 15-20 minute presentation on a ham radio related topic. This page provides links to past presentations. If you have any comments or suggestions for future presentations, drop a line to Dave Wickert, AE7TD


Past club meeting presentations:  (topics and links):

Time From Space” guided by Don Sayler, W7OXF. What is NTP? Why does it matter? Why does it matter to ham radio? How to build an NTP Server with a Raspberry Pi and a GPS receiver – and then configure a client computer to use it. The presentation is available here. (March 2019)

2dB or not 2dB: That is the Question (Again)” guided by Karl Moellmer, W7BVP. This is part 2 of Karl’s Aug 2018 presentation expanded to include SWR and signal report calculations. The presentation is available here. (Jan 2019)

Small Magnetic Loops: A Beginner’s Guide” by Dave Wickert, AE7TD. The presentation is available here. (Nov 2018)

Antenna Alley Planning” guided by Dave Wickert, AE7TD. As part of our “Go Portable!” program this presentation discusses what we hope to be able to do for antennas now that our go-box is debut. The presentation is available here. (Sept 2018)

To dB or not to dB: That is the Question” guided by Karl Moellmer, W7BVP. Find out what a submarine, a mosquito, a jet engine, and a logarithmic power function have in common. The presentation is available here. (Aug 2018)

“Go-kit your way to freedom!” An open panel discussion with James Hansen K1IMO, John Nance KI7PMJ, and Tom Early KE7PWL; an overview available here. (May 2018)

“So . . how does this J-Pole thingamabob work?” Dave Wickert, AE7TD is available here. (Jan 2018)

“Hams Without Borders” Jane Wickert, N7JCW is available here. (Nov 2017)

“WSPR” Don Sayler, W7OXR is available here. (Oct 2017)

“Dayton 2017 Hamvention” Dave Wickert, AE7TD is available here. (Aug 2017)

“APRS” Don Sayler, W7OXR is available here. (July 2017) — additional APRS info here as well (from Jim Shaw’s WA6PX notes)

“IRLP, Echolink, and going portable with Nano-Node!” Phil Sohn, K7APS is available here. (May 2017)

“Pi-Gate Introduction” presentation is available here. (Jan 2017)

“Batteries and Generators and Inverters . . . Oh My!” Don Sayler, W7OXR is available here.  (Oct 2016)

“Buying Your First Radio: A Systematic Approach” Dave Wickert, AE7TD is available here.  (Sept 2016)

“FCC and its Personal Radio Services” Dave Wickert, AE7TD is available here.  (Apr 2016)

“National Parks On-The-Air (NPOTA)” Dave Wickert, AE7TD is available here.  (Jan 2016)

“Ham licensing” Dave Wickert, AE7TD is available here.  (Sept 2015)

Links provided from earlier topics:

EchoLink:  — communicating over the Internet using streaming audio

Winlink 2000: — email by radio 🙂

Instructions for build our Morse Code Oscillator Kit is here:

A *great* article on Crossband repeat is here:


IRLP “mini-brain course”: (from Oct 2015 presentation)

Difference between DSTAR, Echolink, and IRLP

  • IRLP requires a radio.  You can’t connect to an IRLP node by computer.  This is by design, because the R in IRLP stands for Radio.

How It Works:

  • Developed by David Cameron, VE7LTD
  • Runs on Linux for stability and a little more hacker-proofness
  • Radio ” VOIP ” Internet ” VOIP ” Radio:

Audio is received, and sent to the IRLP computer.  It is digitized, compressed, and transmitted over the internet to the selected node.  Once received, the audio is decompressed, restored, and sent to the radio for transmission.

Two modes:

  • Direct One to One, or One to Many through a reflector.  A reflector has no radio, but listens to traffic from any connected node, and retransmits that traffic to all other connected nodes.

Simplex or Duplex (repeater) Operation

  • IRLP nodes can operate in simplex mode or through a repeater. The node in Antarctica is a simplex node.


  • IRLP nodes have built-in ID system w/ cw. We don’t use it, the repeater does the identification.

Making a connection:

  • On a DTMF pad, key in the 4-digit node number to connect to.
  • K7LWH repeater does not require a pound-sign or asterisk before the node number, other machines might.


  • Before dialing up a node, listen to the repeater to make sure no one is in a QSO (just like for a normal QSO).
  • Say your callsign, then “accessing IRLP”.  Key in the 4-digit node number.
  • There is some latency with IRLP.  Once connected, delay speaking for a second or two after keying the mic.
  • Wait a second or two when done speaking before unkeying the mic.
  • When the QSO is finished, say your callsign, followed by “dropping link”.  Then key in ‘73’ on the keypad.
  • Normal ham radio courtesy.

If using a reflector, a few more rules apply:

  • Wait 10 seconds or so after connecting to a reflector to see if anyone is using it.
  • Avoid local QSOs on a reflector.
  • Calling CQ is OK (instead of ‘W7OXR Listening”).
  • Avoid long-winded rag chewing.

Finding a node to connect to:

Cool nodes:

  • 3978 Kirkland, Washington
  • 7898 Yamanota, Aruba
  • 8838 Palmer Station, Antarctica
  • 9999 Echo Reflector
  • Soon: Nepal

The status of any node can be obtained by, where is the node number, for example

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