MS and MD1 RF fregency PAL I to G problem...

[MEGADRIVE Jeroi]

Well UK uses PAL I signal and Rest europe uses G I guess. I am having problems that uk rf modulator for master system and megadrive1 dont work with PAL G standard television.

Normal MD2 switchbox have little switch where you can change fregency from I to G and it works.

How ever, I have 3 older sega hardware and they send I standart and not G and sega MD1 manual switchbox dont have I to G switch.

Is there way to mod sega md/genesis1 to send different fregensy signal?

the problem is not picture, but sound. Sound is dissortion only with PAL I signal. But Pal G signal gives audio.

[retrospiel]

I'd recommend RGB-SCART instead of RF.

[MEGADRIVE Jeroi]

Since I am the only finnish who sells megadrive consoles these days, I must buy them from UK or German. Uk consoles comes bundled with Pal I rf output. Is there any solder tips how to change the rf output to output Pal G?

As I am reselling these machines I dont have interest of buying expensive cables just for the resell as no-one will buy the machine with added expenses of buyn a cable. This is the reason why I would mod the rf unit on Master system and MD1.

[retrospiel]

I see, but a) these cables go for like 6,- bucks, and b) there's no need to mod the PAL output since RGB is not PAL, but RGB.

[MEGADRIVE Jeroi]

But I cannot sell Pal I rf cable with MD, it needs to be Pal G. Thos who buy from me can buy their rgb cables on their own. But I must sell complete console bundel with power and rf lead. If rf lead dont work I cannot sell them.

This is the reason. Yes I sell also rgb scart cables, so that is not problem for me. Only thing is that I need the machine to output pal-g rf signal. Atleast you can change region of megadrive relatively simple soldering job. Is there any ways to change rf output from PAL-I region to PAL-G? Also this is audio related. I dont need video to change, only audio transmit signal. Any solder experts out there?

[Jorge Nuno]

That stuff is built in in the RF modulator box... It probably uses a different capacitor (or a ceramic ressonator) to produce a different frequency of the sound carrier wave.

To change I to G, you need to open up 2 RFmod boxes and find the difference between them.

[TmEE]

be prepared to solder tiny valueless surface mounted capacitors....

[MEGADRIVE Jeroi]

That stuff is built in in the RF modulator box... It probably uses a different capacitor (or a ceramic ressonator) to produce a different frequency of the sound carrier wave.

To change I to G, you need to open up 2 RFmod boxes and find the difference between them.

Wel it cant be the swtich box.

As Mastersystem have only rf->rca cable, not switchbox, but audio is dissorted. It means Master system is sending Pal-I audio to the cable. So must be the MD1 also. I really think that MD1 switch box is only switchbox and dont contain any resistors or capasitors. The swtich box only changes line from wall or from MD1. MD2 switchbox is the newer version which does include some electric as it mixesis md2 to wall line so that both tv channel and md2 game is viewable by only switchin channel on tv with remote.

So this must be console transmitting different region sound channel. So what to solder on Master System and MD1 to make they change their RF region?

[Jorge Nuno]

The RF modulator is on the Megadrive's board under the aluminium heatsink.
It's not the external switch I'm talking about: that thing is just a switch.

[kool kitty89]

The RF modulator is on the Megadrive's board under the aluminium heatsink.
It's not the external switch I'm talking about: that thing is just a switch.

Yeah, only japanese MDs and Model 2 Genesis/MDs use external RF modulators. (plugging into the AV port)


Couldn't you sell it with simple composite AV cables, cheaper than SCART? (As long as the standard PAL color carrier is used, it should be fine, if audio is th eonly problem in RF, that would certainly solve it)

[MEGADRIVE Jeroi]

So nobody cannot provide any solder tips how to change the transmit level of PAL-I audio to PAL-G?

[kool kitty89]

I'd say just sell it with the common composite a/v cables, simplest thing to do and almost every TV will have composite inputs.
European TVs do have RCA inputs for composite video and audio, right? I mean, SCART isn't the only thing used for that, is it?

The amout of work needed to convert the RF adaptor doesn't seem worth it, and would almost definitely cost a lot more to have done than just buying an a/v cable. (even SCART)

[Telzzuni]

Hi! i have the same issue, i want to change the system pal I to pal g in my megadrive to have a good sound by rf...i have rgb cable but i want my console with all optmized...anyone find out how to do it? cheers

[TmEE]

You need to open up the RF box and adjust one of the variable coils, it will change the audio subcarrier freq... one changes video (don't touch that :P) one changes audio. Use non magnetic screwdriver to adjust it, otherwise you will have more trouble and can potentially ruin the core and end up with no sound at all.

[MEGADRIVE Jeroi]

You need to open up the RF box and adjust one of the variable coils, it will change the audio subcarrier freq... one changes video (don't touch that :P) one changes audio. Use non magnetic screwdriver to adjust it, otherwise you will have more trouble and can potentially ruin the core and end up with no sound at all.

First:
1. Turn Megadrive ON with game.
2. Tune your tv to right channel fregevency, to able to see Video
3. Turn Megadrive OFF.

Then:
1. Open megadrive.
2. Remove heat cover of rf modulator, that is located back on the megadrive and it have this kind of big silver metal cover and then the output pins.
3. Turn Megadrive while open state ON with game connected
4. Adjust smaller coil with non magnetic screw drives as told previous until you get the sound clear.
5. Reassemple megadrive.

Enjoy your PAL-whatever Mega Drive.

THO:
It seems that some Megadrive 1 only has 2 coils.

TMEE could explain where to find Audio Coil in rest Megadrive 1 models?

one of thees would be: Model 1600-05 november 91