All Band Transmit Modification Icom IC-7300 Full Explanation w/ Test at End!

Just so you know, it appears if you make the mod, you can still lock out the Out Of Band transmit in the menu by going to Set=>Function=>Band Edge Beep=> set to On(User) & TX Limit. This appears to highlight the Transmit Limit with the red dashed line around the TX symbol at top left of display and physically limit transmit just like when the Diode was there. Effectively, the radio software now appears to give you a menu option to open it up for a life or death emergency or zombie apocolypse if ever needed with the mod, but function like the hardware (diode) is stock with TX Limit selected. I'd highly recommend if you do the Mod, set the menu to limit this transmit as it is illegal anywhere outside the HAM Bands and this way you won't be able to transmit outside the HAM bands if you accidentally lean on the transmit button or etc.. BTW... thanks for taking the time to make a video. I know it takes effort to do that.

You have an awesome voice for a Radio Announcer. Thanks for the video. 73 from Australia

no need for solder there.. a little flux if anything would have been better imho. when it comes to removing SMD stuff i find just a little upward pressure via tweezers and a lil heat is all you need, one side at a time..

I did this, it worked, i had to use a magnifying glass to see. Thanks for the video.

thanks buddy, I just got my 7300 still playing around with it and learning it. Will do the mars mod in a few days. Great video. thanks.

Best storage for removed parts I use is to cleanly one leg of part to "one" of the pads you removed it from as a place holder. That way it's stored and you know where it was placed originally.

You bridged a couple & the whole world saw! Thanks for the mod. ** Did you know that the beastly Icom 740 can be opened up from 24.900 mc through 28.100 mc - using an 8 position- 4 wafer rotary, & a few 2.2k resistors, a relay to prevent transmit, and some wire. You'll find the components to clip/ jump on the HPL unit. Clipping is safe. Do not jump without using buffer resistors (2.2k). Clipping & jumping step by step will easily be used to figure out the correct wiring as it's a switching matrix. A very nice mod... A bit involved it's not for the inexperienced to take on, just letting you know. This mod is well worth doing to the Icom 740 because it's such a good rig. This mod. functions when the radios band switch is set to 28.0 and each position on the rotary switch you use will jump 500kc. Of course the display won't show the change but at an even 500 kc ~ 3.0mc shift, the math is nothing. Please be SURE to include the necessary relay switching to prevent accidental transmit where you don't belong as this is for RX pourposes only. Don't use a crystal switch to make the 740 general coverage. Also, a decent AM detector can be made and used for AM receive when the rig is on USB.

You are the master of soldering!

Great presentation and unique modification on the IC-7300! Thanks!

Good to know easy enough. I know you had to clean that mess up because I saw one heck of a good bridge there between the diode you took out and the next one in line with it. What a mess. That looked scary to me. I'm glad I can do much better than that here.

perfect cb radio !!! highly recomended

Got it done and took only a few seconds. Thanks for the video and 73!

Well I took out diode 422 as you showed and I do not have transmit on 27.425 lsb either. So I did a reset too and still no output power on 11 meters. Any ideas? I went back to see if there was any residual solder on the circuits and couldn't see any, I have a set of eyeglasses with different magnification coming maybe I can see better with them or I will have to buy a microscope to see even better into this circuit.

Watching you run this radio shows me how very little I still know.

Thanks for sharing. I want one of these like everything else.😎

How about lifting one lead of diode instead of removing it?

I have a Japanese IC-9100 that is closed to a large part of the US VHF/UHF frequencies. Wish I could do a mod like this to get on the US authorized frequencies.

There are mods for the iC-7100 (which I have as well. The main valid reason I might want to do this is to get 630 meters. Operating the 7100 on 630 requires a fairly elaborate diplexor which splits the low pass to the antenna and the high pass (harmonic spurs) to a dummy load.

First thing I'll be doing with my brand new IC-7300 when it arrives.

These are a great radio - got to experience one last night. Its amazing the number of people who buy Amateur sets and freeband - just set your radio to the audio analyzer and spectrum scope split screen, tune to an active frequency on 11m and watch - the legit CB radios have awful signals, and the modified amateur sets have awesome signals. Of course the set my mate brought over has not been modified as he has a normal CB to talk on if he wants to play on 11m - he has only just brought it, and is apprehensive of voiding his warranty on a brand new set.