Enabling the WARC Bands on the IC-740 etc.

by Axel Hustedt, DK9BDN

The pencil points to the jumper. Image copyright © 2003, Axel Hustedt DK9BDN.

Finally I found out how to enable the WARC bands on the IC-740! 

There is a jumper which blocks transmitting on the WARC bands. The transmitter keys  up, but there is no output. 

So, if anyone finds an IC-740 that is not transmitting on those bands: locate and cut  the jumper near R33, D31 and J1 on the RF UNIT on the bottom side near the PA UNIT, as shown on the picture. The pencil points to the jumper.

The IC-740 brochures had a note about no transmit on 17m and 12m; this inspired me to make the above information available.

Here are links to two other IC-740 mods which I found:

  1. IF compressor switch wetting-current mod

  2. RF preamp relay wetting-current mod

73,

Axel, DK9BDN

Contents copyright © 2003(including photo) Axel Hustedt, DK9BDN. All rights reserved.

 A. Farson VA7OJ/AB4OJ edited Axel's original text and created this page.
Last updated: 08/28/2016

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