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ICOM IC-208H extended Rx and Tx mod
Posted: Tue Dec 21, 2010 2:04 pm
by BlueMurder
Is the below link the same procedure you guys in the know would use or have used to extend Rx and Tx on your IC208H.
I come across it on the interwebz and thought i would check in to see.
Much appreciated everybody.
http://www.hampedia.net/icom/ic-208h-ex ... tx-mod.php
ICOM IC-208H extended Rx and Tx mod
Posted: Tue Dec 21, 2010 8:45 pm
by Phantom
All I can suggest - if you are asking about the mod to expand the range of the 208H - then one would guess that you should not even be mucking around with the insides of any radio
By the sounds of it - you may be on the quick path the turning a good 2/70 radio into a brick!
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Tue Dec 21, 2010 8:48 pm
by youngn
Does the IC-208H come with UHF CB out of the box???
ICOM IC-208H extended Rx and Tx mod
Posted: Wed Dec 22, 2010 6:32 am
by Phantom
Rx only (out of the box)
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Mon Feb 07, 2011 10:36 pm
by 878ROB
I done this mod to my 208H... easy mod, please do not attempt if you dont have a super dooper eyesight or magnifying glass as the 2 resistors are very small, my radio worked perfectly fine after i did the mod...
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Wed Feb 09, 2011 12:03 pm
by jaskel
Same here, worked a treat for me! the resistors basically break apart once u heat them.
TX and RX on UHF CB fine.
The output is far lower than what u get from 2m or 70cm.
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Thu Feb 10, 2011 11:49 pm
by 878ROB
yes you should not operate the radio at full power!!!! keep it around mid level to keep the ass end happy...
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Mon Jul 08, 2013 7:16 pm
by ozstickman
Thats what amps are for....
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Tue Feb 04, 2014 7:20 pm
by ozstickman
after my old UHF CB dieing the other week I thought I'd give my 208 a go as a UHF CB but I have discovered that the SWR is way too high, it was up around 4:1. Yes I did check to make sure the antenna and lead was in good condition. I checked it on my other car with a TX4400 and got a SWR of 1.5:1.
So with this I say would not recommmend TXing on the 477 CB range too much.
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Wed Feb 05, 2014 3:36 pm
by melbourneradio
Not a good idea .. not going over this again .. but really people still dont get it
Sent from my GT-I9305T using Tapatalk
Re: ICOM IC-208H extended Rx and Tx mod
Posted: Thu Mar 10, 2016 8:46 pm
by Schermann
Please, how to REVERSE this mod?
Does anyone know how to reverse this so that an IC-208H can be returned to AUS spec and lock out any TX on the UHF CB band?
Ok, here is the
matrix diode list from the Icom IC-208H Service manual pertaining to TX/RX bandwidths.
http://www.radiomanual.info/schemi/IC208H_serv.pdf
...and here is the Matrix schematic from the service manual showing the 16 slot configurations for the S.Diodes (not resistors)!
NOTE: Position indicated above at D508 corresponds to the AUS spec but is that the only diode that is to be put back???
Any ideas as this is not covered anywhere!
