To: Icom 735 users - ModsAndRepairs Forum at eHam.net

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eHam.net Forum : ModsAndRepairs : To: Icom 735 users

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To: Icom 735 users	Reply
by KB7QND on October 25, 2009	Mail this to a friend!
I posted this same topic under the MARS section of the forum since they use modified radios. I have an Icom 735 HF transceiver. I would like to modify the radio for future MARS operations and to allow transmit on the HAM 60 meter band (which it doesn't allow now). Numerous sources say to cut diodes D33 and D34; which I've located and would be easy to do myself. My questions revolve around the result of doing that. Has anyone had any problems develop from doing this? Short term problems? Long term problems? TX/RX frequency stability? Should I do this myself or have the Icom Service Center do it and check the radio afterwards? I just want to make sure I can trust the info found on the internet as I don't want to ruin an expensive radio. Thanks.

RE: To: Icom 735 users	Reply
by AA4PB on October 25, 2009	Mail this to a friend!
I've done it with other Icom radios. As long as you don't short something in the process you shouldn't have any problems. Some Icoms don't function well on 60M even after you open them up so that you can tune that band. I've heard of heat and damage problems while trying to transmit on 60M with some Icom radios - be sure to check it out first, either with Icom or with someone who has done it with that particular radio.

RE: To: Icom 735 users	Reply
by K0CBA on October 30, 2009	Mail this to a friend!
I doubt if Icom will do it as it is an unapproved mod. It will open up the entire range of transmitting BUT you will be taking a chance with spectral purity as it exceeds the design of the radio and the internal filtering. If you insist on cutting the diodes, I would suggest nipping them in a position where you can re-solder the leads if need be....especially if you sell the rig. Your intentions may be righteous but the next owner may not be as pure of heart. 10-4!? BTW: I have only tried 60 meters once and found little interest in 'channelized' operation but, it did work with my 'opened' 735.

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