I thought I read it somewhere too - 7 receivers for each transmitter ... but maybe I'm thinking of color groups.Where did you read about the 7 receiver limit? There are 7 frequency groups, but I haven't see a 7 receiver limit.
Regardless, the manual (https://cdn.shopify.com/s/files/1/1384/9629/files/donner_wireless_-dmx512_user_manual.pdf) says 'One transmitter can be used with unlimited receivers '
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