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And don't forget the DC Block, particularly if working on tube (valve) equipment. Cheers...Bob VK2ZRE

And maybe I have the wrong bin file.

Hi Martin, You are absolutely correct. I thought about it a bit more pretty much as soon as I pressed "send'. I have now extracted my foot from my mouth and have put my teeth back in:-) Firstly,

OR actually I am in the tinysa http://athome.kaashoek.com/tinySA4/DFU/ I need explicit instructions for the Ultra, please. The index site doesnt seem to have it.

I have STM loaded and the current Ultra bin file. It is safe to follow the TinySA update pdf or is there a TinySA Ultra update pdf?

I would not put 1n4148 diodes in there, 2 of them anti parallel into 50 ohm is roughly +10dbm. While that not always destroy the TinySA it will be past safe limits. I would say 2 low capacity? diodes

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