Topband: Beverages and Noise

[CUTTER DAVID]

There are some interesting things going on in the Cross Country Wireless group with phased loops.  Look for Simon about half way down this link:
https://groups.io/g/CrossCountryWireless/topic/79362931#7537

He tells us that he works across the pond on his multi-turn transmit loop and now has 4 phased loops for receive working very well in his crowded London area. 

David G3UNA/G6CP


> On 04 January 2021 at 12:33 Paul Mcl <paul.mcl at gmail.com> wrote:
> 
> 
> Roger,
> 
> It’s not just the VDSL noise but the SMPSU’s as well that give me grief
> round here.  VDSL affected 30m most as I have overhead poles in my back
> garden so limited option to escape.  VDSL cabinet was a street away.
> 
> I found the RX loop (Wellbrook) worked poorly near the house and put it
> outside where it performed much better also with a rotator but agree EW
> would be my preference if I had to choose a fixed position.
> 
> I also tried with 2 short terminated beverages each 40m long running along
> a garden wall EW. They worked ok and complimented the RX loop to give me
> better coverage.   I can’t say they were excellent as comparing in a noise
> free option was a choose but I used them for a couple of seasons before I
> changed to remote RX in a field a couple of hundred metres away using a
> WiFi link where I put out 2 x 200m long beverages in a lot quieter location.
> 
> It might vary at your QTH but worth trying as putting up a short beverage
> temporarily to try as it won’t break the bank.
> 
> Regards
> 
> Paul MM0ZBH
> 
> 
> 
> On Mon, 4 Jan 2021 at 12:03, Roger Kennedy <roger at wessexproductions.co.uk>
> wrote:
> 
> >
> > The major source of noise on Top Band (and 80 & 40m) here in Britain these
> > days comes from VDSL Broadband hash. The problem is that almost every house
> > has an overhead copper phone line going to it . . . so the Service Provider
> > runs Fibre-optic lines to a Cabinet in the street . . . but then uses the
> > ordinary un-screened cables phone cables that run up the wooden Telegraph
> > Poles, then across to about ten houses . . . and the same all along the
> > street.
> >
> > Those phone wires act as fantastic antennas radiating the hash! I have
> > found
> > with my 160m Mobile setup that you have to get a couple of miles from any
> > phone wires before the noise level starts to drop - which is almost
> > impossible !
> >
> > I have been told that the Service Providers COULD turn off the carriers
> > that
> > are in the various Amateur Bands, which would eliminate the problem . . .
> > but they refuse to do so, as that would obviously reduce customers'
> > broadband speeds.  Despite numerous complaints to the Regulator (OFCOM)
> > nothing has been done, as the Service Provider denies that there is a
> > problem !
> >
> > Many people have S9+ noise levels from the VDSL . . . I'm lucky in that
> > this
> > is a new street, so the phone cables are underground . . . but there are
> > still overhead wires at the end of the street, 100 yards away, which gives
> > me an S6 noise level in an SSB bandwidth. (my Receiving Loop in the loft is
> > turned to null out the noise, but only drops it about 6dB . . . fortunately
> > that's pointing East-West, which is a pretty good direction for most DX)
> >
> > So my question is this . . . surely even a Beverage is going to pick up
> > this
> > hash, as it will always be pointing at some phone wires?
> >
> > I know very few British Topband DXers can put up a Beverage, as most of us
> > have pretty small gardens (myself included, so this is a purely academic
> > question) . . . but would be interested to hear any comments.
> >
> > Roger G3YRO
> >
> >
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