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: