[Hackrf-dev] HackRF-dev Digest, Vol 70, Issue 9

[william hatch]

There is an android app called rf analyzer that will control a hackrf. I have used this app on an sg3 with the after market heavy duty battery.  The SdrTouch app might also work.

cell 240-702-5336 

    On Friday, June 22, 2018, 1:28:36 AM EDT, hackrf-dev-request at greatscottgadgets.com <hackrf-dev-request at greatscottgadgets.com> wrote:  
 
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Today's Topics:

  1. Re: Hack RF  TX/RX switching (Gavin Jacobs)
  2. HackRf+ArrowII antenna portable Satellite RX set
      (Giuseppe Marullo)


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Message: 1
Date: Thu, 21 Jun 2018 15:24:06 +0000
From: Gavin Jacobs <apriljunkbox at hotmail.com>
To: "hackrf-dev at greatscottgadgets.com"
    <hackrf-dev at greatscottgadgets.com>
Cc: Dana Shtun <ve3dss at hotmail.com>
Subject: Re: [Hackrf-dev] Hack RF  TX/RX switching
Message-ID:
    <MWHPR2201MB139202C997DC750A3CA2F332C6760 at MWHPR2201MB1392.namprd22.prod.outlook.com>
    
Content-Type: text/plain; charset="windows-1252"

Dana,
For applications which require switching rx/tx, I use gnuradio, osmocom source/sink blocks, and the soapysdr-hackrf driver. As far as I know, this is the only combination that can switch rx/tx on the fly.

For 2m use, I have a homebrew power amp to boost the hackrf tx output, but I only want the power amp enabled when I am transmitting. I took the cover off the hackrf and soldered a 6 conductor ribbon cable to the unpopulated socket P5. You can see on the hackrf schematic that P5 has signal LED3 on pin 6 and GND on pin 1. LED3 is the same signal that drives the TX LED. It is 0V when the LED is off (rx mode) and 3.3V when the LED is on (tx mode). I then wired LED3 & to an input on my antenna controller (which is a PIC 18F2550). I put some logic in the firmware of the antenna controller such that when the hackrf is in tx, and the antenna controller is connected to the 2m yagi, and I have enabled what I call Pass-Through, then the antenna controller drives an output with a 2n3904 npn transistor to put the the power amp also in tx mode. So, I didn't use an opto as suggested by Bernie; I just directly tapped the signal that drives the tx LED.

I don't have a schematic of the connection to P5, it's just GND and LED3 wired directly to a GPIO pin on the PIC controller.

Hope that helps!

Jake

________________________________
From: Dana Shtun <ve3dss at hotmail.com>
Sent: June 21, 2018 8:01 AM
To: Gavin Jacobs
Subject: Hack RF TX/RX switching

Gavin
Can you share your circuit? I?m in the same situation here re switching?
ie. anything special re opto? Is there enough current for the LED and to drive switching?

Also what software are you using?

Thx
Dana VE3DS
Toronto
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Message: 2
Date: Thu, 21 Jun 2018 18:55:54 +0200
From: Giuseppe Marullo <giuseppe at marullo.it>
To: hackrf-dev at greatscottgadgets.com
Subject: [Hackrf-dev] HackRf+ArrowII antenna portable Satellite RX set
Message-ID: <9e10ca98-6bf2-f2c9-3930-cb1ddb52bf34 at marullo.it>
Content-Type: text/plain; charset=utf-8; format=flowed

Hello,

just wondering if I could use a Samsung S7 to use the hackrf with 
satellites.

It is not clear to me which Android app could be used with hackrf for 
simple FM receive. Do I need drivers?

No Tx, no doppler correction no automagic frequency set, just plain rx.

TIA.

Giuseppe Marullo

IW2JWW - JN45RQ



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End of HackRF-dev Digest, Vol 70, Issue 9
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