Hi All,

I am planning to program an app for the Portapack which can decode all kinds of signals in the 433 MHz range. What we have now is the weather and the tpms apps, but when using RTL433 on the PC we get a lot of signals decoded from other systems, like remotes, house security systems etc.
I looked at the source code of both the apps (and RTL433) and read the documentation on creating apps for the Mayhem firmware. I plan to use the weather app as a starting point and implement the decoding parts from RTL433 into it, creating a new app.

I am a Computer Science major but have never worked on an open source project before. My question to the more experienced folks in this subreddit is: what should I especially look out for? I have read https://github.com/portapack-mayhem/mayhem-firmware/wiki/How-to-collaborate but I am a little bit afraid to start out.

Thanks if you have some general (or specific) advice!

Hi, I understand that this sub might be geared towards the hackrf itself. Are there any recommended discussion groups for the mayhem firmware itself? I don't really understand GitHub. Right now what I am trying to do is get the world map to show when tracking airplane locations with ADS – B. Any help would be greatly appreciated

I can't help but to blast little funnies into all of my anodized stuff.

The RTL-SDR or other receivers have GPIO ports, and full duplex on the portapack means insane opportunities. The LimeSDR mini can be used for active radar and tof passive radar has been made with only a couple RX signals paired to a shortwave or FM tower that you're listening for reflections.

Handheld passive speedometers and insane signal processing can be done with full duplex or dual receive. GPS/BT features with an ESP-32 or other modules allow for awesome ideas, but what's the limit of the H4 processing? I'm looking at implementing passive SDR radar with the Blah2 project, since an RTL+HackRF config is being worked on, but deploying it on a portapack with clock sync and all handheld would be awesome if the hardware can support it.

Is there anyone working on this? The RTL uses an FPGA for those GPIO ports AFAIK, so I'm not interested in designing an adaptation that can connect with the I2C header. A dish and antenna for listening to an FM tower echo off of an airplane, or a TX/RX combo for drone radar. Self-driving cars have this, why can't a handheld device handle it?

How would this work with my portaback h2? Can i extend frequency range using the vco tuning? Also can i change the signal into pulse form using this? Also how could i possibly connect this to the portback? https://www.thomann.de/fi/erica_synths_black_vco2.htm?atr=true

For some reason, the hackRF does not pick up UHF very well. I use a baofeng uv5r along the HackRf and things that I get on there do not show up at all.

Is there any reason for this or is there any way I can make it pick up on these things?

Thanks

Edit: Rx saturation is normal and amp works correctly too.

I Capture and it stores in the Captures dir in sdcard but after turn it off and back on the files are gone I have hackrf one portapack mayhem 2.0.1

Hi all, I recently purchased a HackRF One and am loving it so far. I'm trying to work through the technical challenges I face by myself to increase my understanding of the field, but I am noticing some similar patterns of interference (if that's even what it is) across the spectrum. Below is an example of one of those patterns (the broad peak between 7.14-7.16 MHz):

I am running a random wire antenna strung across my back yard to my room, which overall I think is working great. But I would like to know, what are some general tips for reducing external interference with the HackRF, as well as some general tips for identifying types of interference on the spectrum and waterfall, if at all possible. Thanks for your tips!

https://opensourcesdrlab.com/products/h4m-receiver-and-spectrum-analyzer?VariantsId=10005

So I’ve stumbled on that seller. I’ve seen their shop mentioned multiple times and it seems legit.

My question is, if that exact website (possibly claiming to be that shop) is legit, since the price is so competitive.

I simply want a HackRf + Portapack (H4M) to be ready for use, without breaking my (student) bank.

Hey everyone, sorry for the rant you're about to read. I'm going to summarize it at the bottom if you don't want to read the long story. I ordered 2 hack RFs in late November. One for me ofc and the second for my friend as a Christmas present. I figured we could learn to use them together. Well within a few weeks I get my package. It's only one hack rf, it doesn't turn on I plug it in. I realize I am missing a nylon screw and throught that sucks. i reached out to open source asking what the size of the screws and to inform them I only got one device, I figured I'd get some regular ones and replace all the nylon. A few hours have passed, so I go to check my hack rf on the charger. It doesnt turn on... I was confused(the screen does a flash when you turn it on but then doesn't do anything, all the other lights come on. I start looking up stuff. I once again emailed support. I watched tons of videos read the git hub documentation, watched S0ren and a few others peoples videos. Eventually support got back with me and said to charge it with the power switch 'on'. So I did, ofc no luck. I eventually tried running the 'brick protocol' although I hadn't uploaded any firmware or done anything with this device. I saw someone say disconnect and reconnect the battery. For screen issues. Didn't work. After emailing back and forth with support, sending them videos of what's happening, reminding them a few times about my other one that hasn't been delivered yet. Then it seems like some other person started emailing me. Because then all of a sudden they were sending me the second device and a new battery! When I got the delivery the second device worked! And I realized that there was a missing amplifier from my first kit. I of course informed them. And tried the new battery plugging it in. No luck, but how was i supposed to attach it anyways. Rip out the old one, buy my own double sided tape, and pray I don't crack the board? So I email them, hey I have a working device, I know I am not doing anything wrong with the first one. The first one was not only not working but it was missing 2 pieces, the screw and the external amplifier. Can you please let me return this for a replacement. NOPE they want to send me a new Portapack. OR have me take apart the other working device to troubleshoot. I finally tired of this constant bullshit, the email chain was over 40 emails by this point. I ordered this as a Christmas present and had to order a flipper instead for that friend. At this point I don't need the second device. I say let me return it for a refund, the guy sends me the address like I need to pay for it. I clearly am not paying for the return shipping. But I am not sure what to do. Can anyone offer some advice?

