Hello VLF,

I like to do some local test here with Spectrum lab setings (and who knows, High ERP transmissions later  :-)

I have here a notebook that generates a signal with the Signal generator in Spectrum Lab at 8970.1 Hz.

It has a Loop connected at the input and thats how it is locked to a GDO (HWU, FTA, what is available)

I tried several, and that Lock wondow gets green, but output looks terrible.

To radiate the signal I use a pice of wire at the notebook LS output.

 

Below two grab's over the same periode of time.

My localy generated signal at 8970.100 Hz and for comparison the signal of DJ8WX at 8970.022 Hertz.

 

Both grab's are made with the same Spectrum Lab task.

 

Why does my signal look like a widband FM transmission ?

 

 

 

Best 73's, Peter - PA1SDB