Harris Radio Systems

Updated: 17 December 2006


The RF-2305 seems to be some sort of commercial version of a military unit. Perhaps
and early version of the later RF-3200 series that has since reached EOL.
The basic specifications state:
Harris RF-2305 Receiver/Exciter SSB/AM/CW 100KHz-30MHz 
Unit covers 100 to 29,9999 kHz 

Also check here: http://www.rigpix.com/protrx/harris_rf2305.htm

From the Harris RF Site:


Another person is installing one at his work place: http://www.ontariorocks.ca/blair/radioiron.html

 * See http://www.rigpix.com/protrx/harris_rf2305.htm for more information

 * The Amplifier is the RF-110A and can be seen here: http://home.stny.rr.com/n2bc/Harris_RF-110A.htm

 * See this place to buy them: http://www.radioesoterica.com/cgi-bin/store/commerce.cgi?product=14

 * Manuals in part are here: http://petergottlieb.com/links.html

September 2005

RF-7210	Receiver-Exciter control system, has 2nd generation ALE (AUTOLINK II) capabilities 
	plus HF squelch, this equipment is early 1980's design

	System Overview
	RF-7210A Operators Card Page 1 (.jpg)
	RF-7210A Operators Card Page 2 (.jpg)
	RF-7210A Operators Card Page 3 (.jpg)


MilSpec Communications Fundementals of ALE page

Here is the manual to read. Be prepared for a BIG download - it is about 35 MB in a zipped version but it is a complete manual. Harris RF-7210 ALE Controller

Here is the ASCII control data information. Click here

Here is the documents on the AN/URC-81 and 83 System which is based on the RT-1446 system. When interconnected with the RF-7210 series ALE controller, provides a very useful ALE system capable of full access to most networks.

This is the information. Click here It is a zip of about 65 MB and has 5 sections.

Credit is given to the team below for all the work on the Harris collection of data.

Additionally, you may wish to check the Missoula County Auxiliary Communications Service site where more technical infomation is available on some of the above systems. This site has a number of pictures that provide useful information. There are limited technical documents available also.

Automatic Link Establishment (ALE)

For more information about ALE and how the HF-80 and later generation HF radios were to be controlled, please go to the NTIA Report on ALE technology. In summary, this site discusses the following:

"High frequency (HF) communications has been an essential part of worldwide information transmission 
since the advent of radio and has advanced nearly in step with information technology.  
Today, advanced thinkers in the field envision HF radio technology as embracing and supporting 
such technological advances as HF e-mail and compressed multimedia voice and data services.  
A guide has long been needed that brings together into one concise user's handbook all 
of the working knowledge of HF Automatic Link Establishment (ALE) radio technology.  
Many publications exist that deal with one or more aspects of this technology - sometimes in great detail.  
This guide, which is general in scope, provides a broad approach.  
It is a tutorial for explaining the basics of this HF ALE technology and for passing along 
working knowledge for hands-on operation of HF ALE systems.  
This guide is the product of many authors who have combined their considerable expertise."

Rockwell-Collins presentation on ALE evolution is here

And if you really need bed time reading material, try reading the MIL-STD document on ALE (188-141). MIL-STD-188-141B or the 188-110B document on HF modems.

To quote the document summary:

"This document contains technical standards and design objectives for medium and high-frequency radio systems. Included are: (1) the basic radio parameters to support both conventional and adaptive radio communications; and (2) technical parameters for automatic link establishment (ALE), linking protection, and other advanced adaptive features and functions."

And the ALE Operations manual for US Forces is here

More ALE data can be found here at the ARRL site at this link

Want to listen to ALE? Go here!

Have lots of spare money, buy one of these to solve your ALE needs: Rockwell-Collins ALE

Informal list of ALE users from Ominous-Valve or a backup copy is here. Other utility listening sites for ALE modes include:

	World Utility Network

I find HF is an interesting technology with still considerable promise as a global wireless technology. The key phase I use often is "use the right technology to solve the right problem".

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