[Hackrf-dev] Still hoping for PTT

[Chuck McManis]

It is a bit more complicated Giuseppe than that. You see there are systems
which have active antennas (powered) for receiving. In such a system you
can use the antenna bias to provide power to the active antenna elements
(typically a filter bank and an LNA). Those are typically receive only
systems. Systems that have a dedicated transmit port can "hard code" the
bias-T on that port and switch on or off bias on the receive port. But if
you only have one port there are times when you want the bias on all the
time (operations with an active antenna) and times when you want it only
during transmit (PTT / bias-t applications). A software option that lets
you choose how it behaves is the best overall solution.

--Chuck

On Wed, Jun 27, 2018 at 3:13 AM Giuseppe Marullo <giuseppe at marullo.it>
wrote:

> > Or to put it differently, :-) If the HackRF would enable the ANT bias
> > when it was transmitting then it would "just work" as they say.
> Definitely I would vote for this. Maybe we could "link" the TX LED
> signal with the BIAS using a little hw "bridge" so not to rely on any
> sw change.
>
> Giuseppe Marullo
> IW2JWW - JN45RQ
> _______________________________________________
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> HackRF-dev at greatscottgadgets.com
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>
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