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Hytera Forum - Discussion forum for Hytera radio equipment. Questions concerning their use on amateur radio networks and frequencies belong in the Digital Voice for Amateur Radio forum.

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Old 05-09-2017, 8:43 AM
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Default PD982 Hiss when volume at 0

I use my PD982 at the office to monitor local repeater traffic and have to turn the volume all the way down all the way down sometimes when I get a phone call or I'm trying to talk to a co-worker. I've noticed that the even though I have set the CPS software Min Volume setting to Off that there is still a very noticeable hiss emitting from the radio. Does anyone know of a way to turn this off on the radio?
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Old 05-09-2017, 9:08 PM
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Do you have the latest firmware installed? 8.00.06.007 is the latest. I've see a discussion on this, might be in this forum so search back a bit. I've sold 1 PD982 but I didn't get a chance to even look at it before it went out. I have a PD782 but it does not have that issue.

Are you using the "always treble boost" or "LQO"? There is also digital and analog noise suppression defaulted on, you might try checking those off. I would figure these would only apply to RX but help text says RX and TX...go figure. The hiss is probably something to do with the DSP engine in the radio and some setting jacked up way too high.
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Old 05-09-2017, 9:19 PM
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Originally Posted by MSS-Dave View Post
Do you have the latest firmware installed? 8.00.06.007 is the latest. I've see a discussion on this, might be in this forum so search back a bit. I've sold 1 PD982 but I didn't get a chance to even look at it before it went out. I have a PD782 but it does not have that issue.

Are you using the "always treble boost" or "LQO"? There is also digital and analog noise suppression defaulted on, you might try checking those off. I would figure these would only apply to RX but help text says RX and TX...go figure. The hiss is probably something to do with the DSP engine in the radio and some setting jacked up way too high.


I don't have the always treble boost on. I'll try these settings and see what I can come up with. The firmware I have it 8.01.02.003 not sure if this is newer than 8.00.06.007? Thanks for the info!!!


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Old 05-09-2017, 9:43 PM
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I don't have the always treble boost on. I'll try these settings and see what I can come up with. The firmware I have it 8.01.02.003 not sure if this is newer than 8.00.06.007? Thanks for the info!!!


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OK, you have the very latest then. I just got that version from Hytera 2 days ago to address a new XPT site I am building. Thought it was still available only to dealers but maybe not. Wish I had a 982 radio to test with. I'd go through ALL of the RX gains I could find to see if anything would change with adjustment. Just make sure you save the CP as you have it now so you can easily go back.....
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Old 05-09-2017, 10:43 PM
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Quote:
Originally Posted by MSS-Dave View Post
Do you have the latest firmware installed? 8.00.06.007 is the latest. I've see a discussion on this, might be in this forum so search back a bit. I've sold 1 PD982 but I didn't get a chance to even look at it before it went out. I have a PD782 but it does not have that issue.

Are you using the "always treble boost" or "LQO"? There is also digital and analog noise suppression defaulted on, you might try checking those off. I would figure these would only apply to RX but help text says RX and TX...go figure. The hiss is probably something to do with the DSP engine in the radio and some setting jacked up way too high.
Tried to disable the settings you recommended, no dice. :/ See attachment below
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Old 06-09-2017, 6:39 AM
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I mentioned this thread to my friend who works at Hytera. He tells me this hiss is normal. It's just how they work.
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Old 06-10-2017, 10:38 AM
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I mentioned this thread to my friend who works at Hytera. He tells me this hiss is normal. It's just how they work.
I own some PD982 radios and they all behave like that. The audio is LOUD when you crank the volume up. No problem hearing the radio in loud environments. I recall the audio output is spec'd at 2.5W (rated @ 5% distortion?). That's a LOT of output from a handheld radio. That also means the audio amp stage(s) have high gain. What you are hearing is the analog audio noise floor when the volume is at 0.

It's normal with a PD982.

The PD982 is an awesome radio.


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Old 07-12-2017, 8:10 AM
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Quote:
I mentioned this thread to my friend who works at Hytera.
Its possible to send me all datasheeds who available for my Hytera Radio?
The German / European Hytera Company dont reply.
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Old 07-15-2017, 11:46 PM
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My 982 has a bit of hiss on the tone as I change channels but nothing after that.
I upgraded to 8.01.03.005 to get the single freq repeater license to load.
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Old 07-17-2017, 10:25 AM
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Originally Posted by speedway_navigator View Post
My 982 has a bit of hiss on the tone as I change channels but nothing after that.
I upgraded to 8.01.03.005 to get the single freq repeater license to load.
You will have the hiss whenever the audio amplifier stage is enabled. One thing I notice with my PD982 is that you have to crank the volume control way up before you get audio beyond the hiss. You get nothing nothing nothing and then loud as you crank the volume up. I do like how loud the audio is at high volume levels in noisy environments.

How expensive is the SFR license? I have V8.01.03.005 FW and the SFR and recording options are greyed out. I have a TF card (micro SD card) installed.

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Old 07-17-2017, 10:57 AM
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List price is $100 for SFR. The recorder feature is $50.

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Old 07-17-2017, 5:29 PM
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List price is $100 for SFR. The recorder feature is $50.

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Thanks.

I think the hiss people are reporting when the volume is at 0 is the noise floor of the audio input to the audio amp. It is present whenever the audio output is enabled. I suspect it is noise from digital circuitry getting into the audio path to the audio amp. I don't think updating the firmware will fix it. Absolutely love the radio though.



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