This weekend I had the opportunity to use a spectrum analyzer, so I tested the new Baofeng UV-5R 20/70cm ham-radio handheld radio which is rated at 5W output.
The UV-R3 is said to have horrible harmonics and since the UV-5R is in the same price range I didn't expect much, but it turns out that Baofeng really made huge improvements.
device under test: Baofeng UV-5R
Spectrum Analyzer: Anritsu MS2721B
separated by: two 20dB high-power attenuators.
You can see that the 2nd and 3rd harmonic are at about -50dB, that's a lot better than the -14 to -20dB of the UV-3R.
(notice that I forgot to add the 40dB offset of the attenuators, but since we're not interested in absolute readings that doesn't matter)
37.2dBm (5.2W) output power at 145.725MHz, FM carrier.
about the same with white noise.
2nd harmonic at -62dB, 3rd harmonic at -51dB.
(again I forgot the 40dB attenuators)
36.0dBm (4W) output power at 431.350MHz, FM carrier.
again pretty much the same with white noise.
Yes, I'm starting a blog...
Well, not only a blog, this should be a knowledge base of what I'm doing, code snippets, various projects etc...
For a start I added the first (but bigger) half of the IC7000 display protocol I reverse engineered.