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Author Topic: Chinese Radios  (Read 1675 times)

K1FBI

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Re: Chinese Radios
« Reply #15 on: April 09, 2022, 04:43:35 AM »

So basically you want the Manufacturer to provide documentation to help you make their FCC certified radio Illegal.

What FCC certification?

- Glenn W9IQ

Aww...you spoiled the fun. BINGO, we have a winner.
Chinese radios are certified with a CMIIT ID which is the equivalent of our FCC certification. They are only certified for the given frequencies of operation and specified power.
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KD7RDZI2

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Re: Chinese Radios
« Reply #16 on: May 21, 2022, 02:29:50 PM »

Everybody's favorite subject!! lmao

Anyway.. Does anyone know the maximum allowable voltage on the Mic Jack of a Chinese radio? (specifically in my case, a Wouxon KG-UVD1)  but I imagine a Baofeng or any other similar Chinese radio would be similar.
I have the UVD2 which essentially should be the same, a good product but with no service manual. As the mic is a condenser type, I would guess the input would be 30 mV or so. I would stay below 100mv. I am not sure I really responded your question. But to properly respond I think It would be useful to clarify better why you need it to know. Speech processing (compressor), audio levels for winlink modems,  aprs?
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LA9XNA

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Re: Chinese Radios
« Reply #17 on: May 22, 2022, 02:40:18 AM »

Many of these radios are based on a transceiver IC like the RDA1846 or similar.
If you are planning to use the transceiver for Packet or similar the best way to get it operational is probably to poke around and try to interface with the chip.

Its also possible to hack some of these radios wit software. A while ago i found a page where somebody made a controller for a UV5R on a MCU.
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N8AUC

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Re: Chinese Radios
« Reply #18 on: May 22, 2022, 09:00:17 AM »

Should be in the specs...no?




Specs? What specs?
Have you ever owned a Chinese radio? My BaoFeng Owner's Manual has two charts of Technical Specifications.

Chinese were doing things like building the Great Wall, inventing gun powder and practicing medicine long before a bunch of misfits got so arrogant in a Country founded a few hundred years ago.

Yes, in fact I own more than one.
There are some specs in the back of the manual.
But the information is rather superficial.
You won't find data on allowable audio input voltage levels.


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K1FBI

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Re: Chinese Radios
« Reply #19 on: May 24, 2022, 06:57:43 PM »

Your posting is also rather superficial
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W9FIB

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Re: Chinese Radios
« Reply #20 on: May 25, 2022, 03:48:18 AM »

It is called reverse engineering. If you know how the parts of the radio work, what your proposing should be a piece of cake. If you don't, then you're probably looking to copy someone else's work.
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73, Stan
Travelling the world one signal at a time.

KF6IIU

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Re: Chinese Radios
« Reply #21 on: May 29, 2022, 02:12:35 PM »

I don't think anyone actually answered your question.

From pinout diagrams I see on the web, the mic jack of Baofeng HTs seems to be more or less the same as any other HT. "Maximum voltage" is not really your parameters of interest. What you are interested in is input impedance. With the wrong match you will get poor performance on digital modes because the frequency response or signal level will degrade performance. Your signal will become loud and distorted long before exceeding any "voltage level" on the input.
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K1FBI

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Re: Chinese Radios
« Reply #22 on: May 29, 2022, 06:40:44 PM »

I don't think anyone actually answered your question.

From pinout diagrams I see on the web, the mic jack of Baofeng HTs seems to be more or less the same as any other HT. "Maximum voltage" is not really your parameters of interest. What you are interested in is input impedance. With the wrong match you will get poor performance on digital modes because the frequency response or signal level will degrade performance. Your signal will become loud and distorted long before exceeding any "voltage level" on the input.
You didn’t answer his question either???
All you did was tell him he was asking the wrong question….
What a strange thread🥳
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VK4HAT

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Re: Chinese Radios
« Reply #23 on: June 30, 2022, 11:00:34 PM »

Everybody's favorite subject!! lmao

Anyway.. Does anyone know the maximum allowable voltage on the Mic Jack of a Chinese radio? (specifically in my case, a Wouxon KG-UVD1)  but I imagine a Baofeng or any other similar Chinese radio would be similar.

At a guess I would say 5V and not more than 7.4V. The rational is simple, the electret insert in the hand mic is probably 5V rated. I am unsure if there is a dropper resistor in the mics, i think not, but if there was, the battery voltage is 7.4V and there is no need for a boost converter in such a circuit.

