Edilock Ltd company specialize in developing of car diagnostics software, key programming and immobiliser pin code reading devices, odometer correction software and devices for bypassing the immobilizer of petrol and diesel cars from VAG Group. This tool is specialy designed to open the door locks and ignition lock of different vehicles in non destructive way. In 2014 we purchased a HACKRF One SDR radio and quickly found that the receiver was being swamped with local interference from nearby transmitters and other equipment.
After looking for a suitable metal case to screen the entire board we found a post on The Grymoire blog which explained how to use a Hammond 1455J1201 case to shield the SDR radio.
A template for the case ends was available online from Stefano Probst who had provided the file in SVG format.
We printed the template onto a A4 sheet of self-adhesive label paper and cut out the drill guides and fitted them onto the metal end plates from the case.
Each end plate was then fitted into our CNC mill and using the manual controls we pre drilled each hole with a centre drill then drilled each of the larger sizes.
After drilling the end plates, we had to clean the holes with a deburring tool and removed the sticky labels and cleaned off the adhesive residue with a solvent clearer.
The HackRF circuit board was then removed from its plastic case and slid into the rails on the new Hammond case. Each of the drilled end plates was then fitted to the case and the RF connectors fitted using the original nuts and washers.
The links below show the screen shots of the SDR software before and after fitting the case. In September 2014 I pre ordered a HackRF One SDR radio from Passion Radio Shop and on the 13th March 2015 it arrived! Initial testing with the HackRF showed that it was being swamped with external RF from nearby transmitters.
Installing the kit was very straightforward and after carefully opening the plastic case we soldered the RF shield outside frame to the pads on the PCB and then fitted the RF shield top. The kit also included a ground clip test point which was soldered to the top of the PCB on the pad provided and also a 20 position female header which fits in the P30 location on the board.
After fitting the shield we tried various frequencies to see if the noise floor was any lower but this didn’t appear to be different to when the shield was not fitted.
In the air band frequencies there was a small improvement on reception from the local airport (Bournemouth) but on the 70cm ham band (430Mhz to 440Mhz the interference from other local transmitters seemed to be the same. We are now planning to make a custom metal case and a low noise switchable preamplifier for the HackRF One to replace the plastic case and we hope that the metal enclosure and preamp will improve the reception and external EMI noise issues. We recently purchased a pair of Specialized Crux E5 cyclocross bikes from Primera Sports in Bournemouth which we plan to use for longer road rides and some off road and keep our full suspension mountain bikes for just off road rides.
We purchased Cateye Micro Wireless bike computers (model CC-MC200W) to use on the bikes as they are a nice and compact computer and have enough functionality for our needs to keep track of speed and the distance of the rides. The new computers seemed to be working without any problems until we came to switch on our LED Moon NOVA 80 lights and then the signal from the bike computers sender unit stopped reaching the Cateye computer and the display showed that no signal was being received. When we returned home we experimented with different locations of the LED lights and also the bike computer and the computer would work with the LED lights running but only if the light and the computer was separated by over one meter.
In order to try to resolve these problem and find which frequencies are being used, we wrapped a wire around the sender on the bike computer to act as antenna and connected this to our scope.
We then wrapped a length of wire around the Moon Nova 80 LED headlight to capture the RF being emitted by the light and when connected to our spectrum analyser there was a general increase in RF noise between 0Hz and 10Mhz. Connecting this to the scope showed several different spot frequencies being generated with a strong pulsing signal at 7.8kHz as shown on the screen shot below.


