[Hackrf-dev] Still hoping for PTT

[Chuck McManis]

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 <apriljunkbox at 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 <bernardkobier at 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 <cjhicks at 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-bounces at greatscottgadgets.com
> <hackrf-dev-bounces at greatscottgadgets.com>] *On Behalf Of *Gavin Jacobs
> *Sent:* Saturday, June 09, 2018 5:57 PM
> *To:* hackrf-dev at 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
>
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