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,
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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)
----------------------------------------------------------------------
Message: 1
Date: Thu, 21 Jun 2018 15:24:06 +0000
From: Gavin Jacobs <[email protected]>
To: "[email protected]"
<[email protected]>
Cc: Dana Shtun <[email protected]>
Subject: Re: [Hackrf-dev] Hack RF TX/RX switching
Message-ID:
<mwhpr2201mb139202c997dc750a3ca2f332c6...@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 <[email protected]>
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 <[email protected]>
To: [email protected]
Subject: [Hackrf-dev] HackRf+ArrowII antenna portable Satellite RX set
Message-ID: <[email protected]>
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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