The Radio Information Board

OK, for all you who might need it, here is the schematic of the Kenwood KPG-4 programming adapter. This is an adapter I designed and built by making a few minor changes to someone else's design. The biggest change I made was the use of the Maxim MAX233CPP instead of the MAX232 IC, because the MAX233 chip doesn't need external 'charge-pump' capacitors like the MAX232 does. I also added a bridge rectifier to the power supply input. I like doing that because it makes circuits such as this immune to 'reverse polarity mistakes'.

If anyone finds any mistakes I made while making the schematic, let me know, and I'll fix it. Enjoy!

Here is also the schematic of the plugs for the KPG-22 programming cable used with some Kenwood portables. It uses the same circuitry as the KPG-4 shown above. As with the KPG-4 schematic, if anyone finds any mistakes, please let me know so I can correct them.

Hey Brett, where did the pictures go?

Don't know. The board appeared to have some linking problems or something for a while there. They are appearing fine for me at the moment, but your mileage may vary. If you continue to have problems viewing them, and need the schematics, give me an email addy and I'll send them directly to you.

It's my stupid computer....

schematic looks great -

i use 6 from the radio - it has voltage on it

then you dont need an external source and dont have reverse polarity problems

would need an external pwr source for the HT version - but mobiles would work great without 1

avtarsingh wrote:i use 6 from the radio - it has voltage on it

What level is the voltage at pin 6? I may go back and re-work it to include that feature. Thanks for the tip!

it's 12v

- just run the 12v into the 78L05 and also i suggest .01 caps on each side of the 78L05 just in case

i have been using this method for years - the max233cpp is a nice step tho - saves a few caps

oh also works on 80 series radios as well as 40 series

you still need a battery if you are doign the HT design

i am testing now (once i get my 690 going) - on making a female adaptor so that you can plug the kpg4 into a 90 series radio by unplugging the mic from the mic head - if you get what i mean

OK, thanks for the tip. 12v would indeed be easy to use as a substitute for the external power supply. I'll go back and work that into my schematic.

As for the adapter to use with the '90 series radio, I do indeed know what you mean. sounds like an idea to me . I'm not familiar with all the different models of radios the KPG-4 is compatible with (or can be made compatible with). Give me a list, and I'll include that with the schematic as well.

i might have missed a few...but not many

KPG-4
TK-7102, TK-7108, TK-8102, TK-8108, TK-760, TK-760GK, TK-762, TK-762G (VHF 8Ch), TK-768, TK-768G (VHF 128Ch), TK-780, TK-840, TK-840UF, TK-862, TK-862G (UHF 8Ch), TK-863G, TK-868, TK-868G (UHF 8Ch), TK-868G (UHF 128Ch),TK-940, TK-941, TK-840, TK-752, TK-759, TK-852, TK-859, TK-715, TK-815, TK-740, TK-705D, TK-805D, TK-706D, TK-806D, TK-630, TK-730, TK-830, TK-709, TK-809, TK-840, TK-760, TK-860, TK-762, TK-862, TK-760G, TK-860G, TK-780, TK-880, TKR-750, TK-885, TK-980, TKR-900, TKR-850, TK-7102, TK-8102, TK-7108, TK-8108, TK-768, TK-868, TK-768G, TK-868G,TH-F6,TH-F7

KPG-22
TK-240, TK-250, TK-260, TK-260G, TK-270, TK-270G, TK-272G, TK-278, TK-278G, TK-340, TK-349, TK349, TK-350, TK-353, TK-360, TK-360G, TK-370, TK-370G, TK-372G, TK-373G, TK-378, TK-378G, TK-430, TK-431, TK-630, TK-730, TK-830, TK-2118, TK-3118, TK-2100, TK-3100, TK-3101, TK-2102, TK-2107, TK-3102, TK-3107

KPG-46
TK-760 TK-760G TK-860 TK-860G TK-762 TK-763 TK-862 TK-768 TK-868 TK-780 TK-880 TK-980 TK-785 TK-885 TKR-740 TKR-750 TKR-840 TKR-850

KPG-36

TK280,TK380,TK480

Thanks for the info. I'll include it with the schematic, with a mention of you, of course .

thanks

I am not very inclined to electrical work. Can I aquire one from someone besides ebay? Maybe ? you can email me znb10@yahoo.com

I have Kenwood TK-270G that I need to reprogram. Could someone send me the schematic of the Kenwood KPG-22 programing adapter.

What about program software for win Xp.

Thanks

Bill Dickerson