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  1. flippineck

    String Theory

    It says no heated discussion of religion / politics so excercise restraint, but, please discuss string theory. Little tiny wigglers that are the basic building blocks of everything. Fascinating. But, is it possible to discuss without bringing in the maths?
  2. flippineck

    Ultra low power 3g repeater?

    I have bad cell signal inside the house but reasonable outside. My phone is a sony smartphone that does not have an external antenna socket. After a whole bunch of experimentation I found, using different kit (a mobile broadband router that does have external antenna connector), that an...
  3. flippineck

    rf transparency of plastic

    I am trying to cook up a simple collinear antenna for 1800 MHz and one for 800 MHz. I'm following plans which involve bending coils into copper wire and then enclosing the copper wire inside a length of white pvc electrician's conduit. the plans are for 2.4GHz though. they regard the pvc...
  4. flippineck

    Antenna design again

    I've given up with my yagi for my 2100MHz mobile phone / internet unit. Firstly, it seems that the tower I have it pointed at, probably isn't in use anymore :o The UK Ofcom database of cellphone masts appears to be horrendously out of date. I tried installing an app on my smartphone...
  5. flippineck

    Homebrew passive antenna coupler

    I have a Sony Xperia phone. As far as I know it works on the 2100MHz band, and the antenna is housed in the bottom part of the phone, widthwise along the base. There's no jack on the phone for an external antenna, but I'd like to try connecting one. I've come across 'passive coupler'...
  6. flippineck

    Yagi-Uda antenna 2100MHz

    Here is my local (UK) cell tower: Station Type: Macrocell Height of Antenna: 13.7 Metres Frequency Range: 2100 MHz Transmitter Power: 17.89 dBW Maximum licensed power: 35 dBW Type of Transmission: UMTS It's no...
  7. flippineck

    SMA crimp plug

    http://www.maplin.co.uk/p/maplin-sma-crimp-plug-rg58-mm55k I have something like the above. Not pictured on the above link, is a sort of short length of metal tube that seems to slide over the knurled part, with a tad of clearance. I stripped back my coax cable & was able to assemble...
  8. flippineck

    Ebay DC - DC boost converter

    I bought a dinky little DC to DC boost converter on ebay. It has a twin screw terminal input block, and a twin screw terminal output block. The listing says it will accept a DC input of something like 10 to 60 VDC, and output anything from 12 to 80 VDC. On the board, there are two trim pots...
  9. flippineck

    Soldering Aluminium Sheet 3mm Thick

    Soldering Aluminium Sheet 3mm Thick Grade/Spec: 1050A H14 - a commercial purity alloy giving excellent corrosion resistance. It is Ideal for welding, bending and moulding. It is also suitable for painting. I have a sheet of this aluminium sheet, roughly 50cm x 40cm I want to try soldering one...
  10. flippineck

    Car Battery Bounce Eliminator

    Problem I have is this: I connect the 12V lead acid battery in my car by bolting on the terminal. I think the manual says always connect the negative terminal last. When I do, there are loads of sparks and sometimes even the alarm goes off. I imagine the main supply rails all over the car...
  11. flippineck

    Solar Panel Configurator

    I have a solar storage setup composed of six 80 watt panels, a cheap ebay regulator, and a 12V leisure battery hooked up to a 12VDC--->240VAC inverter. I've connected all six panels together in parralel. The voltage output from the array varies from near zero (16 millivolts) in the dead of...
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