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For now there are sufficient candidate testers. -- HBTE Files section: /g/HBTE/files Erik, PD0EK

Erik, I am certainly interested in this latest effort and would love to test it out - please do keep me advised - thanks, Marty (KN0CK)

I will be interested in the commercial version as well.? Let us know when it would be available. 73 Evan AC9TU

Hi, I am not one of the testers you are looking for but I would probably be a customer when you get to that point. I hope you keep us informed. 73, Bill KU8H

Erik, that looks great! Nice idea to use the SI4432 direct for high frequencies. I am sure you will be flooded with offers to test, and much as i would love to test this I also would like to continue

Yay! Great news. I'll be waiting for the first production run. I am actually working on my own version of the tinySA, but I am not quite there yet, so I am willing to donate the parts back into the

Very nice, I was wondering if someone would pick it up as a commercial project, glad that it was you. With a bit of luck it will be a success as the NanoVNA.

During the last weeks I have been a bit quiet here as most of my time when into designing, together with Hugen, of a self contained, ready build, hand-held version of the tinySA to be sold for a very

Hi all, just wanted to introduce you to one my of latest projects which started with me buying a HP33322H step attenuator (0-110dB 10db steps) which I needed to be able to control. So instead of

You can measure the distortion from your input buffer by comparing two measurements. One with your input buffer. Second with a high impedance attenuator (-5 to -6dB) before you input buffer. If the

I want to look at vacuum tube boatanchor signals (mixer signals). These are high impedance so I need some kind of input buffer I guess. I thought about this because of the link to Hans's spectrum

The VCO can sweep very fast. Full range within 10mS. No PLL to settle -- HBTE Files section: /g/HBTE/files Erik, PD0EK

You should be able to construct a ramp ot a triangle wave generator with most op amps or a programmable waveform generator like the AD9833. It depends on how fast/slow this oscillator can be swept. At

The design from Hans Summers works very well and is easy to build http://hanssummers.com/spectrumanalyser/sasweepgen.html You could use a 10 turn potmeter for the center frequency Make sure you select

Do you have a prefered version of the op-amp circuit for a sweeper like this?

Sometimes you need a swept sine generator and you don't have one available. How about building one? Sounds complex but it is actually fairly simple. If you search ebay for "12V RF controlled

Just to explain a bit further. The AGC curve actually tracks the pass band of the BPF as the AGC reacts to the total energy that enters the SI4432 and that is within rather broad borders of its

Erik, IF_Freq = 433670000; seemed to be the "sweet-spot" for me, any lower and the amplitude of the reference signal started to reduce, and the "spur" seemed to move to the other side of the reference

The AGC gain going down at 13.7MHz indicated the IF frequency is not optimally aligned with the BPF. Try to reduce the IF frequency in steps of 0.1MHz Don't go too far as this will reduce the

Dave mine too in that setup. vk3pe