Products > Test Equipment
Beehive vs. Tekbox EMC probes and amplifier
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_Wim_:

--- Quote from: pdenisowski on May 18, 2023, 03:50:30 pm --- but noise figure is one of the few measurements where I use a proper torque wrench to tighten connectors :)   

--- End quote ---

Yes, I do to. I did try if some pick-up was via the power supply lead by adding a  few ferrites, but that did not help.

Anyway, the result remains useful typically, even with the noise pick-up
coppercone2:
I say beehive they put a switch on the amplifier and it has better connectors

you will never get the tekbox powered up, it looks like it has that esoteric usb connector on it
pdenisowski:

--- Quote from: coppercone2 on May 19, 2023, 04:54:13 am ---you will never get the tekbox powered up, it looks like it has that esoteric usb connector on it

--- End quote ---

It's a standard USB Mini-B connector (not sure if that counts as "esoteric" these days :))   It did come with a cable too.

The probes and preamp also all came in a very nice, high-quality wooden box:  I was kind of surprised by that.
_Wim_:

--- Quote from: _Wim_ on May 18, 2023, 01:00:33 pm ---Also this amplifier seems to reasonable meet is specs (and the specs of the SPF5189). I am picking up some noise in the lab, the spikes on the noise factor come and go. For about 4€ including shipping a very useable device also.

--- End quote ---

It does seem to be a hit an miss with these boards. A friend of mine bought 2 board from this seller (https://www.aliexpress.com/store/2961268?spm=a2g0o.detail.100005.2.623e2421xlV5yH) and the response looks completely different. NF >3db but gain is a little flatter. Visually his 2 devices look identical to mine.


nctnico:
Are these using the same amplifier? If the gain is flatter then I doubt it. Or there is something wrong with the boards.
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