We then tried our more powerful SolarStorm LED headlights with have two CREE led units and found that the power cable was radiating a signal with a large primary pulse and a smaller secondary pulse at 49.3 KHz. In order to test if it was a spot frequency or wideband noise causing the Cateye computers to fail we used our frequency generator with signals from 1 kHz to 100 kHz into an antenna near the bike computer but this didn’t stop the senders signal from reaching the bike computer.
After searching for this problem online there are a lot of other posts on cycling forums relating to the Cateye wireless computers and LED lights.
Following from the Mastervolt Soladin 600 Inverter RF Interference post about the major RF interference problems generated by the Mastervolt Soladin 600 tie-in mains inverter we have now resolved the RF interference by replacing the unscreened and unearthed plastic case on the inverter with an earthed metal case and installed filters on the DC input and AC outputs.
The Mastervolt Solardin inverter was housed in a plastic case and didn’t have any form of internal screening against RF interference being radiated from the unit so we thought that the best option would be to remove the circuit from the plastic case and install it in a metal box which could then be connected to the mains earth to limit any RF transmissions.
We fitted a mains RF filter onto the output between the inverter and the connection to the mains electric and fitted this into the base of the case. After fitting the new case on the wall and reconnecting the mains and solar DC input wires we ran tests using the Rigol Spectrum Analyser and found that the levels of RF interference had dropped from around -22db to -50db but when we moved the test antenna closer to the DC input wires we found that they were radiating a wide signal which peaked around 10Mhz with harmonics on higher frequencies. The output mains wires didn’t have this RF signal radiating so the source of the interference was now confirmed as the cables going to the solar panels from the inverter. With the metal case fitted there wasn’t any reduction in the  RF interference on my FTDX3000 so we had to find a way to block the RF from going back up the DC feed into the panels.
I ordered the filter which arrived today and after installing this we found a large improvement in the RF noise level but there was still a small signal radiating between the base of the inverter case and the filter inputs. After running tests on the spectrum analyser to get a background RF noise base level we turned on the inverter and DC from the solar panels and found that the background RF levels around the house didn’t change. I then tried all of the HF radio bands which had previously been unusable on my Yaesu FTDX3000 transceiver and found that the background noise and signal which was swamping the radio had gone! Hopefully the installation of the additional filters and installing the feed in inverter in a metal case will not cause us any further problems.
There are commercial Powerpole distribution boxes available but they are very expensive and difficult to obtain in the UK. We are considering making this board as a kit to sell on our AB Electronics UK website and would welcome any comments or feedback.
One of my hobbies is Amateur (Ham) radio and it is useful to be able to check the outputs on the radios transmitters to check that the signal is transmitting on the correct frequency and not causing spurious frequency problems. It isn’t safe to connect the output of a radio directly into a frequency counter or oscilloscope due to the high voltages and currents on the transmitter and so we needed a way to sample part of the transmitted signal while dumping the output into a 50 ohm dummy load resistor. After researching various options and commercial products we decided to build a variable RF signal sampler so we can use an attenuated signal from the radios main TX output. We built the sampler using a diecast aluminium enclosure,52x38x27mm RS Stock No 3439861 and used a pair of N connectors for the pass through port. The aluminium rod had a 6mm hole drilled down the middle and one end was threaded to accept a BNC socket. A short length of 2mm brass rod was trimmed on one end on the lathe to fit into the centre conductor of the BNC socket and this was then fitted into a piece of 6mm nylon rod which was then fitted into the 12mm aluminium rod. Initial tests with the 2mm rod conductor showed a very high attenuation of over -80db and this was too high to get reliable measurements.
An insulator was then fitted on the brass washer to stop both ends short circuiting and redirecting the RF power into the sample port. The attenuation with the adjustable section fully in varied between -20db to -31db and with the adjustable section fully retracted measured between -51db and -58.5db.
TC-5970D RF Shield Box provides both high RF isolation and room for testing medium to large size wireless device testing.


The device can also disable the alarm via OBD II which will allow you to perform the key programming. After you decode and open the lock then you can read the key combination from the tool and cut a key that will open and close the locks and will turn the ignition. If you require further details regarding the transaction data, please contact the supplier directly. We installed the optional HACKRF EMI Shield which helped to remove some of the interference but we still found that external noise was being received.
We loaded the file into Adobe Illustrator and reformatted the layout so it would print at the correct size and we also made a black sticker for each end with the labels in white text to go onto the finished case which is available to download in PDF format. Approximately one mile from my home is a large transmission array which has a local radio stations transmitter which is outputting 2000W and also a number of other emergency service and other private transmitters which are transmitting on a wide section of the RF spectrum. Turning off the LED lights restored the signal so there was a problem with the LED lights transmitting on a frequency close to or a harmonic of the wireless signal coming from the Cateye wheel sender unit which blocked the bike computer from receiving the senders signal. As this wasn’t possible on the handlebars we removed the computers and ordered a different brand of wired computer which runs without any problems regardless of the LED lights fitted on the handlebars. When passing the magnet past the sender unit a pulse was being generated at 19.16 kHz with a time period of approx. The signals being generated and leaked by the LED lights was not a “clean” signal and had a lot of harmonics and this must be causing the interference problems with the Cateye computers.
We don’t have any other brands of wireless bike computers to test so we don’t know if this a Cateye only problem.
This was making a large radiating panel on the roof and swamping my Yaesu FTDX3000 transceiver which has a long wire antenna attached near the solar panels.
To resolve this we installed a fine aluminium mesh behind the filter and inverters input cables and wrapped this around the cables creating a grounded faraday cage.
30 amps so we designed a double sided PCB with traces large enough to take the current load and fitted five of the Anderson Powerpole connectors to the board using 2mm round copper wire. We then fitted a M2.5 brass washer to the end of the adjustable section and a matching one on the cross bar between the two N connectors. TC-5970D RF Shield Box is an ideal test platform for Engineering, Manufacturing, or service due to it's ergonomic design.
In order to reduce these RF disturbances to the audio components, we design this RF shield Cap to cover the unused RCA port. With version 2.60 you will be able to copy the key of AUDI A6, A7, A8 and new Touareg when you have a working key and program direct our new key!This device is only available from EDILOCK Group Ltd. Then it will effectively decrease the RF disturbances to the signal input port and get the purer tone.
All customers can buy now only service key or complete Lock set with AUDI service key.Edilock Ltd. All customers who bought the device must update to V2.60 in order to use our new key AUDI SMART remote key!
If you are using our special AUDI key programming device then you can program the key on two times on two different cars!Ask for details.!!!



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Rubric: Electromagnetic Pulse Shield



Comments

  1. SCKORPION
    On a single street, 1 side college board.
  2. Admin_088
    Load, or you should appear into polish.
  3. BI_CO
    Have 7 days preparing for emergency scenarios exactly.