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
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
> 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
It's possible that we could add an option for this, but I wouldn't want to
make it the default because there are times when we don't want to turn it
off when switching back to RX mode.
Dominic
On 26 June 2018 at 16:51, Chuck McManis wrote:
> Or to put it differently, :-) If the HackRF would
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.
On Tue, Jun 26, 2018 at 11:18 AM Gavin Jacobs
wrote:
> Dominic
> Thanks for that offer/suggestion, but it’s already done! I found the TX
> mode signal that
Dominic
Thanks for that offer/suggestion, but it’s already done! I found the TX mode
signal that drives the TX LED, and it was already brought out to P5. So All I
had to do was solder some ribbon cable to P5 socket (which is not populated). I
have it connected to my power amp such that it
I'm not certain, because I don't want to break portapack or other add on
boards, but it may be possible for us to toggle a GPIO pin on one of the
headers when we switch to TX mode, if that would help?
Dominic
On 20 June 2018 at 17:55, Gavin Jacobs wrote:
> Chuck,
> I have used the bias-t
Chuck,
I have used the bias-t voltage on the hackrf to power an upconverter but it
isn’t easy to turn it on and off. The only method I know is to use
hackrf-transfer - but that doesn’t work when switching to/from rx & tx.
Meanwhile I have brought the tx LED signal out from P5, and it is
FWIW the idiomatic way to achieve this as far as I can tell is to send a
bias-T signal on the RF cable, basically its a DC offset on the cable which
the PA picks up and switches on. This lets you have short cables between
the PA and the antenna and its only one line to hook up (the antenna coax)
Bernie
That’s a great idea! I looked on the hackrf schematic and the signal for the TX
LED is brought out to a (DNP) header - all I have todo is bring that signal out
to my PTT circuit. Thanks for the suggestion!
Jake
On Jun 15, 2018, at 5:32 AM, Bernard Kobier
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