rf modulator upgrade

[xerxies]

hi all, we recently upgraded to digital cams from analog, we have a nvisnano rf modulator that the manufacturer says will not work with digital...we only have a front door and back door cam, and atx the manufacturer quoted us 3,600.00 for a digital modulator...we canot afford that much, is there a cheaper way to feed this signal to all apartments...thankyou all for your help

 

[Phil]

If you used a standard 'decoder' (my preference would be from the same manufacturer as your IP cameras), then you should be able to output an TV signal, which you may then be able to input into your existing systems.