First “picture” on the screen.

This weekend I connected a working game computer, the Conic TV-Tennis game, to my converter and see what’s happening. When I tuned the frequency on a Television I found a good picture on 178 Mhz. So I tuned around this frequency with my own build tuner to look for a good picture, but I only found a very fuzzy picture.

ConicYou see a sort of stripe which is the ball of the game. It isn’t a very good picture, but it’s a start. It is the first picture I get from the game computer.

So I started testing another game, the Radotin. On my Television I found the frequency of 55 Mhz, but on my Tuner I found nothing that I recognize. So I asked myself, what am I doing wrong ??

I studied the datasheet of the FL1216 and I looked at the setting of the steps I make to go through the frequency. I used steps of 50 kHz. I have some questions about these setting, so I tried to use some other settings. I start trying to use steps of 31,25 kHz, the slow-scan. Now I found nearby the frequency of 49,04 Mhz a reasonably recognizable picture of a nice game.


It is not very good, but it is reasonably recognizable as a game to play. When I study the results of the last experiments I think about the output signal of the FL1216 TV-Tuner. Are the levels Ok or are they wrong. When I connect the output of the FL1216 to a beamer with a RF-input I get a lot of time’s a kind off -out of Sync- error. What does this mean, I’m not a RF-mechanic and I don’t have a real scoop to control this kind of signals. I think there are 2 possibilities, OR the RF-level is to high, OR the RF-level is to low. The first possibilitie is easy to test, use an attenuator to bring the RF-level down. So I connected a potmeter at the output of the FL1216 to bring the signal down, but NO result. The next possibilitie is to use an amplifier, but I don’t have a RF-amplifier at my workshop.

My next goal is to check the RF-signal or find an adjustable RF-amplifier. So I’m going to search for a good scoop and a good adjustable RF-amplifier.



Author: avretro

I am a member of some section's of a computerclub in Holland, called the Hobby Computer Club or HCC. That section's are the Retro-, AI- and Robotica-section. Writing in Englische is not very easy for me, so don't blame me for it.

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