Are there any existing designs for a proper "simplex" Transmit/Receive switch between upconverter and downconverter based on PTT voltage on the coax (DB6NT style) ?
73
Are there any existing designs for a proper "simplex" Transmit/Receive switch between upconverter and downconverter based on PTT voltage on the coax (DB6NT style) ?
73
Yes, it's very simple
Remco , I Mean in terms of Isolation and switching time to prevent damage to the RX parts (ex limiting diodes and fast pin diodes)
I was just thinking of designing a simple sequencer PCB to drive relays and supply voltage to the PA after a small delay. There are many of these available already but either expensive or not quite what I want.
Another issue with the IC9700 not having separate band by band PTT signals I was considering if the External Preamp voltage could be put to use for this. Gated with another signal to ensure the PA is not permanently enabled when the radio is turned off or on another band. I can't think of a solution yet except perhaps pre-amp voltage lost and PTT enabled. Maybe something can be done via CIV.
Mike
G0MJW Mike take a look to PA3CSG page.. there you find what you need for low prices. He will send it usually out the next days.
Hope this helps you..
G0MJW Mike take a look to PA3CSG page.. there you find what you need for low prices. He will send it usually out the next days.
Hope this helps you..
Thanks - that's similar to the switch I was planning - but I am planning on my own PCB, why would't you when you can get 10 for $10!