Modifications for the ICOM - RogerK

19-07-1998(IC-228) IC-228 modsI have the mod info from ICOM. It is best to have the diagram in front of you when performing the mod, but for the bold ones,here goes:There are three PC boards in the rig. The TX and RX boards are on the top and bottom of the rig. The logic board is behind thefront panel, and the LCD display and front panel switches are mounted on it. It is the logic board which will be the object of yoursurgery.1. Remove D-192. Install D-7 - (Type 1SS193)D 7 should have three terminals, but only one is used.It looks something like this:| C-----------| / || / |-----------A| |There is no connection to the terminal on the lower right. The Cathode of a 1N914 diode Can be connected to the upper terminal,and the Anode to the lower left. (as indicated by the C and A.In locating the positions of D-19 and D-7, reference the lithium battery.D-19 is at the 1 O'clock position near the edge of the board, and D-7 is at 2 O'Clock and adjacent to the battery.Date: 25-08-1999 User comment From: webmasterSubject: What did this modification.?Please mail me if you know what this modification do.?Best regardsErik Hansen - OZ2AEPwebmasterwww.mods.dkThis modification is read 705 times.top of page19-07-1998(IC-229) IC-229H, and AM aviation band modificationEons ago, I asked:> Does anyone know what is required to make an Icom IC-229A (or IC-229H)> receive in the aviation band (118-136 MHz or so)?>> For an IC-2SAT handheld, it's just a three-button-down-during-power-up> sequence, and it does AM demodulation in that subband. Is it so simple> with the IC-229A/H? I called the Icom info line, but they were far from> helpful. Eventually said "yes, it does do AM demodulation in that band",> but were very reluctant to admit that and flat out said no way they'd tell> you how to do it. Sounded like CYA paranoia regarding type acceptance....Quick summary:●●●Yes, it does do AM demodulation. Many people are unhappy with its performance, but I was impressed. Variation in radios,or variation in tastes, who knows....Yes, it requires a hardware mod. No, the procedure described in "CQ" magazine is not exactly right. Yes, it is easy to do.It has a wide bandwidth and is sensitive. Therefore, you may have intermod problems.