Digital soundcard technology and Amateur/Ham Radio


Here’s the latest update from Joseph Speroni (AH0A), ARRL Pacific Section Manager.

Views expressed in this Amateur/Ham Radio News summary are those of the reporters and correspondents.

Content supplied by Joseph Speroni (AH0A).

Accessed on 27 May 2020, 1445 UTC, Post 1455.

Source (email from Joseph Speroni-AH0A):

Please click link or scroll down to read the full message.


Aloha all,

Amateur Radio soundcard-based message digital technologies continue to
develop apace.  It is hard to believe that just a few years ago we had
only two Winlink protocols – Winmor, an inexpensive soundcard slow
software modem, and Pactor, an expensive fast hardware modem.

Part 97.1 “Basic Purpose” reminds us of a major purpose of the Amateur
Radio Service

“(b) Continuation and extension of the amateur’s proven ability to
contribute to the advancement of the radio art”.

Advancements in the last two years produced  protocols called ARDOP,
VARA HF 2.0 and 3.0  and a new very high-speed VHF protocol VARA FM.

The next release of VARA HF 4.0 on June 30th, provides speed and
accuracy challenging expensive Pactor modem hardware. (see front page)

VARA HF 4.0 will introduce a new 500 Hz protocol that, if the simulation
is proved right, will give throughput beyond Pactor-2 (500Hz) hardware
with better reliability.  This narrowband protocol will open more
frequencies to message handling.

A new study published by Tom Whiteside (N5TW) uses theIonosphere Noise
Simulator (IONOS) to compare the many different message protocols in
varying propagation conditions.  This well-written paper documents where
digital technologies are today and gives us hope of further

A copy of Tom’s paper is on the Winlink web site at

Give it a read.  Exciting developments!

ARRL Pacific Section
Section Manager: Joseph Speroni, AH0A

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For the latest Amateur/Ham Radio news and information, please check this blog daily.  News feeds are updated daily and weekly.  Thanks for joining us today.

Aloha es 73 de Russell Roberts (KH6JRM)

Public Information Coordinator

Hawaii County, ARRL Pacific Section (breaking Amateur/Ham Radio News)

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