[mythtv-users] (off topic a bit) 2 input HDHomeRun vs 1 input HDHomeRun Dual

[Douglas Peale]

On 09/08/2013 11:00 PM, Joseph Fry wrote:
>>>> Does anyone know if Silicon Dust upgraded the tuner when the switched from
>>>> the 2 input model to the single input dual?
>>>> I was watching the Americas cup today, and noticed that while my
>>>> Centronics ZAT 502HD was able to tune NBC with no dropouts, the
>>>> HDHomeRun was getting zero signal quality tuned to the same station
>>>> connected to the same antenna with the same signal strength.
>>>> Even though I have a direct line of site to the transmitter, it is over
>>>> San Francisco bay, and on hot days the signal spectrum
>>>> gets badly distorted (exactly like multi-path).
>>>> I'm wondering if it would be worth it to upgrade my old HDHomeRun tuners.
>>>> Do the new ones handle multi-path any better?
>>>
>>> This can also be a sign of the power supply (wall wart) going out.  My Gen 1
>>> HDHR started acting up with tuning problems and greatly fluctuating signal
>>> and quality.  I pulled opened up the wall adapter and found several swelling
>>> capacitors.  I swapped them out and it's been fine ever since.
>> Or, even easier, just contact Silicon Dust... they issued replacement
>> wall warts for the Gen 1 due to known issues.  And I had the exact
>> same issue with strong signal, but no quality.  I think as it goes bad
>> it has a problem with powerline noise, or something, and perhaps you
>> see the problem on hot days due to air conditioners causing noise on
>> the power lines, or something like that.
>>
>> Either way, I would contact SiliconDust and see if they are still
>> offering replacements... it may fix your problem... it may not.
> Oh... they used to have a page dedicated to ordering replacements...
> the page is gone but I found the text from it at another site:
>
> [quote]
> SiliconDust is offering replacements for the SW20-S050-15 power adapter shown.
>
> A failing power adapter may result in one or more of the following symptoms:
>
> Flashing power light on the HDHomeRun or failure to power on.
> Flashing red light on power adapter.
> Zero signal-to-noise quality (snq) on all channels.
>
> If your HDHomeRun included this power adapter please see this page for
> a replacement power adapter.
> [/quote]
>
> just submit a trouble ticket: http://www.silicondust.com/support/troubletickets/
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The power supples on both of my HDHomeRuns failed a few years ago. I am currently using an old AT power supply to power them. I
know the issue is not a power supply issue as I have watch the spectrum of my received signals decay and recover on a hot day on
a spectrum analyzer. The spectrum can change from a perfect square profile to one with a 15 dB notch over the course of several
hours.
I have a plot showing the decay of spectrum over about half a day, 59 kB PDF, but I don't know the rules about attachments on
this mailing list, and it is rather off topic.

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