Total posts : 45366
Neil, I’m really hesitant to add synching because it’s such a can of worms. I could add RS485 master/slave circuitry but then you have to fiddle with delays to get everything just right. I have not tried any of this, but I cannot imagine that 2 transmitters separated by a fair distance would have the issues that the plot showed earlier. If I was doing a large area, I would still consider separate transmitters servicing select areas of higher density listeners running off Exstreamers via the Internet. This way, everything is straightforward; there are delays but no one would notice and the frequency would stay the same. True, some listeners would not get service.
For TalkingSign I got FCC and Industry Canada approvals. The tests involved intentional and unintentional emissions, and conducted emissions (through the AC adapter – which for AM at these low frequencies is hard to suppress). It cost about CDN$6K back in 2000. With a non-detachable antenna added, they would have to do an open field test which would add even more cost 🙁
Gerry
