Search found 7 matches

by RChadwick
Mon Sep 30, 2019 11:48 am
Forum: Other SDR Devices
Topic: Changing the HackRF's Bias-T Voltage
Replies: 2
Views: 390

Re: Changing the HackRF's Bias-T Voltage

Thanks for the response!
That makes sense about the 500mA from the USB port. I modified my HackRF/Portapack to have an internal battery, and used a DC Step-up regulator that can handle 2A.
by RChadwick
Sun Sep 29, 2019 3:47 pm
Forum: Other SDR Devices
Topic: Changing the HackRF's Bias-T Voltage
Replies: 2
Views: 390

Changing the HackRF's Bias-T Voltage

It looks like the antenna Bias voltage for the HackRF is 3.3v at very low current (Q4 and L3 are rated for under 200mA), but all the amplifiers I want to use are 5v, and TX amplifiers often want more current. Does anyone know why 3.3v was chosen for the bias voltage? If I were to replace Q4 and L13 ...
by RChadwick
Sat Sep 07, 2019 8:13 pm
Forum: Other SDR Devices
Topic: Powering a HackRF Portapack
Replies: 5
Views: 1735

Re: Powering a HackRF Portapack

That looks awesome! I pretty much just finished my version of this, with using the reset button to start up and shut down. Where is this version available? Is that a bigger display?
by RChadwick
Tue Aug 06, 2019 4:03 am
Forum: Other SDR Devices
Topic: Powering a HackRF Portapack
Replies: 5
Views: 1735

Re: Powering a HackRF Portapack

Thanks for the response. I saw that link, but the person had sparse details about the DC-DC. I suppose I'll go with the best DC-DC I have. Thanks!
by RChadwick
Sun Aug 04, 2019 4:45 pm
Forum: Other SDR Devices
Topic: Powering a HackRF Portapack
Replies: 5
Views: 1735

Powering a HackRF Portapack

I'm looking to put in a Li-Ion battery into my Portapack. I'm going to need a DC-DC Boost regulator to get the +5V, which is going to be noisy. How big of a deal is it? I see a switcher on the HackRF schematic, so maybe not so bad? I could go nutty, and feed 6V into a 7805, or go extra nutty with 5....
by RChadwick
Tue Feb 13, 2018 7:06 am
Forum: Other SDR Devices
Topic: Replacing the LNA/PA in the HackRF
Replies: 1
Views: 2475

Replacing the LNA/PA in the HackRF

Looking at the schematic, it appears the HackRF uses a MGA-81563 for the LNA and PA. As these appear to be EOL, and there appear to be many complaints about the RX performance of the HackRF, has anyone replaced these with something better? While I haven't yet looked closely at datasheets to check co...
by RChadwick
Wed May 11, 2016 1:39 am
Forum: RTL-SDR Discussion
Topic: SDR with ATSC tuner
Replies: 1
Views: 4763

SDR with ATSC tuner

I came across this cute little ATSC dongle: http://www.ebay.com/itm/Good-Quality-Mi ... 2026005038

In addition to fitting an Android phone, it's ATSC instead of DVB. Does anyone know what chipset this uses? Can it be used for SDR?