From 82969b612a83276b87e94e1c886b4424759db1fc Mon Sep 17 00:00:00 2001 From: Erwin Ried <1091420+eried@users.noreply.github.com> Date: Mon, 15 May 2023 12:32:36 +0200 Subject: [PATCH] Updated Preamplifier IC replacement (markdown) --- Preamplifier-IC-replacement.md | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/Preamplifier-IC-replacement.md b/Preamplifier-IC-replacement.md index b7576d2..10ff07b 100644 --- a/Preamplifier-IC-replacement.md +++ b/Preamplifier-IC-replacement.md @@ -1,5 +1,25 @@ -If you find on a strong signal such as an broadcast FM station that you select Amp as "0" and you get a signal and then select Amp "1" and you do not then this is a good sign that the RF Preamplifier u13 (MGA-81563) is damaged. This can happen if you use a stronger transmitter near to your HackRF. +The MGA-81563 can be damaged easily, but you can buy (relatively cheap: https://s.click.aliexpress.com/e/_Dl4U7Yl) and replace them yourself. For more information about this procedure, please check https://www.onesdr.com/2020/04/09/how-to-fix-a-broken-hackrf/ + +The previous link has a very good reference picture: + +![image](https://github.com/eried/portapack-mayhem/assets/1091420/88b9ab27-59e5-48d1-964d-79e72d32657b) + + +# RX problems + +If you find on a strong signal such as an broadcast FM station that you select Amp as "0" and you get a signal and then select Amp "1" and you do not then this is a good sign that the RF Preamplifier u13 (MGA-81563) is damaged. This can happen if you use a stronger transmitter near to your HackRF. It is possible to replace the damaged IC with simple tools (soldering iron, solder wick). First solder flood the damaged component to remove it, preferably protecting the surrounding. Clean the pads and replace the component: - \ No newline at end of file + + +# TX problems + +The same component is used for TX, which also can be damaged. Below is an example of the replacement procedure. First remove and clean the pads. This can be done with hot air or normal soldering iron: + +![image](https://github.com/eried/portapack-mayhem/assets/1091420/28bdbccc-ba8a-4016-bdd9-fc8ce7db4d59) + +For the orientation, you could use the text of the chip itself. It should be "up", pointing to the antenna jack of the HackRF: + +![image](https://github.com/eried/portapack-mayhem/assets/1091420/b6ccd68b-e261-4810-8e0f-dea8a2ff5b95) +