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OE1RFC

by datacop — last modified Jul 04, 2012 01:02 AM
tech // electronics // wireless communications // community networks // embedded systems // open source // amateur radio

UV-5R measurements

by datacop — last modified Apr 16, 2012 10:40 PM
Harmonics and output power measurements of the cheap Baofeng UV-R5 2m/70cm amateur radio handheld FM transmitter.

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.

Test Setup

device under test: Baofeng UV-5R
Spectrum Analyzer: Anritsu MS2721B
separated by: two 20dB high-power attenuators.

2m

harmonics

UV-5R 2m harmonics

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)

channel power

UV-5R 2m channel pwr (carrier)

37.2dBm (5.2W) output power at 145.725MHz, FM carrier.

UV-5R 2m channel pwr (noise)

about the same with white noise.

70cm

harmonics

UV-5R 70m harmonics

2nd harmonic at -62dB, 3rd harmonic at -51dB.

(again I forgot the 40dB attenuators)

channel power

UV-5R 70cm channel pwr (carrier)

36.0dBm (4W) output power at 431.350MHz, FM carrier.

UV-5R 70cm channel pwr (noise)

again pretty much the same with white noise.

hello world!

by datacop — last modified Jul 04, 2012 01:00 AM
I'm starting a blog.

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 Icom IC7000 display protocol I reverse engineered.