W9AB

Marc Officers for 2023

2023-01-05 by Rev. Fr. Robert Bower W9RWB WRPH745

At tonight's MARC board meeting officer assignments were made.

President - Dave Ellis K9AWT

Vice President - Pete Shaw KB9ZRV

Secretary - Robert Bower W9RWB

Treasurer - Bob Paton KD9TGU

Member at Large - Scott Coppersmith KD9QOG

Scott (KD9QOG) and His Satellite Antennas

2022-12-05 by Barry Keating

The November MARC Member Meeting was a presentation on the use of Amateur Radio Satellites by Scott (KD9QOG). Scott took us through both the simple way to make contacts with a handheld radio and antenna as well as the “industrial strength” version of making satellite contacts with a $6,000 set of dual Yagi Antennas and an automatic azimuth/elevation control linked to a program that uses the Keplerian coordinates of the intended satellite to “aim” the antennas.

Note the large Yaesu rotors that control the large array. They track the satellite as it makes its pass over the user's location. The antennas are always aimed at the satellite from the acquisition of signal (AOS) of the pass through the loss of signal (LOS).

Scott also had exciting news for MARC Members as the club has joined with the University of Notre Dame and the Robinson Learning Center to submit an application for an ARISS (Amateur Radio on the International Space Station) contact reservation.

If accepted, this will allow MARC Members to participate in the setup and initiation of the contact sometime in the New Year (probably late in the year). These reserved contacts take place on special frequencies and at appointed times to avoid interference. Some of you will remember the MARC ARISS contact that was arranged for Stanley Clark School; over 400 students were in attendance for what was a perfect QSO with the ISS! 12 students were able to speak with Astronaut Peggy Whitson.

PDF of Scott's Slides

How I installed LinPac

2022-11-14 by Rev. Fr. Robert Bower W9RWB WRPH745

LinPac

LinPac is a program to connect to a packet BBS or do Keyboard to Keyboard Radio Communication.

Watch Keyboard to Keyboard Radio Coms with AX.25 and Linpac! and VA7SHG - LinPac - Packet radio on linux, beyond Winlink and APRS to get the idea.

The guides I used were Direwolf soundcard packet on Linux, with ax25 and LinPacSetting up Packet Radio on a Raspberry Pi (4 thru Zero-W) running Raspberry Pi OS Bullseye, Buster, Stretch or Jessie.

My system is a 64 bit Intel based laptop running an Ubuntu derivative connect to a G90. Installing LinPac on my laptop for use with my G90 required a few modifications from the first set of instructions. Many of the changes I used were in the second set of instructions.

My changes

  1. The best way to control a G90 is to use Flrig.

  2. Besides installing Flrig, hamlib needs to be installed.

  3. direwolf.conf needs to be edited to be used with hamlib.

PPT 2 localhost:4532
  1. Since LinPac is being used on HF the modem speed in direwolf.conf needs to be changed:
MODEM 300 1600:1800 7@30 /4
  1. After installing all the packages for AX.25 the /etc/ax25axports file needs to be edited:

Replace my call sign with yours including SSID

wl2k W9RWB-3 300 255 7 HF

The first entry is just the name of the port. I used wl2k but you can name the port anything you like. The second is your call sign with SSID. The third is desired modem speed. Since I am on HF I used 300. I am not sure what the 255 is but every example had it. I am also unsure about the next number but if you are doing UHF use 2 and if you are doing HF use 7. The next is just a description of the port.

  1. Making listen work properly
sudo chmod 4755 /usr/bin/listen

or

sudo chmod 4755 /usr/bin/axlisten
  1. Install LinPac

How to start LinPac.

  1. Start Flrig and make sure it is connected to your radio.

  2. Run the following in a terminal window and let it run. This is command connects hamlib to flrig.

rigctld -m 4 -vvvv
  1. Start direwolf with the following command: (Replace direwolf-ax25.conf with the name of your configuration file.)
direwolf -t 0 -p -B 300 -X 16 -d tx -c direwolf-ax25.conf

Only use the command options if you want to use FX.25 in place of AX.25

-X 16 and -d tx
  1. Run the following command:
sudo kissattach /dev/ptmx wl2k

sudo kissparms -c 1 -p wl2k -t 300 -l 30 -s 20 -80 -f n

linpac