Electronics > Projects, Designs, and Technical Stuff
DIY 1.8GHz spectrum analyzer
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Theboel:
It's getting better with "eBay ready" parts like that
bd139:
Nice job! That's seriously impressive work!
erikka:

--- Quote from: Theboel on June 06, 2019, 10:19:37 am ---It's getting better with "eBay ready" parts like that

--- End quote ---
Well... There are some parts you better not order from eBay. I did receive my share of counterfeits and bad parts. Even from known good suppliers
Examples:
ADE-11X being relabeled as ADE-25HM
Mixer module with -27dB conversion loss
ADL5801 module with bad performance
Ultra low noise MICC, 10 pcs, all with twice the normal current so they will self destruct within days
notadave:
How did you know the ADE-11X could output much lower than 5MHz ? Looks like it is meant for IF of 30MHz.

I would not even have had the idea that one could by stuff like that off eBay!

Earlier this year I had the idea to make something similar, but for much lower frequency, with DVB-T ICs or an ADC (I did not have the idea to use a sound card thinking they were 44.1kSps and 16bit.) but a 24bit sound card is a great/better solution.

I concluded that generating the two LO signals in fine steps and without jitter was too hard.
erikka:
Many double balanced diode mixer has one port that can go to DC. The port directly connecting to the diodes. Some mixers have a balun between the port and the diodes, those won't work to DC
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