[Hackrf-dev] Still hoping for PTT

[Dominic Spill]

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 <chuck.mcmanis at gmail.com> 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.
>
> On Tue, Jun 26, 2018 at 11:18 AM Gavin Jacobs <apriljunkbox at 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 <dominicgs at 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 <apriljunkbox at 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.mcmanis at 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 <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
>>>>
>>>> _______________________________________________
>>>> HackRF-dev mailing list
>>>> HackRF-dev at greatscottgadgets.com
>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>
>>>>
>>>> _______________________________________________
>>>> HackRF-dev mailing list
>>>> HackRF-dev at greatscottgadgets.com
>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>
>>>
>>> _______________________________________________
>>> HackRF-dev mailing list
>>> HackRF-dev at greatscottgadgets.com
>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>
>>>
>> _______________________________________________
>> HackRF-dev mailing list
>> HackRF-dev at greatscottgadgets.com
>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist9.pair.net/pipermail/hackrf-dev/attachments/20180626/fd79b415/attachment.html>