If you are asking audio voltage level, then not much more than 50mv p/p or whatever a typical electret circuit produces.
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KD6VXI

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Re: Chinese Radios
« Reply #24 on: July 13, 2022, 09:52:19 AM »

So basically you want the Manufacturer to provide documentation to help you make their FCC certified radio Illegal.

And if I make it into a packet radio, for amateur bands which I'm licensed to use, it's illegal how?

But back to the point.  One is hard pressed to modify any radio without the proper documentation.  And learning Chinese to write English docs is not a practical solution.
It doesn't matter what you are licensed for, it's about what your CB radio is type certified for.

People have been modifying CB radios for ham use for a half century and longer.

--Shane
WP2ASS / ex KD6VXI
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K1FBI

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Re: Chinese Radios
« Reply #25 on: July 18, 2022, 06:21:31 AM »

So basically you want the Manufacturer to provide documentation to help you make their FCC certified radio Illegal.

And if I make it into a packet radio, for amateur bands which I'm licensed to use, it's illegal how?

But back to the point.  One is hard pressed to modify any radio without the proper documentation.  And learning Chinese to write English docs is not a practical solution.
It doesn't matter what you are licensed for, it's about what your CB radio is type certified for.

People have been modifying CB radios for ham use for a half century and longer.

--Shane
WP2ASS / ex KD6VXI
People have been breaking the law for centuries; doesn’t make it right.
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WA3SKN

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Re: Chinese Radios
« Reply #26 on: July 18, 2022, 08:45:37 AM »

No.
However... have you tried to measure it?
I would expect about 5 millivolts across a 2000 ohm impedance.

Concerning the Wouxon KG-UVD1...
It is part 90 certified, not part 97.  Expect 2.5 kHz deviation default.
It appears deviation can be adjusted, but is labelled "bandwidth" in the manual.
Remember that the "control operator" is responsible for the output of the transmitter.

-Mike.
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KD6VXI

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Re: Chinese Radios
« Reply #27 on: September 02, 2022, 10:02:21 AM »

So basically you want the Manufacturer to provide documentation to help you make their FCC certified radio Illegal.

And if I make it into a packet radio, for amateur bands which I'm licensed to use, it's illegal how?

But back to the point.  One is hard pressed to modify any radio without the proper documentation.  And learning Chinese to write English docs is not a practical solution.
It doesn't matter what you are licensed for, it's about what your CB radio is type certified for.

People have been modifying CB radios for ham use for a half century and longer.

--Shane
WP2ASS / ex KD6VXI
People have been breaking the law for centuries; doesn’t make it right.

Show me where in ANY FCC regulation it says you can't modify a commercial radio (for nearly any band) for amateur use.

I'll wait.

But, here's a hint.  It doesn't.  Ergo, your stance is invalid.

--Shane
WP2ASS / ex KD6VXI
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K1FBI

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Re: Chinese Radios
« Reply #28 on: October 16, 2022, 03:34:26 AM »

So basically you want the Manufacturer to provide documentation to help you make their FCC certified radio Illegal.

And if I make it into a packet radio, for amateur bands which I'm licensed to use, it's illegal how?

But back to the point.  One is hard pressed to modify any radio without the proper documentation.  And learning Chinese to write English docs is not a practical solution.
It doesn't matter what you are licensed for, it's about what your CB radio is type certified for.

People have been modifying CB radios for ham use for a half century and longer.

--Shane
WP2ASS / ex KD6VXI
People have been breaking the law for centuries; doesn’t make it right.

Show me where in ANY FCC regulation it says you can't modify a commercial radio (for nearly any band) for amateur use.

I'll wait.

But, here's a hint.  It doesn't.  Ergo, your stance is invalid.

--Shane
WP2ASS / ex KD6VXI


If the radio is non-compliant in non-amateur bands (i.e., not certified) — then it cannot be used at all, even in amateur bands. As for the relevant rules, Section 302(a) of the Act specifically states that the Commission’s regulations regarding certification requirements are applicable to the “manufacture, import, sale, offer for sale, or shipment of such devices . . .and to the *use* of such devices” (emphasis added by me). Additionally, Section 97.101 of the rules states that the amateur is responsible for the proper operation of the station in accordance with all of the Commission’s rules, which would also include those governing certification requirements for radios capable of operating in other bands.
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W9IQ

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Re: Chinese Radios
« Reply #29 on: October 16, 2022, 04:32:49 AM »

If the radio is non-compliant in non-amateur bands (i.e., not certified) — then it cannot be used at all, even in amateur bands.

There is no certification required nor even possible for an amateur radio transmitter.

- Glenn W9IQ
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.
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