Baofeng and why you don't want to use one.
https://www.youtube.com/watch?v=Vn_jKSJXK5U This is some testing for the harmonics and spectral purity of the popular Baofeng UV-5RA radio. This failed both amateur standards and commercial (part 90) standards for harmonic suppression. I bought this off Amazon this week for 25 or 30 dollars. It's ok to receive with, but it's in no way legal to use for transmit. 73's -- Bryan Fields, W9CR Florida Simulcast Group, Inc.
It's good to note that the VHF 2nd harmonic frequency of 298.x MHz doesn't appear to be in the middle of a mil air band. This rig should be good to go in south Tampa... 73, Jon Pearl - W4ABC On 12/8/2016 1:43 AM, Bryan Fields wrote:
https://www.youtube.com/watch?v=Vn_jKSJXK5U
This is some testing for the harmonics and spectral purity of the popular Baofeng UV-5RA radio. This failed both amateur standards and commercial (part 90) standards for harmonic suppression.
I bought this off Amazon this week for 25 or 30 dollars. It's ok to receive with, but it's in no way legal to use for transmit.
73's
--- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
Here's Ron's response to Bryan's post of the same subject on the TARC reflector: Here couple spec anal test of my UV5R on high power, one on 2m/VHF and the other at 448 MHz/UHF. The 2nd harmonics are over 40 db down. I think in the YouTube video the spec anal was being over loaded, a common mistake made when testing a device. To check this one should attenuate the signal to see if the ratio of the fundamental to harmonic levels change. If after putting in 10 db attenuation and the fundamental reduces by 10db, but the harmonic say by 30 db this would indicate overloading the spec anal front end and the harmonics are generated inside the spec anal. We have seen the test the ARRL has done on these Chinese radios and the results aint all that good. I am sure yur UV5R would show different results, some better, some not better. What can we expect from a $30 HT, hi. 73, ron, n9ee/r a know code Extra Ron Wright, N9EE/R BSEE Micro Computer Concepts 352-683-4476 mccrpt@tampabay.rr.com On 12/8/2016 1:43 AM, Bryan Fields wrote:
https://www.youtube.com/watch?v=Vn_jKSJXK5U
This is some testing for the harmonics and spectral purity of the popular Baofeng UV-5RA radio. This failed both amateur standards and commercial (part 90) standards for harmonic suppression.
I bought this off Amazon this week for 25 or 30 dollars. It's ok to receive with, but it's in no way legal to use for transmit.
73's
--- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
I filter Ron, he's a drunk. Sent from my iPhone
On Dec 9, 2016, at 16:49, Jon Pearl - W4ABC <jonpearl@tampabay.rr.com> wrote:
Here's Ron's response to Bryan's post of the same subject on the TARC reflector: Here couple spec anal test of my UV5R on high power, one on 2m/VHF and the other at 448 MHz/UHF.
The 2nd harmonics are over 40 db down.
I think in the YouTube video the spec anal was being over loaded, a common mistake made when testing a device. To check this one should attenuate the signal to see if the ratio of the fundamental to harmonic levels change. If after putting in 10 db attenuation and the fundamental reduces by 10db, but the harmonic say by 30 db this would indicate overloading the spec anal front end and the harmonics are generated inside the spec anal.
We have seen the test the ARRL has done on these Chinese radios and the results aint all that good. I am sure yur UV5R would show different results, some better, some not better. What can we expect from a $30 HT, hi.
73, ron, n9ee/r a know code Extra
Ron Wright, N9EE/R BSEE Micro Computer Concepts 352-683-4476 mccrpt@tampabay.rr.com
<N9EE.jpg>
On 12/8/2016 1:43 AM, Bryan Fields wrote: https://www.youtube.com/watch?v=Vn_jKSJXK5U
This is some testing for the harmonics and spectral purity of the popular Baofeng UV-5RA radio. This failed both amateur standards and commercial (part 90) standards for harmonic suppression.
I bought this off Amazon this week for 25 or 30 dollars. It's ok to receive with, but it's in no way legal to use for transmit.
73's
This email has been checked for viruses by Avast antivirus software. www.avast.com
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participants (3)
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Bryan Fields -
Bryan Fields, W9CR
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Jon Pearl - W4ABC