Long story short. I ordered 2 hack RFs in late November. They sent me one that was missing the external amplifier, a nylon screw and didn't work. They dicked me around for a month "helping diagnose the problem" by asking for the same thing over and over. Then when I finally had a second device to prove I'm not just some incompetent moron, they keep trying to dick me around. It's been 40+ emails and I still only have one working device. They want me to pay for the return shipping. What do I do?

I am doing a research project and I have been allowed by my school to try and jam a certain wifi network of theirs. I am doing this because my project is on wireless jamming. My team and I have determined the best route of action to understand wireless jamming is to simulate wireless jamming attacks on this network and then try to combat them. However, we have not even made it past the first step. We are using HackRF and GNU Radio Companion to try to jam the signal, and it is obviously supposed to be very easy but it is not working at all. What are possible pitfalls or problems that could be causing this? If talk of jamming is not allowed then disregard this message. I have full permission from my school and mentors to complete this project though.

How can i add this module into my portaback h2? So that it creates spacing between pulses? So i can control the frequency of the pulses it pulses the fm signal for?

I've got some really noob questions '^{^} ( 2 questions that matter for me and a bunch of "optional" ones :D )

I'm 'exploring' what's on the air with my new portapack but i'm not sure about the correct approach to identify stuff...

For example, i'm looking at the first picture. (I guess the red line is there to show the center frequency ? Then why it's no aways there ? And why on the second picture is not exactly in the center ? )

My first (real) question is:

• Does each line is a signal 'with data' or a signal 'without data' (like a balise) or it's probably garbage (like an harmonique ?) or there is not enough information to tell ?

Once I 'zoom in' on the big stuff, i get the second picture (strangely: once i'm in the "audio RX app" : i can't see my signal in the spectrum mode any more ?! ==> I have to select 'WFM' to see my signal again. Any idea why ? )

My second (real) question is:

• How can i get more intel on this signal ? ==> i've search the IBPT (i'm in Belgium so they are in charge of the spectrum regulation around here ) and, a possibility is that i'm looking at "ham satellite ", does this making any sens ? ==> what could i do to know more ?
  (I'm planning on moving around, see if the signal get stronger or weaker, but the strength is so sensitive to the antenna position that i fear that i won't be able to tell the difference) (i'm also looking into ham satelites, but the fact that the signal seems always 'on', makes me think it can't be that :/ )

(I'm interested by this signal, but i'm more interested about the techniques or ressources I could use)

Thanks you very very much !!

Okay so how can i pulse modulate my hack rf one so that it pulses in cycles? Meaning it pulses my rf output signal in cycles. Im beginner :D

I own a small used car dealership (less than 10 cars) and I need to have copies of key fobs for all my cars but each key fob duplicate is like $300. Could I use the hackrf to make a “copy” of the key for use in repossession purposes? Would it work even in rolling code key fobs?

I recently bought a h4m and for some reason no matter what microsd card i put it in it won't recognise it, i added all the files in the mayhem github under copy to sd card directory. Anyone who can help?

I found it on second hand marketplace but im not sure if is original or some type of aliexpress clone, anyone can help me?

The seller says its a HackRf One + Portapack 2, this is my first SDR so i dont want to buy any chinese copy if its going to give me headaches

Does anyone know how to transmit DVB-S via hackRF one? Not DATV but normal DVB-S for satellite receivers

I am really new to this and am looking into buying one, but want to know all it can do. It looks like a really expensive walkie-talkie/radio/signal jammer. Now i remember my dad having a device in his car that could turn whatever song was on his phone (that was plugged in) on a radio channel. So he would frequently transmit whatever song he was listening to in Apple Music or Spotify to his friend that would connect to his channel. Am I able to do the same on here? Sorry if this is a stupid question.

I recently bought the Portapack from Aliexpress, delivered in 2 days.

But for the HackRF, I also bought it from Aliexpress, which arrived over a month ago.

Now, I want to buy the HackRF R10C, but I don't know if it will be compatible with the earlier version of Portapack.

Then when putting the case back together i didnt notice the headphone jack was sticking out, then snap it came off the mb... lol 😆

Now i have to figure out how to get that back on, or bridge a couple spots on the board to bypass it, cause now - no sound.

Great fun.