Like Herb is pointing out, one of the problems with stuff bought off the shelf (from DXE or others) is the lack of documentation. I have been waiting more than 3 years - so far without luck - for a real documentaione of the DXE NCC-1 which is a very good phasing unit but int the end one sertainly needs a good schematic if somthing goes wrong. So far they have failed to deliver. Len SM7BIC
I would avoid any attempts to do relay switching by supplying voltage down a coax cable but rather use two coax runs. The relay, blocking cap, diode and associated circuit in my case with two DXE boxes have deteriorate within less than a year to be useless, mostly due to electrolysis and zillions of ants attracted apparantly by the voltage or relay coil vibration when pulled in. (Yes I covered all the edges with silicon sealant) DXE refuses to send me a print to repair the board for what reason I don't know, thus making repair very difficult. They worked well when I got them but are useless today. Another disadvantage of having a blocking cap in the signal line is that you can not determine the coax run continuity through the windings of toroid back to the shack with a common VOM. This is an easy troubleshooting tool that is not possible via the DXE system. Herb, KV4FZ _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
