Архив за 03.01.2018

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Antennas • Re: Low Frequency Antenna

Coax is very simple, it's just two wires, the inner wire and the shield. Solder the red wire to the inner wire, and the black wire to the shield.

Not sure what the white header is called, but its a very typical probably 2.57mm header. There's no adapters for that to SMA as far as I know. You'd have to rig up your own PCB to create an adapter.

Antennas are tuned for a specific frequency range, but that doesn't mean that they won't pick up stuff outside the range, especially if the signal is close and strong.

For the keyfob, I guess the car excites the RFID part with it's own transmitter. So if you want to investigate the RFID part you'll also need some way to excite the RFID yourself if doing it outside of the car. Either that or just bring the keyfob to the car. The battery is probably for the buttons on the remote which work with a different signal.
evelyette wrote:
Wed Jan 03, 2018 10:45 am
rtlsdrblog wrote:
Wed Jan 03, 2018 5:23 am
1A. Yes you can use either of those antennas, and the red thing is the antenna.

Preferably I would like to solder the wires inside the cable to some kind of connector in order to connect to the WHITE connector of the antenna as presented here - so I can easily connect/disconnect the antenna without statically soldering it together. Any ideas how that white connector is called, so I can search for it on ebay?


1B. You'll still need to solder it to an SMA connector though.

Is there any sketch anywhere about how to solder the SMA-male to the connector of the antenna. I've ordered this https://www.ebay.co.uk/itm/162699354838 cable and I plan to cut the cable in half, but afterwards I'm not sure how many wires are inside or how to solder them onto the antenna.

2. Yes if the frequencies are different the Android reader wont pick it up as whatever chip is inside is not designed to receive the lower frequency.

Yes this is the case as specified here: https://news.samsung.com/global/everyth ... newest-nfc - it only supports 13.56MHz.

3. You'll need an antenna for sure. But if the keyfob is close enough to the HackRF then even the standard whip antenna included with the HackRF might be able to pick it up.

How is HackRF operating at 1MHz - 6GHz and standard antenna operating at 75MHz-1GHz able to pick up a signal being set at 125kHz. The frequencies of the HackRF or the antenna don't support it?

4. Had a quick read, it says "The Security Transponder derives its power supply from the magnetic field (LF field) established by the basestation. No additional battery supply is needed. Data is transmitted by modulating the LF field."

Does this mean the transponder is a passive RFID, which gets energy from the car RFID counterpart? As such, the battery in the car key is needed only to calculate whatever the key is supposed to do, but the energy for the actual transmission of data comes from the car itself?

Statistics: Posted by rtlsdrblog — Wed Jan 03, 2018 11:09 pm

Troubleshooting Help • Re: Another Stopped Dongle with a twist

Faulty units are extremely rare, and in 99% of all the cases reports about a faulty dongle are actually just Windows software issues.

Most likely Windows overwrote your drivers during an update or via automatic windows updates. Rerun zadig and reinstall the drivers. And then disable automatic windows driver updates.

Statistics: Posted by rtlsdrblog — Wed Jan 03, 2018 11:03 pm

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RTL-SDR Discussion • Re: rtl-sdr CHEAP

Definitely a scam. We've already had several customers come back to us and say that they bought from that listing or a similar listing and eBay already refunded them.

We've also been in contact with eBay and they're investigating the guy and they've got a case with the police in the scammers country. Apparently they're close to shutting it down and similar scammers too.

He's a serial scammer on eBay doing this with multiple accounts.

Statistics: Posted by rtlsdrblog — Wed Jan 03, 2018 10:49 pm

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RTL-SDR Discussion • Re: rtl-sdr CHEAP

NOt a scam as far as I can tell, I have one already and am purchasing a second one.. Maybe they are stolen (that a joke) :lol: but worst on worst is--- well there is not a bad side,, I spent 10.29 for one and works great, if for some reason I don't get the second one -- lets see I get my $10.29 back, or if it doesn't work, I get my money back and get to keep it (my credit card policy is if its not what you ordered you get a full refund from CC company and you get to keep what they did send you.. I don't know how you can loose.. I'll let you know in a couple of weeks.. think it says he has 10 left but by then they will be gone.. Or maybe I should buy them all and resell !!! ( if you do buy do not depend on Ebay or PayPal to help you, that IS a joke !! :shock:

Statistics: Posted by radiowaz — Wed Jan 03, 2018 10:19 pm

Other SDR Devices • Airspy HF+ on a Raspberry Pi?

Has anyone got an Airspy HF+ working on a Raspberry Pi?

I can compile and run SDR applications that link to libairspyhf on macOS. And libairspyhf builds and links without error on my Raspberry Pi 3. But the same code that runs on my Mac, reports no Airspy HF+ devices found on the Raspberry Pi.

The code I am developing emulates the rtl_tcp protocol when used with an HF+. That allows me to stream HF+ data from my Mac to any SDR application which can connect to the rtl_tcp protocol at a sample rate of 768 kHz. I would also like to run that server on my Raspberry Pi.

Statistics: Posted by hotpaw2 — Wed Jan 03, 2018 9:36 pm

Comment on Turning an old Radiosonde into an Active L-Band Antenna by anon

Any idea if the modification would be similar for the Radiosonde Rs 80-15 N?

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