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Quangsheng UV-K6 (V2???) Problems

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  This radio is marked as a "UV-K6" on the confirmity/serial number sticker. On the motherboard is a "V2" that was written on the ground at the factory. The MCU is markings are: PY32F030 K28T6 2G1TK1B See below for photos of what I believe are significant identification markings. At some point I had this running, the version shown below but now the radio will not boot into the OS/Firmware, but it will go to DFU mode. I.e. LED on, nothing on screen.  Note the "V2" Sharpied onto the ground in the image below. That V2 was added in the factory and on the board when I first opened it. MCU Markings PY32F030 K28T6 2G1TK1B Note the "V2" Sharpied onto the ground in the image below. That V2 was added in the factory and on the board when I first opened it. \
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Coaxial cable - coax aka coaxen

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 Information pertaining to and about co-axial cable and connectors for co-ax. RG402 - semi rigid co-ax similar to that used for many 5ghz FPV antennas. Nicely sized for your avearage SMA connector Type 31 Ferrite - EMI  suppression from 1 to 500MHz. Type 43 Ferrite 43 material Nickel Zinc suitable for wideband transformers up to 50MHz, and suppression of EMI from 3 to 250MHz bands ui=800.  43 material is also ideal for suppression of switching noise from switch mode power supplies by winding the mains power cable through a larger toroidal core multiple times.  These are also recommended for use on HDMI cables from computer video cards to suppress noise in the 3 to 20MHz bands.  Commonly used for construction of 3 to 30MHz Antenna Baluns and 1:1common mode RF chokes.  Refer to the  43 Material Data Sheet  for more information. Co-ax connector crimp sizes sourced from DX Engineering: https://static.dxengineering.com/global/images/chartsguides/d...
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A Paddle

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Tumd morse paddle (key) I'd like to learn morse, so my partner kindly bought me a morse key. Actually it's a paddle, not a key, but I may refer to it as a key in this post. Please give me a pass on this. The main reason for this page is just a place to keep a copy of the cut-away image from the online sitre, just in case it dissapears from the rest of the internet. That image is probably the only help I'll get if I need to pull the paddle apart. Or more likely if I give in to the urge to pull the paddle apart because hacker nerd engineering head. But I hope some of the words I've stuck on here along with that picture are useful or interesting to someone. This key is called a "Tumd" - I think that is the brand name of the manufacturer - as I have seen some other paddles under the same brand. I'm not sure of the excact model name, but the AliExpress listing title was " Tumd CW Paddle CW Key Handheld Tapper Modern Morse key Double paddle Amateur radio ke...
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Parts

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  The parts on this page were from an order from https://www.sotabeams.co.uk/ - a UK business that makes and sells antennaes, antannae components for DIYers and other radio related components and kit. The found (apparently now retired) Richard Newstead (G3CWI) used to have a great You Tube channel https://www.youtube.com/user/g3cwi but sadly it appears he has made the videos private now :-(. I bought these components with the intention of building a linked dipole using the calulator below - which I think might have been on SOTA beams own website a few years ago. I hope there has not been some kind of fall out within the company as my experiences were really positive and I really enjoyed Richard's videos. https://portable-antennas.com/ https://portable-antennas.com/linkd.php  SOTA Beams - order Jun 2021 1 × Co-axial cable - RG174A/U (with or without BNC plug fitted) 5m -  https://www.sotabeams.co.uk/co-axial-cable-rg174a-u/ 1 × Co-axial cable - RG174A/U (with or witho...
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Things to remember

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  Disclaimer Electricity is dangerous and you can suffer death or serious injury if you use incorrect or erroneous information. This page is essentially an aide memoire for my personal use. It is on the web so that I can accesses it easily from wherever I am using whatever device is at hand. You should find other references for your own use. I am not an engineer or electrician. I have no formal qualifications. I have just googled this information and taken results I think look reasonable from sources I think might be authoritative. You should find your own sources and check their quality, veracity and authenticity . Electricity is dangerous and you can suffer death or serious injury if you use incorrect or erroneous information.   Glossary λ- wavelength - also the Greek letter Lamba. Unit: metres Ω - ohms - the unit of resistance/impedance. The Greek letter Omega. c - constant -  the speed of light in a vacuum also see 'v'. Unit: metres per second  C - the symbol for...
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