10Watt Two Metre Run

Below is a part image of the Anetnna CAD program. The info to see here is the 50 ohm stub antenna, which in this case used as a impedance matching lower arm to a 4 metre long offser centre vertical. The combination is an antenna with an inductive reactance of 1130 ohms, equating to a 6dB gain.

When used with a 2m multi mode with a 10 watt linear amp, the below distance predictions apart from propagation restrictions are interesting.

The image below is for a 5MHz front-end bandwidth.

But if a 2MHz front end bandwidth is used, interesting results.

Now the things is here, if a 1MHz front end is used, I seen such on the web, then the following could occur. Do note the "2·5 watt" Tx power, the PW QRP contesting.

Mind you, with the two metre multi mode on SSB tuned to 144·300Mhz calling, with a lift conditions, who knows what would be found.

Now if we use Ofcom emf rules to this setup, shown below,

Then the range model, the other losses and feeder losses add to 1·4dB for a 10m run of "mini 8" coax, therefor the additional path loss increases by 1·4dB to a totoal of 71·4dB. The model comes out as follows:-

So, we have our subject test spec.

Happy Dxing.