[Skimmertalk] A balanced Red-Pitaya-RBN-Station

[N4ZR]

For what it is worth, Saki, I have used the QS1R with the Clifton Labs 
active antenna and 1 KW for several years.  I discovered that 
byinterrupting the DC to the active antennaand opening (not shorting) 
the antenna input before the preamp, I was able to eliminate spurious 
spots.  However, my active antenna was about 50 meters from the 
transmitting antennas.

An important point - the Clifton antenna has a relay that opens the 
circuit to the whip when the DC is interrupted.  I suspect that is a 
necessary thing, and if your active whip does not have it you may want 
to add one.

73, Pete N4ZR
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On 11/27/2017 5:58 AM, dd5xx at web.de wrote:
> The Mini-Whip uses a kind of diplexer where it is fed with 12V DC, the power is supplied through the coaxial cable to the active antenna element. Would it be enough to implement a TX/RX relay that will power off (drop the 12V power supply for the mini whip) at the moment I am transmitting with my amateur radio station? Should I additionally protect the Red Pitaya input during a TX session just like HB9JCB described in his last post?