West mountain radio battery analyzer.

West mountain radio battery analyzer.

you Use a PC to accurately test your battery

Easy to use software helps to determine actual AMP hour capacity Works with Lead Acid, Lithium-Ion or Alkaline batteries.

You can overlay multiple test results and compare battery performance over a period of time, testing information, such as measured capacity.

Ability to test power supplies with a constant load or test solar panels over various loads or power supply testing.

 

Yaesu FT991/FT991A VHF and UHF wideband modification.

Yaesu FT991/FT991A VHF and UHF wideband modification.

There’s talk of a wide band “get around” on the VHF/UHF portion of the FT991/A.. well I dont want to be the bearer of bad news! BUT!!!!!! if you change the band from EU to USA it is a ONE WAY TRIP! it will wipe out a lot of your RX frequencies leaving you little or no option other than a full hardware wide band mod..  It could also wipe out the 3 year warranty instantly..

It is blooming frustrating not being able to wide band the VHF/UHF portion of the radio but it simply is not possible without some form of compromise. changing the radio from EU to USA spec may also de value your radio..

G

Coax cable, plug and adapter losses

Coax cable, plug and adapter losses

I gave myself a little project earlier this week, to explain in layman’s terms how much is lost through a connection and coax..

I asked one of the engineers at work and he gave me the formula

IL(db) = 10log10 * power in/power out = loss in db.

So I went to work in excel using the formula, get the spreadsheet from here cable loss

Known loss of cable or plug, loss-/+ /10 10x *power in = power out..

To say I was shocked was an understatement! RG58 generic has a loss of 4.9db that equates to 10watts in @ 100mhz = 3.23 watts out! In fact you’d have to push rf through the cable @ 30 watts to get the desired 10 watts out..

Connectors are also potentially lossy, but a good connection will be <0.01db loss.. if it’s any more you will notice connections getting hot/warm at 100-400 watts and melting at >kw.

MD2017 comparison to ReteVis RT82

MD2017 comparison to ReteVis RT82

The MD2017 Entered the amateur radio media with 3000 memories and boasting the first dual channel dmr, Well! Who actualy manufactures the radios? Because ReteVis also produce a stunning example. Better firmware and a much nicer antenna design! I am told that ReteVis are the manufacturer for both the md2017 and RT82 radio, who truly knows!!! Answers on a post card to: someone who cares, pobox99.

For me the ReteVis is a more attractive radio and the antenna design is better on the eye, the jury is out on what the masses settle on! But the RT82 is a peach of a radio, I have both the md2017 and the RT82 I just gravitate toward the ReteVis and having used both for a couple of days side by side I will buy an RT 82 for myself..

You can purchase one now, they are in stock @www.hamradio.co.uk order before 1pm Friday 7th for Saturday delivery option.. mention me! 😉

HackRF SDR Transceiver 1 MHz to 6 GHz operating frequency

HackRF SDR Transceiver 1 MHz to 6 GHz operating frequency

  • 1 MHz to 6 GHz operating frequency
  • half-duplex transceiver
  • up to 20 million samples per second
  • 8-bit quadrature samples (8-bit I and 8-bit Q)
  • compatible with GNU Radio, SDR#, and more
  • software-configurable RX and TX gain and baseband filter
  • software-controlled antenna port power (50 mA at 3.3 V)
  • SMA female antenna connector
  • SMA female clock input and output for synchronization
  • convenient buttons for programming
  • internal pin headers for expansion
  • Hi-Speed USB 2.0
  • USB-powered
  • open source hardware