American Fibertek Receiver Cards

[mikeald]

hi all,

I have a few american fibertek racks on my site, all with rr-20 cards in them. (dual channel receiver cards).

I have recently had a problem whereby a few of the cameras have started pulsing and flashing.

I have proved the fault to be faulty outputs on some of the cards.

I have got my scope out, and proved that on most of the cards the video output is giving me a good 1 volt signal, and of course a good picture.

However, if I plug the same fibre into one of my other cards, then the picture flashes and the video output signal jumps up to approx 2 volts!!!!

Sounds like the agc is naff.

Has anybody else had this experience?

Sounds like they need to get repaired to me though?

I also have a few rr20 m cards with the manual gain, which are fantastic, because I can simply tweak the pot until I have good picture.

Mike