The PMRC Digital Education Net

PMRC repeater: 147.030 PL 91

A voice and data net to discuss digital modes

Every Tuesday evening at 1900 (7:00 PM)

Let's meet at  7:00 pm  on  147.030  as usual for a  "no-mic" all digital one-hour net using our most reliable checkin mode  THOR 22.
Listen for instructions at the start of the net with THOR 22.
Always keep your  RxID  turned on to identify the digi mode.

Last weekend saw a great deal of  FLMSG  "Storm Report"  traffic on the HF 80m NBEMS nets.  So let's practice tonight sending sample  "Storm Reports"   from your station.  Open  the FLMSG  and pick  Storm Report, then fill it in with sample  drill message data. You have to SAVE it before FLDIGI  will allow you to send it.  We'll use  MFSK32  for traffic, all centered at  1500 Hz on the waterfall.

For the 8 pm - 9 pm  voice net, I am open for suggestions.  Rig Control did not seem to have much interest.  We've covered  Sound Card Oscilloscopes before, and Satellite Tracking Programs, Winlink,  APRS,  various Packet modes, Packet Sound Modems, YAAC, and a host of other apps in the past few years.

Perhaps it is appropriate to go back and deal with some fundamentals about modulation and digital "modes".  What exactly is  "modulation"?  How is it accomplished?  What is  "data rate",  "symbol rate",  bit depth, error detection and correction?  Why is  RTTY  a digital mode that is disappearing?  Why is there a drop in the fantastic mode  BPSK31  on HF bands?   Why  is the new "top mode"  FT8  so popular right now?
Bring a list of questions to the discussion.

Most of you know that on an FM repeater system, almost all of the FLDIGI modes seem to work reasonably well.  So why do I like THOR more than any of the other options?  Why is  THOR  a good beginner's mode?  Why has  8PSK  been difficult to use on the PMRC repeater?

We've also used the repeater and the DEN  for occasional practice with the very first digital mode  CW  (or MCW as it appears on a repeater).  For those of you who like to operate CW on the HF bands, what do you find works best for you:  a straight key, a keyer, a keyboard?
Should we occasionally do a  CW  practice net, to encourage copying CW "by ear"?


Allstar is a voice over IP communication mode based on the Asterisk PBX platform.
An analog type transceiver is connected to other Allstar nodes via the Internet.

Doug, WA3DSP, developed the code to run Allstar with an inexpensive Raspberry PI.

For more information see:

Thanks to Doug and the Philmont club for setting this up.


If anyone is interested in HF NBEMS nets there is a group called Pa NBEMS Net

To join the group click here: PA NBEMS

NBEMS stands for Narrow Band Emergency Messaging System.

The Pa NBEMS Net meets every Sunday morning at 0800L using Fldigi at 3.583
Barry, K3EUI, is the net manager.

We would like to see more participation from the DEN members.