The Rot2Prog rotor controller from AlfaSpid has four simple relays that several users has reported to be broken. This has also happened to me – I have a relay that has not function very well for several years. So I decided to try to replaced it.
These releay are very cheap and I found replacement at TME:
RM85-2011-35-1012 Relay:electromagnetic;SPDT;Ucoi l:12VDC;16A/250VAC;16A/24VDC ROHS Przekaźnik:elektromagnetyczny;SPDT;Ucewki :12VDC;16A/250VAC Mfr: RELPOL Original part number: RM85-2011-35-1012
First remove the top cover by removing the four screws at the side of the chassi. Then remove the two screws holding the board, see image below:
The board is built nice, with ferrite on the input and output cable to prevent RF-noice. If needed to change the board, this can be easy done.
Then desolder the faulty relay. For me, it was one of the azimut direction relay, the one to the left:
It was a pain in the *** to desolder and remove this relay! I was close to give up and nearly destroyed the board. But finally, after two hours, I did managed to remove it. I can not understand why AlfaSpid did not mount a relay socket for easy change…
Solder the new relay
This was an easy task, just solder the 8 legs:
Now connect all the cables and try it. Hopefully it will now work again!
My setup for amateur radio satellites is SDR for receiving (RX) and Icom IC-705 for transmitting (TX). To my antennas I have two separate coax feedlines. Before, when switching band between RX and TX I was forced to manually change the coax feedlines connectors between SDR and IC-705.
I started to plan a simple relay switch to be able to switch fast and easy between TX/RX and UHF/VHF antenna – I call this a ”Simple full duplex relay switch”. The plan was this:
When no power to the relays the SDR is connected to the UHF antennas and IC-705 connected to the VHF antennas.
When 12V power to the relays the SDR is connected to the VHF antennas and IC-705 connected to the UHF antennas.
I got the PstRotator to work with OmniRig and IC-705 over WLAN. I’m using ”Icom Remote Utility” on Windows to set up the virtual COM-port. And I’m setting up OmniRig like this:
I had several problem getting the OmniRig to communicate with IC-705 via WLAN, but after re-installing to the OmniRig supplied with PstRotator (v1.18) I got it working OK. It is also working from SDR-Console V3.
So now it is possible to do doppler control of the IC-705 without any cables for true portable operations! See short video below:
Important update! When using automatic control from PC then both the elevation and azimut is controlled (moved) at the same time. It seems that the Dell power adapter can not handle the current amp spike and turns off (overload protection I guess). I have now return to using my 13.5 volt power supply.
I have been powering my Rot2Prog rotor controller for my RAS rotor with 13.5 volt. This means that the rotor turns slow. My 13.5 volt power supply also has a very high idle consumption of 10 watts.
I changed the power supply to a standard Dell power adapter – LA130PM121 19.5V 6.7A PA-1131-28D1 130W. It can be found very cheap. I just cut off the power plug and connected the wires from the Dell adapter to the Rot2Prog controller wires.
Now the turning goes MUCH faster! The Dell adapter also has a very low idle consumption – under 0.5 watt. So it can be connected all the time. What I can see there is no interference from the adapter on VHF and UHF.
I highly recommend using the Rot2Prog controller with an old computer adapter. Below is a short video of how fast it is turning.