Re: LF: Generating 8970 Hz carrier with Spectrum Lab ?

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Hi Roger,

Am 25.04.2012 11:38, schrieb Roger Lapthorn:

Another question for Wolf etc: how would one use a single PC with two instances of SL running to (a) lock the soundcard to an 18-22kHz MSK signal like GBZ one one instance and then (b) generate a (frequency stable and locked)  output signal for an 8.970kHz TX?

You can do it in a single SL instance. Actually it must be done in one instance, as long as the generated frequency should be locked. Use the input to receive your reference signal and to lock on. Disable the filter box (stopped and not bypassed) in the components circuit window. Switch the frequency generator to L5, or the digimode terminal.
That's all.

73, Stefan/DK7FC

It is some months since I have used SL and I was never what might be called an "expert user".

73s
Roger G3XBM

On 25 April 2012 10:12, PA1SDB, Peter <pa1sdb@amsat.org> wrote:

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

 

 

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