Hi All,
You might like to take a look at the follow sites, when you have read the main posting below:
www.rsgb.org/emc/plt.php
www.elmac.co.uk/pdfs/whyPLTisbadforemc.pdf
For the technically minded, the latter is very informative, but even if your not technically minded, then it is still a very interesting document to read.
------------------------- Original Posting -------------------------
Hi All,
We thought that you would be interested in the following.
It is the text from an e-mail received from Neil, G7EBY, plus some additional comments from G3ZXX.
"Hi all,
After my first experiance of power line technology transmissions, recorded by a friend up in Bedford, myself and many others have become aware of the threat that the WHOLE HF band could and will be thwarted with nasty digital noise from 2-34 MHz, if the devices that provide home networking through the mains wiring are continued to be allowed to be sold.
M6ZAP (Paddy) is an affected user, give him a call (or me) on 'JB' to hear the dreaded noise.
Some units do notch our bands, (except 5MHz,) but the noise is still accross the broadcast bands and the rest of HF.
Ofcom have and are removing the devices from people's property's, FREE of charge. Yes folks, you don't have to pay a penny, if you are not the origionating source of the QRM!
The origional 'test' in a foriegn 'test house' failed them, but a second test in Germany, let them pass, because they were in standby mode! (Direct source of this information is on the www.UKQRM.org (website.)
This amazing new technology is NOT legal, but like LPD 433-434MHz trancievers and the like, has crept into our market without warning. Next will be broadcast FM no doubt!
The range can be quite astonishing, up to 1/4 of a mile in one case!
Anyway, if you just want to sign up and make your invisble voice heard on the petition site, here's the link, for what its worth: http://petitions.number10.gov.uk/SaveShortwave2/
The previous petition came back with an interesting response, stating that the devices SHOULD comply with the current regulations, of which they obviously don't.
This new petition is to enforce this even more, to an end that the government should and will remove these devices from the marketplace.
The fight continues.
www.ukqrm.org
Thanks for reading.
73 de Neil, G7EBY."
Although, as is indicated, some units notch some amateur bands, the interference does spread into the LF and HF ends of the bands, and although weak and not necessarily causing too many problems to SSB users, it is still be a major problem to users of Digital Modes, like myself, with noise spikes every 50Hz !
It is also impossible for me to attempt to listen to any short-wave broadcasts.
Question. Don't transmissions from legal broadcasters, like the BBC and BFBS, even if on the shortwave bands, come under the heading of a "protected service" ?
As with the first petition, I have signed this new one.
Whether or not you are directly effected, it is important that the authorities are obliged to enforce the Law and that these devices and anything similar are removed from the market, as well as from the users installation, where any interference is reported.
I also urge you to sign the petition.
Cheers & 73's
Dave, G3ZXX.
Note: The views expressed above are those of the individuals concerned and do not specifically reflect the views of any other individuals associated in any way with GB3JB.
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RV63 - Out 145.7875 MHz - In 145.1875 MHz - 103.5 Hz ctcss (G).
The system is located in South Wiltshire, in IO81vc, and provides coverage across South Wiltshire, South Somerset and North Dorset, with specific areas such as the City of Salisbury, Salisbury Plain, the Blackmore Vale and Cranborne Chase being well within its range. Coverage also extends, for fixed stations, across most of central and parts of North Wiltshire, Southern Dorset and West Hampshire, plus parts of North and West Somerset. See coverage map.
GB3JB is an analogue voice repeater, with no internet linking, simple intuitive logic and no bells or whistles. The beacon sends callsign and locator. The invitation to transmit is a single dit.
The simple rules for using GB3JB ....
(2) All users of GB3JB are expected to operate their station within the terms of their specific licence conditions and restrictions.
(3) When in QSO, please wait for the invitation to transmit (a single dit), and always leave a pause between overs' - always give others a chance to call-in.
(4) Please use good operating practices and procedures. Mobiles have priority. Remember, if a station calls in, during the gap between overs', always acknowledge them and please DON'T leave them sitting on the side, while everyone else has an over.
(6) If, under lift conditions, you wish to use another repeater on RV63, please turn off the 103.5 Hz ctcss tone, otherwise you will still access GB3JB.
(7) Remember that you are Radio Amateurs, using an Amateur Radio facility, so please use the appropriate operating practices and procedures.
Since you have taken the trouble to get an Amateur Licence, surely it's not to much to expect of you, that you use Amateur Radio abbreviation and accepted terminology, such as the Q-codes. We do not have a '20', we have a 'location' or 'QTH'. We do not have a 'personal', we have a 'name', etc., etc., If you still use CB, that's fine, no problem, BUT please leave the CB lingo for CB, and not when you use GB3JB or any other Amateur Radio facility or the Amateur bands.
(8) Ignore any idots - If you don't hear a callsign, do NOT respond - EVER !
