[Hackrf-dev] Still hoping for PTT

[Giuseppe Marullo]

Agreed,
But assuming the hw model could be disabled by a little switch you won't need any software change at all and retain bias ability for rx only applications.
If using software is that easy, then there should be no problem to activate bias and tx function at the same time.
I guess that not all the programs able to tx are able to do it, hence the idea to link the two together at hw level,  but maybe I didn't get the whole picture.

Still today is not clear to me how to drive in tx the hackrf looking at gnuradio example diagrams, go figure if I know how to sync the bias at the same time. 

On June 27, 2018 9:25:36 PM GMT+02:00, Chuck McManis <chuck.mcmanis at gmail.com> wrote:
>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
>> _______________________________________________
>> HackRF-dev mailing list
>> HackRF-dev at greatscottgadgets.com
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>>

-- 
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