Power Antenna Connection

[Ron H]

I installed a Hermosa retro radio last year working fine. Interesting to note for this discussion, two power sources were required one constant hot and 2nd ignition or key activated. As part of my resto decided to install a power antenna. As assume is usual you have three wires for the power antenna one being ground. As this is a switch-less unit the radio lead powers the antenna up; but it won't retract unless I cross both the red and green wires as this antenna is equipped. I understand a constant hot source is necessary to power the antenna back down. My assumption though was that since the radio already has two power sources, this would be already supplied power to both raise and lower it. Not the case, it will raise; but not lower until I use a jumper connecting both wires from the antenna. Unfortunately Hermosa makes no mention of power antenna hook up beyond saying there's a power antenna connection/wire in their 40 page instruction manual. So it seems to me I'd need yet another hot feed (constant) to supply voltage to antenna to lower it? I've sent them (Hermosa) a message waiting on their response. If anyone knows what's necessary or have been through this before appreciate any advice.

 

[Ron H]

The service center said good question but couldn't offer an answer directing to another center. This isn't rocket science but my thought was since this radio required two power sources already there would be a power source to retract antenna rather than adding another source. So I made another power connection at the fuse box and it works as it should. I'm adding a fused wire as a precaution..

 

[Nacho-RT74]

fully automatic powered antennas get a Batt ( or keyed ) source to the antenna motor itself, the remote signal from radio which is just a trigger and the ground. While the trigger is being feeded, the antenna will keep extended. Once the remote is off ( radio turned off ), they antenna will retract with the same power was extended WHICH IS NOT THE REMOTE/TRIGGER signal.

there are some other antennas which are semiautomatic, and they work with a separated switch sourced from batt/key, but not triggered from radio