I've got a US Tower MA-770MDP on order with the RMC-1000 remote. I want to prewire my shack before the tower arrives. Does anyone know the specifics of the required cable - how many conductors and si
Howard, The cable should be 8 conductors, and depending on cable run, 14ga or 16ga. There is no large current traveling in the conductors, mainly control signals. I have a 40 year old MA770 in the ai
Ray, Thanks very much. I guess that rotor cable would be too lightweight? I know that this tower design has been around a long time - I didn't realize 40 years. The winds are mostly gentle in my area
Mike - good to know! So I probably should not be running the RMC-1000 cable in a 3" PVC pipe alongside my coax, Steppir and rotor cables into a single NEMA box on the outside of my shack wall? That i
Good news on the cable. I just heard back from Remi the engineer at US Tower. He states, "The cable needed for the RMC1000 is a 7~8 conductors #22. It does not carry 120V. It can run in the same cond
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Thu, 6 Nov 2014 19:51:04 +0000 (UTC)
Howard, I am not an expert on the Electrical Code, but I think the requirements are relaxed with "plug in" devices such as the RMC-1000. Since I devoted a conduit to the motor power, it seemed appro
Remi just revised his response to me after 5 minutes :) He wrote, "I stand corrected, the cable do carry 120 volts, and should be #20 7 or 8 conductors. It only carries the signals for the relays, so
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Thu, 6 Nov 2014 20:17:30 +0000 (UTC)
Evidently they have redesigned the RMC-1000 since mine was built 10 years ago. Mine definitely uses 120V on the control lines. I had considered reworking it for 24V but didn't, I guess they did! -M
Author: KJ6Y--- via TowerTalk <towertalk@contesting.com>
Date: Thu, 6 Nov 2014 16:23:39 -0500
US Tower remotes and the old Tristao use 120 v to control the relays. If you have a Tri-Ex remote, they used 26 volts to control the relays. Standard rotor cable will do fine. Only use 7 conductors.
Sorry, that's a wrong answer. If the cables carry 120VAC, they MUST NOT be in the same conduit with low voltage wiring. As I recall, the break point is something like 48V. 73, Jim K9YC ______________
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Thu, 6 Nov 2014 23:35:40 +0000 (UTC)
And even though the RMC-1000 switch is turned off, line noise can still propagate along the line, so for several reasons it is prudent to separate signal and control lines.-Mike From: Jim Brown <jim@
He wrote, "I stand corrected, the cable do carry 120 volts, and should be #20 7 or 8 conductors. It only carries the signals for the relays, so no high amperage. And there is no voltage when the cont
On 11/6/2014 6:28 PM, Jim Brown wrote: On Thu,11/6/2014 11:55 AM, Howard W6HDG wrote: I then emailed him again and double checked that it could run in the same conduit with coax and rotor cables and
Ray, I just joined the list today so hope I am responding properly. Thanks for the pics. Are your MARB and MAF parts from 40 years ago as well? They look brand new. Very nice job on your base. I'm in
Ray, I just joined the list today so hope I am responding properly. Thanks for the pics. Are your MARB and MAF parts from 40 years ago as well? They look brand new. Very nice job on your base. I'm in
I have the same tower and remote package. Jim is correct. The controller uses 120VAC and it would be a code violation to run it in the same conduit as low voltage cables. Period. It's irrelevant that