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Hi Martin et al, thanks very much for the information it’s very much appreciated, as I said my main worry was blowing up the output of the rf generator, the scope probe is definitely one I will try.

And another thing... If you want to build your own passive probe, then using a series connected resistor and capacitor is a better option. The principle is described on this

One other thing I forgot to mention. You can use a X10 scope probe with a spectrum analyser and will obtain a similar level of attenuation. This can be handy, for example, when tracing an RF signal

Hi Bob, Yes, I'd agree on these theoretical values, but a lot depends upon the probe construction and the load impedance, and I have successfully used this technique in practice for many

Actually the figure is about -52.5dB. 9 MegOhm/50 Ohm divider. 10log(1.8 x 10minus5). 73...Bob VK2ZRE

+1 on the 10X scope probe. ?

You will get about 20 to 30dB loss through a X10 probe, as they are designed for use with a high input impedance scope. But if you are not bothered about the accuracy of the signal amplitude, it's a

You're right, please see Erik's comment ( "The minimum output level is -115dBm" ): /g/tinysa/message/14395 And here's the start of this

Hi Martin, thanks for the reply, I never thought of the x10 scope Probe idea, I do have signal generators but it’s the time waiting for them to stabilise that can be a pain. regards Amanda

Personally, I'd place an extra external attenuator on the generator output, and then use a DC blocking capacitor. If you are not worried about absolute signal levels, then put something like a 1k ohm

Hi all, I’m considering using my TinySA Ultra as a signal generator to fault find a VHF SSB transceiver, I want a stable 10.7MHz signal that I can inject into the signal chain but I’m worried

AFAIK the fault was that the older FW versions allowed you to enter an illegal lower value output (-124dBm?) than the hardware can actually achieve. So with the older FW if you entered -124 you still

Here’s an interesting paper on the topic - https://www.ion.org/publications/abstract.cfm?articleID=5389 -Charlie

See specifications in the tinySA Ultra Wiki.? The minimum output in the signal generator mode is depreciated to -115dBm. "Output level selectable in 1dB steps between -115dBm and -19dBm" Herb

I have installed firmware version 151 and the output signal in generator mode is maximum -115dBm. Not changed at -124 dBm

Bob, There is a bug in the number out Hope to fix in next fw update -- Designer of the tinySA For more info go to https://tinysa.org/wiki/

Use the lna command. Not the lna2 command -- Designer of the tinySA For more info go to https://tinysa.org/wiki/

Hi Simon, In the Github discussions would be my preference for ideas/suggestions.? There is a also an issues list in Github. https://github.com/g4ixt/QtTinySA/discussions Ian

Hi all Has anyone had trouble with dodgy data in the dBm field in the data returned from a sweep.? e,g, "sweep 520M 530M 21" I am getting: 552700000 -:.000000e+01 0.000000000 You will notice that

That's OK, But I do need the LNA it gives me a big boost in SNR. The TV signals are down around -80dB mark. Regards RJG