Re: Signal quality

On Tue, 03 Jul 2007 03:14:55 -0700, zikkimalambo@xxxxxxxxxxxxxxxxx
wrote:

On 2 Jul, 15:09, Madden <mad...@xxxxxxxxx> wrote:
On Sun, 1 Jul 2007 19:27:21 +0100, "Bill Wright"

<insertmybusinessn...@xxxxxxx> wrote:

"Madden" <mad...@xxxxxxxxx> wrote in message
news:duhf83d982bm17lieqjb25c6o47n2c26p5@xxxxxxxxxx
On Sun, 01 Jul 2007 15:54:33 +0100, Madden <mad...@xxxxxxxxx> wrote:
Sorry, I know it's bad form to reply to ones own post but I got the
figures of the signal strengths completely wrong.

We'll forgive you. Tree screening will typically affect one channel more
than another. The effect will often vary by channel and time in a seemingly
random manner.

There's a thing on my website somewhere about trees.

Just a quick update....
I went into the loft to check the aerial connections for corrosion and
there was, indeed, some rust on the terminal screws.
Got the Missus to stand downstairs and watch the Thomson signal
quality whilst I did the business in the loft.
I unscrewed the cable terminals and removed the coax, expecting to
hear a call about lack of signal.
Nothing.
According to my wife, the signal was still strength 5 and quality in
the yellow and fluctuating between 5 and 7.
I shorted the cable and still the same.
I remade the connections and went down to the TV.
Whilst messing with the TV socket I found that wiggling the short
cable between the socket and the receiver, signal quality lept to 8
and steady whilst signal strength stayed at 5.
I replace this short cable and all is now well.
Except.
I come to the conclusion that I have been running all this time on the
signal picked up by a 20 foot length of 30 year old coax running up
the cavity wall!!

Can't see how you come to that conclusion.

From what you have said here, there was an aerial in the loft
connected to a piece of coax running down the cavity wall. If the
lead downstairs was a good un (and presumably it was for most of the
30 years), then you (or at least the TV) were connected to the
aerial. When the lead went dud (last week??), then the TV was just
connected to that lead and not to the aerial or 20 foot of coax. I
can't see from you r post, that the TV was connected to just the lead
without the aerial at any time.

Have you tried disconnecting the aerial from the lead now that you
have the connection made correctly downstairs? That would give a
better indication of how it would work without an aerial (though
perhaps you'd need to take the aerial out of the loft as well??

Have I misunderstood something?

Maybe.
I suspect the fault with the short lead was perhaps a dry joint as the
signal strength was OK, (normal for my setup), and only the BBC was
effected by loss of quality, (Signal to Noise?)
With only the known good short lead connected and not attached to the
wall plate then no signal at all so the coax at least was needed for
some sort of picture..
With the lead attached to the wall plate and thus to the 20 foot of
old coax, signal strength 5 and quality 8-9 over all muxs.
Signal strength has never been more than 5-6 in the two years or so
that I have had the tuner.
I must admit I haven't ventured into the loft again to check whether
the aerial is now actually doing anything, but I suspect that it is
totally the wrong aerial for digital from Tacolnston and so is
probably as useful as a wire coathanger.
On the theory well proven by experience that if it ain't broke, don't
fix it, unless I have further problems I'll just leave it alone.
If it goes pear shaped again, I'll get a proper aerial recommended for
digital reception in mid Norfolk, some good quality coax and re-rig
the lot.

--
Madden
.

Relevant Pages

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  • Re: Signal quality
    ... figures of the signal strengths completely wrong. ... quality whilst I did the business in the loft. ... I unscrewed the cable terminals and removed the coax, ... I remade the connections and went down to the TV. ...
    (uk.tech.digital-tv)
  • Re: OT: PLASMA, LCD, OR REAR PROJECTION?
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  • Re: Cable Modem Problem..
    ... It's synchs at full speed on reboot and as it experiences transmission error it steps down to a lower speed. ... The tech at the other end may only be able to measure signal strength which is not sufficient to determine quality, so you may have to schedule a field tech to come out to your house to measure line quality at the entry point to your house. ...
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