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Sangean HDT-1X "razzberry" problem

post #1 of 7
Thread Starter 
Hello: this is my first post, although I've been "lurking" for years over on the AVS HTPC forums, and recently here, where I took advantage of the wonderful manufacturer/consumer interaction to improve the HDT-1 and I am now a thrilled owner of one of the HDT-1X units, thanks to Master Theseus and the crew at Sangean.

First off, I was stunned at what a sensitive and selective conventional tuner it is! It's better than the tuner section in my Denon receiver. I live in a miserable "Bermuda Triangle" of bad RF reception, and I have a Winegard PR6010 omnidirectional FM antenna mounted on a 10-ft mast on top of my 2 story house (no, I don't want to deal with a directional antenna and rotor). I have always had unlistenable reception to a favorite NPR station, KPLU-FM, because of terrain limitations. I was amazed to tune it in, first hear the usual analog static, and then hear it switch to crystal clear HD. I assumed (incorrectly) that I'd need better reception to lock onto the digital bitstream. Great job!

Now, for the problem: I left it powered on since I installed it, for at least a week, and it's been working fine. This morning I turned on the amp, and the tuner was emitting a loud noise I can best describe as the "razzberry" tongue sound. I tried changing channels, but the sound remained. It was as if the microprocessor was hung and emitting the audio equivalent of the "blue screen of death". I power-cycled it and it's fine now. I should add, that it had been tuned into a very powerful Seattle station, broadcasting in HD, KUOW-FM, and I am using the analog (RCA) output, not SPDIF. I am just curious if anybody else has encountered this symptom?
post #2 of 7
I've had it on my HDT-1. If it tries to lock on to KNX-1070's HD before first locking on another HD station, it'll usually go into a digital loop that can only be cleared by power cycling.

Only solution I've found is to not let it lock to KNX when I first turn it on. Welcome to the world of the early adopter.
post #3 of 7
Quote:
Originally Posted by SteveInWA View Post

Hello: this is my first post, although I've been "lurking" for years over on the AVS HTPC forums, and recently here, where I took advantage of the wonderful manufacturer/consumer interaction to improve the HDT-1 and I am now a thrilled owner of one of the HDT-1X units, thanks to Master Theseus and the crew at Sangean.

First off, I was stunned at what a sensitive and selective conventional tuner it is! It's better than the tuner section in my Denon receiver. I live in a miserable "Bermuda Triangle" of bad RF reception, and I have a Winegard PR6010 omnidirectional FM antenna mounted on a 10-ft mast on top of my 2 story house (no, I don't want to deal with a directional antenna and rotor). I have always had unlistenable reception to a favorite NPR station, KPLU-FM, because of terrain limitations. I was amazed to tune it in, first hear the usual analog static, and then hear it switch to crystal clear HD. I assumed (incorrectly) that I'd need better reception to lock onto the digital bitstream. Great job!

Now, for the problem: I left it powered on since I installed it, for at least a week, and it's been working fine. This morning I turned on the amp, and the tuner was emitting a loud noise I can best describe as the "razzberry" tongue sound. I tried changing channels, but the sound remained. It was as if the microprocessor was hung and emitting the audio equivalent of the "blue screen of death". I power-cycled it and it's fine now. I should add, that it had been tuned into a very powerful Seattle station, broadcasting in HD, KUOW-FM, and I am using the analog (RCA) output, not SPDIF. I am just curious if anybody else has encountered this symptom?

I am sorry to hear of this problem. I don't believe I recall reading anything about this problem before and have already sent this information to the factory to see if this is a fixable problem. I have heard of a nother problem if you lock certain stations in before others. . . I believe an AM HD before an FM HD or something of that nature, but not this.

Thanks for the input and once I have an answer from the factory on this issue I will let you know.
post #4 of 7
Quote:
Originally Posted by Master Theseus View Post

I am sorry to hear of this problem. I don't believe I recall reading anything about this problem before and have already sent this information to the factory to see if this is a fixable problem. I have heard of a nother problem if you lock certain stations in before others. . . I believe an AM HD before an FM HD or something of that nature, but not this.

Thanks for the input and once I have an answer from the factory on this issue I will let you know.

This is what happens on my HDT-1 AND my Accurian -- about half the time -- if I try to receive AM HD before an FM HD station. If I receive an FM HD station first on either, it never happens.

Richard
post #5 of 7
Thread Starter 
It's interesting that some other folks have experienced this. The clue that it happens on 2 brands of tuner seem to suggest it's a software bug Ibiquity has to fix. >

I haven't hooked up the AM antenna, and I haven't even tried to use the AM band yet, so AM is not the problem for me. Is this something that happens when a station's signal temporarily drops out or fades below some threshhold? If / when it happens again, I'll try to note more detailed information. Thanks!

Unrelated question, but related to my comments about being able to lock onto a digital HD Radio signal, despite crummy analog reception: I have not experienced any stations drop out of HD mode yet; if they are broadcasting in HD, I receive it. Is there any intentional reduction in dynamic range or other compromise performed by the tuner when it is decoding a weak signal for HD Radio? Or, is it like ASTC HDTV, in that you either get the whole beautiful picture, or nothing? I noticed that weak KPLU-FM sounds rather compressed/limited, compared to other stronger HD stations (e.g. KJR, KUOW, Jack-FM), but that could very well be a product of what KPLU chooses to broadcast on their HD streams.
post #6 of 7
Quote:
Originally Posted by SteveInWA View Post

It's interesting that some other folks have experienced this. The clue that it happens on 2 brands of tuner seem to suggest it's a software bug Ibiquity has to fix. >

I haven't hooked up the AM antenna, and I haven't even tried to use the AM band yet, so AM is not the problem for me. Is this something that happens when a station's signal temporarily drops out or fades below some threshhold? If / when it happens again, I'll try to note more detailed information. Thanks!

Unrelated question, but related to my comments about being able to lock onto a digital HD Radio signal, despite crummy analog reception: I have not experienced any stations drop out of HD mode yet; if they are broadcasting in HD, I receive it. Is there any intentional reduction in dynamic range or other compromise performed by the tuner when it is decoding a weak signal for HD Radio? Or, is it like ASTC HDTV, in that you either get the whole beautiful picture, or nothing? I noticed that weak KPLU-FM sounds rather compressed/limited, compared to other stronger HD stations (e.g. KJR, KUOW, Jack-FM), but that could very well be a product of what KPLU chooses to broadcast on their HD streams.

My HDT-1x shows the same firmware v1.12BETA 1 as yours. I have not noticed the symptom you described but then again I have not been leaving it on full time nor listening to it much to have it happen and notice it. (Mainly because most of the HD broadcasts in the NYC area that I receive are not to my liking nor up to snuff quality wise (yet!), so I have not been listening to them much lately). I email a few of my desired stations about their quality problems... but none of them care to do anything to change it. Only 101.1 JACK FM (WCBS) responded and did some improving, but still boosts their highs a bit too bright because they want it loud like that. Sheesh! Not all engineers are into good sound. They do what their financial advisors and marketing directors tell them to do.

As for the HD signal, digital signal is either there or not there. So you would not experience any degradation or blending nor AGC effects like you would in analog mode. What you will experience is total drop out (silence periods) if the signal faded into the noise and the circuitry could not resolve the digital "bits" information. When the signal comes back, the music just pops back in. When it fades, the music stops. No in-between levels in digital. It's either on or off.
post #7 of 7
SteveinWA: WHat you are experiencing is the binefit of ditial HD Radio, the freedom from Multipath distortion. The analog suffers from having been bounced off buildings, hills and other things that degrades the signal. . Digital has that not.
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