[Hackrf-dev] HackRF-dev Digest, Vol 70, Issue 14

Wed Jun 27 01:59:37 EDT 2018

Reply to message 1:

You can make a USB CABLE arrangement for external power supply to hackRF. 
You need to disconnect the power line from the USB Connector which can be 
fed to an external 5V

73
Tony
-----Original Message----- 
From: hackrf-dev-request at greatscottgadgets.com
Sent: Wednesday, June 27, 2018 10:58 AM
To: hackrf-dev at greatscottgadgets.com
Subject: HackRF-dev Digest, Vol 70, Issue 14

Send HackRF-dev mailing list submissions to
hackrf-dev at greatscottgadgets.com

To subscribe or unsubscribe via the World Wide Web, visit
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or, via email, send a message with subject or body 'help' to
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of HackRF-dev digest..."

Today's Topics:

   1. Re: HackRF-dev Digest, Vol 70, Issue 13 (william hatch)
   2. Re: Still hoping for PTT (Dominic Spill)
   3. Re: Still hoping for PTT (Gavin Jacobs)
   4. Re: Still hoping for PTT (Chuck McManis)
   5. Re: Still hoping for PTT (Dominic Spill)

----------------------------------------------------------------------

Message: 1
Date: Tue, 26 Jun 2018 13:53:03 +0000 (UTC)
From: william hatch <billhatch40 at yahoo.com>
To: <hackrf-dev at greatscottgadgets.com>
Subject: Re: [Hackrf-dev] HackRF-dev Digest, Vol 70, Issue 13
Message-ID: <831452034.2783240.1530021183863 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

Android phone/HackRF USB port experience
I have used the SDRTouch and RF analyzer to interface with the RTLSDR ($12 
analog TV tuner) and the HackRF. Both of these draw power heavily from the 
phone. For the SG3 and SG5 I replaced the stock batteries with heavy duty 
after market units available from Amazon. The SG3 had to be rooted to obtain 
permission to access the USB port. The SG5 may not have required rooting ... 
I forget & do not have current access to an SG35. I was able to access these 
radios with both of the above apps on an ASUS Zphone with the micro USB2 
interface, no rooting needed .. but the battery is not removable, thus no 
heavy duty battery replacement is possible for this phone.?

SDRTouch also works with the SdrPlay radio.

I tried to use a newer ASUS Zphone with the micro USB3 interface. This did 
not work immediately but I did not spend any more time with it.

In summary, If you want to use an SDR with an Android phone for anything 
more extensive than a ?quick look? an SG3 or SG5 with the heavy duty 
replacement battery will work well for you.
cell 240-702-5336

    On Tuesday, June 26, 2018, 1:28:29 AM EDT, 
<hackrf-dev-request at greatscottgadgets.com> wrote:

Send HackRF-dev mailing list submissions to
??? hackrf-dev at greatscottgadgets.com

To subscribe or unsubscribe via the World Wide Web, visit
??? https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
or, via email, send a message with subject or body 'help' to
??? hackrf-dev-request at greatscottgadgets.com

You can reach the person managing the list at
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of HackRF-dev digest..."

Today's Topics:

? 1. Re: HackRF-dev Digest, Vol 70, Issue 9 (Giuseppe Marullo)

----------------------------------------------------------------------

Message: 1
Date: Mon, 25 Jun 2018 14:31:01 +0200
From: Giuseppe Marullo <giuseppe at marullo.it>
To: hackrf-dev at greatscottgadgets.com
Subject: Re: [Hackrf-dev] HackRF-dev Digest, Vol 70, Issue 9
Message-ID: <7f342460-018e-7223-7988-b6960635880c at marullo.it>
Content-Type: text/plain; charset=utf-8; format=flowed

Ok,

>There is an android app called rf analyzer that will control a hackrf.

William, tanks for the suggestion. I just purchased the RfAnalyzer, it
seems to work on the S7. I was fearing no demodulation(just an
analyzer?) but it works, tested on a couple of repeaters and FM radio.

>I have used this app on an sg3 with >the after market heavy duty battery.

What did you use to inject power? Is there anything readily available? I
hate to mess with USB connector, probably the most unfriendly connector
for DIYers ever.

>The SdrTouch app might also work.
SdrTouch afaik does not support the hackrf.

In any case I am thinking to add a vanilla SDR stick to get full
duplex/double reception, and maybe easier reception with RPI for stuff
like DAB and ADS-B(not clear to me how difficult is to receive them with
a HackRf).

Thanks!

Giuseppe Marullo

IW2JWW - JN45RQ

------------------------------

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Message: 2
Date: Tue, 26 Jun 2018 10:58:53 -0600
From: Dominic Spill <dominicgs at gmail.com>
To: Gavin Jacobs <apriljunkbox at hotmail.com>
Cc: "hackrf-dev at greatscottgadgets.com"
<hackrf-dev at greatscottgadgets.com>
Subject: Re: [Hackrf-dev] Still hoping for PTT
Message-ID:
<CACX+tOafXBCRSjs__ES8_jbDKoMiZCNF=nNjjqTdMPh9w3LucQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

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
>
>
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Message: 3
Date: Tue, 26 Jun 2018 18:18:37 +0000
From: Gavin Jacobs <apriljunkbox at hotmail.com>
To: Dominic Spill <dominicgs at gmail.com>
Cc: "hackrf-dev at greatscottgadgets.com"
<hackrf-dev at greatscottgadgets.com>
Subject: Re: [Hackrf-dev] Still hoping for PTT
Message-ID:
<MWHPR2201MB13924EB9216CA31972CCAB74C6490 at MWHPR2201MB1392.namprd22.prod.outlook.com>

Content-Type: text/plain; charset="utf-8"

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<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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] On Behalf 
Of Gavin Jacobs
Sent: Saturday, June 09, 2018 5:57 PM
To: 
hackrf-dev at greatscottgadgets.com<mailto: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<mailto:HackRF-dev at greatscottgadgets.com>
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_______________________________________________
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HackRF-dev at greatscottgadgets.com<mailto:HackRF-dev at greatscottgadgets.com>
https://pairlist9.pair.net/mailman/listinfo/hackrf-dev

_______________________________________________
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Message: 4
Date: Tue, 26 Jun 2018 15:51:56 -0700
From: Chuck McManis <chuck.mcmanis at gmail.com>
To: apriljunkbox at hotmail.com
Cc: Dominic Spill <dominicgs at gmail.com>, Hackrf-dev
<hackrf-dev at greatscottgadgets.com>
Subject: Re: [Hackrf-dev] Still hoping for PTT
Message-ID:
<CAHTjPiqBNB7o-si6NAruMAZAatNjxn4rO5G9ocuYsG2ubxywnQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

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
>
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Message: 5
Date: Tue, 26 Jun 2018 17:40:51 -0600
From: Dominic Spill <dominicgs at gmail.com>
To: Chuck McManis <chuck.mcmanis at gmail.com>
Cc: Hackrf-dev <hackrf-dev at greatscottgadgets.com>
Subject: Re: [Hackrf-dev] Still hoping for PTT
Message-ID:
<CACX+tOag1fp=VjcouxeWFc1yOH_W8bcjj6oxMiAJMSpgKUS1mg at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

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
>>
>
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****************************************** 