The NB6GC / KO6NO Remote Adapter For the Harris RF350K and RT-1446/URC 
 
(4/10/2010 - NOTE:  There have been a number of requests for Remote Adapters after all units were sold.  We are considering a second smaller production.  The price may be higher because of higher PCB costs.  We will decide after querying previous buyers and requestors.  If you are interested, please submit a comment in the form below.) 
 
(6/21/2010 - NOTE: A second production of twenty Remote Adapters is in progress.  Due to increased costs of parts and circuit boards, the price is expected to be $65 for assembled units and $45 for kits. ) 
 
(7/16/2010 - NOTE: Remote Adapters are now in stock and the first five orders have been shipped.  Available Assembled & Tested or in Kit form. ) 
 
(2/28/2012 - NOTE: The last Remote Adapter has been sold.  No further production is planned. Version 604M EPROMS can still be obtained. ) 
 
Stop pushing front panel buttons to operate your Harris radio.  Take advantage of the remote control features built into your radio.  Use your computer to monitor and control: 
 
Frequency 
Mode 
AGC 
RF Gain 
Audio Source 
and More 
 
from a PC at a remote operating position.  Harris Radio provided these control features from the beginning of the RT-1446/URC production in 1981. But due to a lack of Remote Control Adapter Modules, many owners have been unable to use Remote Control. 
 
The USS Hornet Amateur Radio Club has created a circuit board to match the RS232 mode of the Harris A1A19 Module for use in the radios of the USS Hornet Aircraft Carrier Museum Amateur Radio Station, NB6GC. 
 
 
 
The NB6GC / KO6NO Remote Adapter, shown above mounted on the front panel of an RT-1446, is capable of baud rates from 300 to 19,200 baud.  Hardware handshaking is built-in so that "Null Modems" are not required.  The module is completely assembled and comes with the ribbon cable necessary to connect to the radio's Control Board.  An Operator's Manual with a schematic diagram is included.  Each adapter and cable are tested before shipping. 
 
The Hornet Amateur Radio Club has also developed software to control the RF350.  The program is in use at the HARC Amateur Radio Station, NB6GC, on USS Hornet.    Go here to download the NB6GC software
 
There are at least two versions of the EPROM program for the radio's Control Board microprocessor.  The version may be determined by examining the labels on the three EPROM chips after lowering the front panel.  The EPROMs are 28 pin DIPs located in the upper right corner.  During the testing of the NB6GC Adapter with NJ7C's software, Dale was able to optimize operation of his program with versions 601C and 604M of the EPROM so that remote control is possible with either version.  However, version 601C does not provide adjustment of the receiver RF Gain and also requires a more complicated method for setting the AGC and Mode. Version 604M also includes a feature to allow programming unique Receive and Transmit frequencies in the memory channels for half duplex (split) operation. 
 
Because only one  RF350 on USS Hornet had version 604M installed, we set up a facility to create and install version 604M chips.  For owners of RF350 or RT-1446/URC units, we can provide EPROMS programmed with Version 604M.  Because the contents of the EPROMs are copyrighted material of Harris Radio, we are offering this as a service at a price equivalent to the cost of EPROM chips and shipping.  All EPROMs are clearly marked with the original copyright label of Harris Radio. 
 
Order EPROMs 
 
Thanks to the many purchasers over the last two years, all of the first production units were sold.  For anyone interested in creating their own board, we have decided to place the schematic and artwork on line for download.  The schematic and pcb files were created by using ExpressSCH and ExpressPCB which are available free from their website.   
 
Download Remote Adapter files 
Download Harris RF350  EPROM image files 
 
(2/28/2012 - NOTE: The last Remote Adapter of the second production has been sold.  No further production is planned but several bare circuit boards and incomplete parts kits are available. Version 604M EPROMS can still be obtained. )