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 <apriljunk...@hotmail.com> wrote: > 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 energizes > whenever the Hackrf is in transmit mode. > > Jake > > > On Jun 26, 2018, at 10:59 AM, Dominic Spill <domini...@gmail.com> wrote: > > 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 <apriljunk...@hotmail.com> wrote: > >> 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 >> switching the power amp on and off just fine. >> >> Jake >> >> On Jun 19, 2018, at 7:02 PM, Chuck McManis <chuck.mcma...@gmail.com> >> wrote: >> >> 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) >> >> On Tue, Jun 19, 2018 at 5:04 PM Gavin Jacobs <apriljunk...@hotmail.com> >> wrote: >> >>> 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 <bernardkob...@tpg.com.au> >>> wrote: >>> >>> I admit I have not tried this but what about using the TX LED to drive >>> an optocoupler to switch the amp? >>> >>> Bernie >>> >>> >>> >>> On 11 Jun 2018, at 00:53, CJ Hicks <cjhi...@dadelus-engineering.com> >>> wrote: >>> >>> Why not leave your exciter on and only PTT your power amplifier (PA)? >>> Or use an RF to shunt your exciter signal into a dummy load. Just a couple >>> of random thoughts. >>> >>> CJH >>> >>> *From:* HackRF-dev [mailto:hackrf-dev-boun...@greatscottgadgets.com >>> <hackrf-dev-boun...@greatscottgadgets.com>] *On Behalf Of *Gavin Jacobs >>> *Sent:* Saturday, June 09, 2018 5:57 PM >>> *To:* hackrf-dev@greatscottgadgets.com >>> *Subject:* [Hackrf-dev] Still hoping for PTT >>> >>> Has there been any progress on implementing digital i/o from/to the >>> hackrf One. I'm hoping that someday the hackrf can supply a PTT signal to >>> an external amplifier. >>> >>> Jake >>> >>> _______________________________________________ >>> HackRF-dev mailing list >>> HackRF-dev@greatscottgadgets.com >>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>> >>> >>> _______________________________________________ >>> HackRF-dev mailing list >>> HackRF-dev@greatscottgadgets.com >>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>> >> >> _______________________________________________ >> HackRF-dev mailing list >> HackRF-dev@greatscottgadgets.com >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> >> > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >
_______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev