LabGuy's World: Goldmark 1 Project - Getting started

       PART TWO: If CBS stopped broadcasting this format over sixty years ago, where will we find a source of the CBS field sequential color signal and a compatible CRT monitor for our project? Never fear! There is always a way...

The [Aurora Design] World Converter Model WC-01

       Fortunately, there is a huge interest today in obsolete television standards. Antique television collectors especially need a source of multiple obsolete video standards in order to display the TV sets in their collections. Fortunately for us, [Aurora Design] manufactures a series of TV scan converters that accept modern SD formats, NTSC, PAL, SECAM and convert them to dozens of obsolete standards. These range from 30 line Baird Televisor video all the way through to the 405/72i CBS format! Not cheap at just over one thousand dollars for the full featured model. But, Labguy only uses the best avaialable equipment. OK, this is the ONLY available product for this purpose. Read about the AMAZING Aurora Design [World Converter WC-01] here. There is also a line of single standard converters at much lower prices than the WC-01.

Labguy first chooses the Akai VM-100 three inch BW CRT monitor

       To make this project as compact as possible, it must use the smallest practical video monitor available. My first choice was the Akai VM-100 side car monitor, an accesory to the quarter inch video tape recorders made by Akai in the early 1970s. It has a three inch screen and uses very little power. In fact, this monitor's design was modified slightly and adapted to fly on Apollo moon missions that used a field sequential color video camera! I ultimately chose this one first because it was in my junk box. For free.

       In the end, the Akai monitor failed to be adaptable to the CBS horizontal scan rate of 29.16 KHz. That is almost double the standard scan rate of 15.75 KHz.

Labguy's second choice. The Sony / Tektronix 308 three inch BW CRT monitor

       Take two. A video monitor salvaged from a professional digial logic analyzer. It is slightly larger at three and a half inches diagonal. This monitor was made by Sony for Tektronix. I received the analyzer with the full service manual and the full theory of operation! This video monitor required separate video, horizontal sync and vertical sync inputs. Making the job of integration a whole lot simpler! The simplicty of the both scan circuits made me confident it could be adapted. In the end, this proved to be correct... More about that on the Goldmark 1 system theory of operation page.


Created: July 3, 2013, Last updated: February 24, 2014