yuandrew

1inxs

yuandrew, Welcome to the DTVUSA Forum. You did a nice job on the video. Here is a link to another thread in the forum with a Casio connected to a converter.
Handheld tv/ autoscan / no channel 3 or 4

Aaron62

Welcome to teh forum yuandrew.

Since you like tinkering around with electronics, you might want to check out the Seiko TV watch thread too: Converter for Seiko TV Watch (portable)

Wheezer

Hmm. The RF output on a these boxes is about 1 V peak-to-peak, right? My E&M is way too rusty to figure it out, but I wonder whether a "vertical" dipole cut to ~62 MHz from a piece of coax (where you roll the braid back along the cable) would work OK as a short-range transmit antenna.

Piggie

Don't insert anything larger than 18 gauge solid copper into the f connector or you will ruin it. 20 gauge is better.

The video out of the composite jack is 1 volt peak to peak into a 75 ohm load.
The signal out of the RF jack, assuming they are putting out about 0 dbm, would be about quarter of a volt into a 75 ohm load.

If you take 66 MHz to be the mid between ch 3 and 4, then you would cut a piece of wire 45 inches long and plug in the center you will have a Marconi quarter wave antenna. you could add a second wire hooked to the braid.

Moveover an easy way to build on is to remove 45 inches of the black outer jacket from a piece of coax with a connector on the other end. Then reverse the braid , folding it back so it goes about 45 inches down over the coax. Then just leave the insulation on the center conductor. You now have a dipole.

Or...................

Go by a cheap pair of rabbit ears with an f connector on one end and just plug a set of rabbit ears into the output. Pull out about 45 inches of whip. If the ears aren't that long put ball of aluminum foil on each end full extend.

I tried putting the output of a VCR into a large outdoor antenna and was able to receive it outside on a portable with a single rabbit ear for about 50 ft.

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I have an adapter. I bought it at radio shack years ago for my old portable to use with the car antenna. It went from female F to a main minature phone plug.

__________________
The more I understand, the less I know.

O-O

Welcome to the forum. Great video. Seems like it would be a pain in the rear keeping a steady supply of batteries to feed the converter and TV, but hey it works during an emergency.