Jack in the Box intercoms was in my past as a youth experimenting with radios.
So, we've silenced two more of them within one day today. I just came back from a really quick hunt where the homeowner thought it was pretty cool when our motley crew of radio operators came to his door and explained the situation. In this instance we didn't make him silence the intercom for good, but just change the channel. I'll explain why.
Our first hunt this morning led to the homeowner simply surrendering his intercoms to us for experimentation, for which he was compensated for the intercoms and the time he spent patiently listening to our story. One of the members of our group spent the day going over the devices and learning how they function. He discovered that they are operating normally, however, the are defaulted to channel 1 (467.625) right out of the box. He found that people may try to change the channel, but unless they hold the channel button until it beeps, it will always revert to channel 1. So, we can allow the people to keep using them, but did counsel them about the harm it causes when it's on channel 1. It also really opens their eyes when you produce an HT to them that is clearly listening to the inside of their homes. I think this way compliance is better earned when we dont ask that they stop using their purchase altogether.
The other cool discovery we made is that you can talk through the offending intercom while it is transmitting. We tested the group all call frequency (467.6125 726DPL) and we could be heard over the speaker while it's transmitting. For the next one I set my HT1250 up with the tx as the group channel and the rx as the channel 1 on the intercom. Just in case we encounter issues with users who are less than receptive to our requests.
Here is a link the the FCC documents attached to the ID on the devices we recovered today
https://apps.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=nvB%2FzJMsBLczLOxMcRfJRg%3D%3D&fcc_id=2AJEM-777&fbclid=IwAR1w5_mEog4yWe_3nPtQfvPNnWqK8xVgG7ISNkwO89zD1LIS0sCwQmbKwvY