I bought these Phillips units as I did not want the latency on bluetooth and
others. However because they are analogue you can hear distortion at low
levels and hiss going up and down. Would this be normal for such devices, or
might it be something interfering with the of signal. It has two frequency
settings but not much to chose between them.
Brian

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On Wed, 19 Oct 2022 09:19:03 +0100, "Brian Gaff"
<brian1gaff@gmail.com> wrote:

>I bought these Phillips units as I did not want the latency on bluetooth and
>others. However because they are analogue you can hear distortion at low
>levels and hiss going up and down. Would this be normal for such devices, or
>might it be something interfering with the of signal. It has two frequency
>settings but not much to chose between them.
> Brian

I'm not familiar with them, but it is possible they use analogue
companding to keep noise levels low. That would account for the
variable noise level. Also in the UK the 800MHz band is very close to
that used by LTE mobile data. That will do unpleasant things to
signals, particularly analogue ones.

Also possibly, of course, this is just what they do.

d

Yes, but this sort of phones has been around for many years. I can in fact
pick them up at around 864Mhz, and the frequency sounds quite clear on my
scanner. I think they are using a system like fm radio uses, IE a
subcarrier, and that might explain the his and distorted low levels. If you
tune any fm station with a weakish signal on a radio its much more noisy
and suffers more from burbles etc. I suspect I'm expecting a little too much
from an analogue device. I have heard a very good set of German design, and
they apparently use a system similar to the old Nicam tv sound which is
digital, and work well, but are pretty expensive.
Brian

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"Don Pearce" <spam@spam.com> wrote in message
news:634fb6db.173375@news.eternal-september.org...
> On Wed, 19 Oct 2022 09:19:03 +0100, "Brian Gaff"
> <brian1gaff@gmail.com> wrote:
>
>>I bought these Phillips units as I did not want the latency on bluetooth
>>and
>>others. However because they are analogue you can hear distortion at low
>>levels and hiss going up and down. Would this be normal for such devices,
>>or
>>might it be something interfering with the of signal. It has two frequency
>>settings but not much to chose between them.
>> Brian
>
> I'm not familiar with them, but it is possible they use analogue
> companding to keep noise levels low. That would account for the
> variable noise level. Also in the UK the 800MHz band is very close to
> that used by LTE mobile data. That will do unpleasant things to
> signals, particularly analogue ones.
>
> Also possibly, of course, this is just what they do.
>
> d