Proxmark3 community

k9

Contributor

Registered: 2016-08-18

Posts: 5

[solved] why the last firmware do not work well with hf antenna?

Hi,
Recently I update to last github firmware version on two pm3, and in both cases the hf antenna stopped working well. the voltage down to 5V and 0.7V, and the pm3 can't read the tag.

someone has any idea that is?

Last edited by k9 (2016-08-19 19:15:44)

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: [solved] why the last firmware do not work well with hf antenna?

Strange,  but did you update the bootrom first then the fullimage?

k9

Contributor

Registered: 2016-08-18

Posts: 5

Re: [solved] why the last firmware do not work well with hf antenna?

no, I update together in the same line:  sudo ./flasher -b ../../bootrom/obj/bootrom.elf ../../armsrc/obj/fullimage.elf
Is this incorrect?

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: [solved] why the last firmware do not work well with hf antenna?

what is the output from "hw ver" or when you start the proxmark client?
and would you post the "hw tune" output aswell?

k9

Contributor

Registered: 2016-08-18

Posts: 5

Re: [solved] why the last firmware do not work well with hf antenna?

proxmark3> hw ver
[[[ Cached information ]]]
         
Prox/RFID mark3 RFID instrument         
bootrom: /-suspect 2016-08-18 16:24:28
os: /-suspect 2016-08-18 16:25:05
LF FPGA image built for 2s30vq100 on 2015/03/06 at 07:38:04
HF FPGA image built for 2s30vq100 on 2015/11/ 2 at  9: 8: 8
         
uC: AT91SAM7S256 Rev B         
Embedded Processor: ARM7TDMI         
Nonvolatile Program Memory Size: 256K bytes. Used: 185123 bytes (71%). Free: 77021 bytes (29%).         
Second Nonvolatile Program Memory Size: None         
Internal SRAM Size: 64K bytes         
Architecture Identifier: AT91SAM7Sxx Series         
Nonvolatile Program Memory Type: Embedded Flash Memory

and  hw tune with tag
proxmark3> hw ver
[[[ Cached information ]]]
         
Prox/RFID mark3 RFID instrument         
bootrom: /-suspect 2016-08-18 16:24:28
os: /-suspect 2016-08-18 16:25:05
LF FPGA image built for 2s30vq100 on 2015/03/06 at 07:38:04
HF FPGA image built for 2s30vq100 on 2015/11/ 2 at  9: 8: 8
         
uC: AT91SAM7S256 Rev B         
Embedded Processor: ARM7TDMI         
Nonvolatile Program Memory Size: 256K bytes. Used: 185123 bytes (71%). Free: 77021 bytes (29%).         
Second Nonvolatile Program Memory Size: None         
Internal SRAM Size: 64K bytes         
Architecture Identifier: AT91SAM7Sxx Series         
Nonvolatile Program Memory Type: Embedded Flash Memory

and without tag
proxmark3> hw tune

Measuring antenna characteristics, please wait........#db# DownloadFPGA(len: 42096)         
.         
# LF antenna:  0.00 V @   125.00 kHz         
# LF antenna:  0.00 V @   134.00 kHz         
# LF optimal:  0.00 V @ 12000.00 kHz         
# HF antenna: 17.02 V @    13.56 MHz         
# Your LF antenna is unusable.

To run 'hf mf mifare' display #db# Mifare: Can't select card and sometime 'hf search' can't read the tag

k9

Contributor

Registered: 2016-08-18

Posts: 5

Re: [solved] why the last firmware do not work well with hf antenna?

sorry, with tag output was
proxmark3> hw tune

Measuring antenna characteristics, please wait...#db# DownloadFPGA(len: 42096)         
......         
# LF antenna:  0.00 V @   125.00 kHz         
# LF antenna:  0.00 V @   134.00 kHz         
# LF optimal:  0.00 V @ 12000.00 kHz         
# HF antenna:  5.17 V @    13.56 MHz         
# Your LF antenna is unusable.         
# Your HF antenna is marginal.

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: [solved] why the last firmware do not work well with hf antenna?

So bootrom/fullimage looks good.  I suppose you took and compiled latest source from GitHub PM3 Master.

First hw tune, you got 17v,  which is a ok HF.
second, it seems like you put a tag on the antenna.   Which means it powers the tag. 

If you haven't used PM3 for a year,  you need to have a bigger distance between tag/antenna  now.  About 2-3 cm,  to get commands like "hf 14a reader" to work.

k9

Contributor

Registered: 2016-08-18

Posts: 5

Re: [solved] why the last firmware do not work well with hf antenna?

You are right, the distance solves the problem, both pm3 have less than a year.

Thanks for the solution iceman!!

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: [solved] why the last firmware do not work well with hf antenna?

Yr welcome.

please edit your first post and add [solved] in the beginning of yr title.