Ham radio Interference

In article , Graham.
scribeth thus


"tony sayer" wrote in message
...
In article , Woody
scribeth thus
[snip]
BTW, the problem might even be down to nearby metalwork with corroded
joints acting as a rectifier, distorting the resulting amateur band
transmission current flow that would otherwise be totally harmless and
produce harmonics extending into the UHF band, directly interfering
with
the TV signal.


Another form of semi conductor

More found on radio comms sites...



I've long thought this to be an urban myth. I'm in my 40th year in the
mobile radio business and 31st as a field tech for a large part of which
I covered the whole of the north of England and north Wales and I have
never come across this problem.


It does happen .. especially on crowded shared sites with no bandpass
filtering or circulators etc..

Mind you the number of PMR shared sites is now in decline so perhaps not
as noticeable as it once was and sometimes it goes unnoticed and people
just put it down to interference..

Now a woman near Scarborough that could hear the local council depot
(which did not have a Tx on site) on her radio, cassette recorder,
microwave, toaster...........



Perhaps she was in need of some "attention"......

I can't think of any PMR system that would be resolved as intelligible
speech by simple demodulation.


Depends on how long go AM systems were quite fashionable sometime
ago..


Hover as this might have been -imaginary demodulation- ...

If it's not a broadcasting station, that only leaves amateurs, pirates
or
low flying aircraft.


--
Tony Sayer

In article , Johnny B Good
scribeth thus
The message
from "Bill Wright" contains these words:


"Len GM0ONX" wrote in message
...
Jeff wrote:
The truth is harsh but Jeff is right. Its almost certain that your
equipment is at fault. OFCOM can help with the TV by fitting high pass
filters but you may be on your own with the electric keyboard as it
should
designed not to pick up radio signals.

Hams will always take this view. I dare they are 90% right. But in my
experience anyone living in the sort of field strength generated by 100s of
Watts multipled by the gain of a long beam is inevitably going to have
problems. Every piece of electonic equipment they buy might suffer
interference, and how can Joe Bloggs be expected to fit caps across all the
transistor junctions in his new bit of kit?

I think it's time that the law was changed. When the present regulations
were made home electronics amounted to much less than they do now. It is
just plain antisocial to generate that sort of field strength if you
live on
in high density housing area. Anyone wanting to pursue their hobby
with that
sort of power should move house, to somewhere where there are no
neighbours.
The law should be altered so that no amateur can put more than a certain
field strength into any residential property except his own.

I'll leave it to others to point out why just about everything you've
just said here is so wrong. ;-)


Don't think its -wrong- as such, times have changed and Its not that
socially acceptable these days to be radiating what can be Kilowatts in
a built up area and seeing that some housing estates are like rabbit
warrens ...

Ofcom might well have something to say if you proposed to site a
Broadcast TX in the same location for instance;!...
--
Tony Sayer

wrote in message
...
How long before neighbours of amateur radio operators with large
antenna arrays (or those experiencing EMI problems) start to use this
tactic.

"Every night at bedtime my wife has a headache. It's that damned radio ham
next door!"

Bill

In article ,
tony sayer wrote:


Ofcom might well have something to say if you proposed to site a
Broadcast TX in the same location for instance;!...

consider Luton mf (visible from the M1) - built in fields, now with houses
all around.

--
From KT24 - in "Leafy Surrey"

Using a RISC OS computer running v5.11

"tony sayer" wrote in message
...
In article , Johnny B Good
Don't think its -wrong- as such, times have changed and Its not that
socially acceptable these days to be radiating what can be Kilowatts in
a built up area and seeing that some housing estates are like rabbit
warrens ...

Certainly as regards the fecundity of the inhabitants.

Bill

The UK has had radiation limits for many years; now, I believe,
incorporated into EU requirements.


They never have been enshrined in legislation, merely recommendations:

From the HPA (ex-NRPB) website:

"There is no UK legislation specifically requiring compliance with any EMF
protection guidelines."

73
Jeff

"Bill Wright" wrote in message
...

wrote in message
...
How long before neighbours of amateur radio operators with large
antenna arrays (or those experiencing EMI problems) start to use this
tactic.

"Every night at bedtime my wife has a headache. It's that damned radio ham next
door!"

Bill


You're lucky

Matron is / has a permanent headache

I was thinking for her beanyfit to relieve her of it

But if the truth was told that wouldn't beanyfit any one

All I HAVE to do is turn my Hearing aid off

All I NEED to do is go out and buy a hearing aid

;-))

DieSea

charles wrote:
In article ,
tony sayer wrote:


Ofcom might well have something to say if you proposed to site a
Broadcast TX in the same location for instance;!...

consider Luton mf (visible from the M1) - built in fields, now with
houses all around.

Yes...

"'Wiv a ladder and some glasses,
You could see to 'Ackney Marshes,
If it wasn't for the 'ouses in between."

wrote:

How long before neighbours of amateur radio operators with large
antenna arrays (or those experiencing EMI problems) start to use this
tactic.

....or even merely live next door?

This scenario was raised on ukra some years ago.

--

from
Aero Spike
Not a member of the RSGB for 50 years 1959 - 2009

"Norman Wells" wrote in message
...
charles wrote:

"'Wiv a ladder and some glasses,
You could see to 'Ackney Marshes,
If it wasn't for the 'ouses in between."

In Yorksher it doesn't sound right unless you put
"'Wiv a ladder and some glarsers,
You could see to 'Ackney Marshes,
If it wasn't for the 'ouses in between."

A Yorksher version might be

"'Wiv a ladder and some glasses,
You could see the M1 crashes
If it wasn't for the 'ouses in between."

On Listen with Mother they used to chant, archly,

"Ride a cock horse
To Banbury Cross"

Which rhymed perfectly, but round these parts the children would sing

"Ride a cock 'oss
To Banbury Cross"

which also rhymed perfectly. But it was a completely different rhyme!

Anyone still with me?

Bill