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Amanda, your email on qrz is not valid. Drop me an email to mine and I will give you further info. 73 Dave

John, For instance?? Sure I could look up diode data sheets & spend considerable time reviewing specs.? It sure would be easier if you (someone) provided some examples.? Then the time could be

Martin, I agree, the 1N4148 is the diode that is probably in every junk box and will work. I just thought about trouble shooting I have done in the past especially on tube receivers and TV audio IF in

I am away from home until Monday, but there is a chance I have a spare board I can post you FOC. I will drop you an email via your QRZ email. 73 Dave

Suggest you contact your supplier as this is not easily to fix with some setting -- Designer of the tinySA For more info go to https://tinysa.org/wiki/

As the generator output power is decreased from the starting value of -17dBm, the signal level received drops into the receiver noise at around -30dBm and then at around -40dBm the signal level

Hi John, Yes I'd agree. My thinking was to use parts that folks were likely to have lying around, and 1N4148's seemed to be a better option than nothing. It was to try and limit short duration

Hi Bob, Ha, you and me too. The number of times I've pressed send and then immediately had a Doh moment... Someone once said "you learn more from your mistakes" if that were true I'd be competing

Hi Dave, not being in the know about pcb files, how do I go about sending the info to the PCB manufacturer you used? regards Amanda M0DZO

Marek's design is very good if you actually require an active probe. They have their uses, but in my experience in most cases, you don't require the additional sensitivity or high input impedance

Where, from what do You see that the pdf is directed to TinySA ? István

There has been quite a thread on this forum on the construction of a probe that limits the signal level into the spectrum analyser, I built one based on the design by Marek, notes and details of both

Thank you. I have the sa4. I hold down the jog wheel ans power to enter DFU. Will the stm32 see this as I follow the tinySA_Firmware_update_stm32CubeProgrammer? I ask because the pdf seems geared

tinySA or tinySA3 -> tinySA tinySA4 -> tinySA Ultra

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