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Modifications for the Icom IC-701

 
Extended frequency converage on the ICOM IC-701 HF Transceiver
Computer control of ICOM 701 via accessory connecter

 

 
Extended frequency converage on the ICOM IC-701 HF Transceiver
 
     

Grounding pin 14 on the rear panel accessory connector will extend the frequency ranges to:
 
Band    - Extended coverage - Factory coverage
----------------------------------------------
160m    -   1.0 -  3.0 MHz  -   1.8  -  2.0 MHz

 80m    -   3.0 -  5.0 MHz  -   3.5  -  4.0 MHz

 40m    -   7.0 -  9.0 MHz  -   7.0  -  7.5 MHz 
                                7.3  -  7.5 MHz Receive Only
 
 20m    -  14.0 - 16.0 MHz  -  14.0  - 15.2 MHz 
                               14.35 - 15.2 MHz Receive Only
 
 15m    -  21.0 - 22.0 MHz  -  21.0  - 21.5 MHz
 
 10m    -  28.0 - 30.0 MHz  -  28.0  - 30.0 MHz 
                               29.7  - 30.0 MHz Receive Only

 

 
Computer control of ICOM 701 via accessory connecter
 
     

The August 1984 issue of QST (page 19) has an article on computer controlling the ICOM IC-701 HF transceiver by it's rear panel accessory connector. Although the article describes controlling the radio by a dedicated Three-Chip Microcomputer which can be built for $20 (the cost of the three chips) if you already have some common parts. This project can easily be adapted to control the radio by an IBM PC. Please refer to the QST article for more information. The same interface and control commands also work for the IC-211 and IC-245 transceivers.