SDS-200 Speaker Noise Again like the 536HP

[WeBeCinYa]

Same here as I got my second radio today with a serial # of 88-0012XX. I am giving the serial number so Uniden can look at their production run. Same here with hearing the noise and if you lay the radio flat on a table you can't hear it. Also, before I updated the firmware from 1.06.25 and sub 1.01.10 same issue, no change. Then I upgraded the firmware to the current 1.07.04 and sub 1.02.00 same issue, no change. I also, tried another micro SD card with no change. The one thing I did notice is that the radio when turned on without the SD card it is silent with no speaker issue, but obviously the card needs to be in the radio so it will work.

I believe when you use a nice high end grade speaker it amp's it up big time and it makes you fixate on it. It's really the only way to hear a nice scanner since the speaker is buried on the bottom. But there is a reason why Uniden designed these radio's with an external speaker jack on the back for this reason.

I do say this is a hardware issue that needs to be addressed for the next production line of radios. Maybe some people can live with it and maybe some can't do it since it is annoying. I am sure Uniden can open up the guts of the BCT15X and the BCD996P2 and see what made these radio's perform flawless. End of my testing. Good Luck.

OP-I had been looking for your follow up with the 2nd radio. So you are saying the exact same issue with the noise is happening on the 2nd one?


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[phyberoptics]

This isn't A/C hum, ground loop, or anything else influenced from outside the SDS200. It sounds like CPU / processing noise.

 

[KB4MSZ]

This isn't A/C hum, ground loop, or anything else influenced from outside the SDS200. It sounds like CPU / processing noise.

Sounds a lot like my Yaesu VX-8DR when it is scanning. I have one of the receivers scanning and the other one listening to a local repeater system. If the receiver squelch is open on the non-scanning channel, it has a slight low level clicking noise as the scanning channel changes from one band to another. It doesn't click as it is scanning within a band of frequencies. To minimize this, I use the programming software to insure the order of scanning completes one band before moving to the next band, not allowing mixed bands of frequencies to follow each other. Makes a big difference.

I'm curious if the processor noise in this scanner follows the same behavior, or if the order of scanning doesn't matter. Is it possible to control the scanning so that different bands of frequencies are not mixed together?

 

[ColdnFrosty]

This is not the same noise I have in the internal speaker. When audio is not present, you can hear what appears to be a pulsing such as that you would get from the CPU.

That hum you have would drive me even more nuts!

I am so mad right now. I just got this radio today and plugged in regular ear buds and there is a lot of white noise and it sounds horrible.

also, I plugged in the Vertex MLS-100 speaker and the hissing and the pulsing noise is the same and it is completely worse than the 536HP at this point. I am so shocked and can't believe it at this point. There is like this loud humming noise coming out of the external speaker. Also, I hear it coming out of the internal speaker too.

I never had this issue with any of my BCD996P2 series radios. *****This is a big major Problem*********

Attached is the link for LAPD. You can actually here the humming noise from the external speaker and it does not happen on any of my other radios. I always complained about this issue with the BCD536HP radios when they first were released and this SDS-200 Radio is even worse.

 

[bravo14]

I got my sds200 yesterday and I didn’t mess with it much wasn’t feeling good. I woke up 40 mints ago and I’m hearing a static noise it was loud enough to hear it when people out side putting a roof on.

 

[bravo14]

I turn off the unit and turn back on it went away 2 mints later it came back.

 

[ansky]

I started this poll to see if we can get a more accurate count of how many people are experiencing the noise (hum) issue with their SDS200.

 

[eaf1956]

I started this poll to see if we can get a more accurate count of how many people are experiencing the noise (hum) issue with their SDS200.

Does it matter? It's within spec.....

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[ansky]

Does it matter? It's within spec.....

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Did you watch the video "allend" posted? If that's within spec this thing needs to be taken off the market.

 

[W4ELL]

Pardon my ignorance on this issue... What are the conditions where this happens? Is this only heard through an external speaker plugged into the EXT. SP. jack on the rear of the unit? I haven't noticed a hum but I also haven't tried either of the output jacks (headphones nor EXT. SP.) on the unit at all.

 

[doctordialtone]

Some people have too much time on their hands...

 

[dfw1193]

I turn off the unit and turn back on it went away 2 mints later it came back.

Do you have the squelch level set properly, if it is at 0 this could result in what you are hearing the way you described it.

 

[wise871]

Some people have too much time on their hands...

Like yourself with a comment like that. If users have issues with there radios than let them discuss it. What’s it hurting you?


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[dfw1193]

I have read on these forums that those experiencing the hum are NOT hearing it when using the headphone jack, so you should be able to connect an amplified speaker to the headphone jack as a temporary fix. YMMV.

 

[dfw1193]

Did you watch the video "allend" posted? If that's within spec this thing needs to be taken off the market.

That is NOT HUM, that is audio from the cpu frequency oscillator (if it uses a multiplier) or an audio frequency created from the fpga chip when the unit scans, remember audio frequency range is 20hz through 28khz (or less for older) so if the scanner is scanning quickly at this range of cycles then its hearable with sensitive ears and somehow its bleeding into the audio amp ic chip, since thats what audio amp chips do they amplifier that frequency range, the reason it DOES NOT occur in the headphones in the headphone jack is the headphone output comes from the audio driver stage before the audio amp and this audio is not bleeding into the driver circuit just the audio amp circuit since it is so powerful of an audio amplifier.

 

[bravo14]

Do you have the squelch level set properly, if it is at 0 this could result in what you are hearing the way you described it.

I have my squelch at 2. I believe I had a bad card came with the radio. I put a new one in 10 mints ago seems working okay.

 

[mule1075]

Does it matter? It's within spec.....

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Nothing was said about the speaker being in spec. It was stated the keypad lighting was in spec.

 

[ColdnFrosty]

Internal and external speakers. Not on a headset plugged into the front panel.

Pardon my ignorance on this issue... What are the conditions where this happens? Is this only heard through an external speaker plugged into the EXT. SP. jack on the rear of the unit? I haven't noticed a hum but I also haven't tried either of the output jacks (headphones nor EXT. SP.) on the unit at all.

 

[ColdnFrosty]

I started this poll to see if we can get a more accurate count of how many people are experiencing the noise (hum) issue with their SDS200.

I would suggest changing the word "unbearable" to "unacceptable."

 

[dfw1193]

Excellent! Like I tell my cat ... Today is the day ... 4 hours to arrival!