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 69 LPD FM voice channels on 70cm
 2E0JTP   Quote Post
Posted: Aug 13 2008, 10:43 AM Post #3226 
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We now have to share the 70cm band with LPD433/434 walkie talkies.

Up until now we only shared it with data/telemetry signals, it would appear that Ofcom have changed the requirement document (IR2030) and it now allows FM voice transmissions at 10mW.

FM Voice, 10mW with a 10% duty cycle (5% Talk, 5% Receive, 90 Standby).

user posted image

You will notice that not only does this conflict with the 70cm FM simplex frequencies, it also conflicts with repeater inputs and outputs.

Further details on LPD (Low Power Devices) can be found here: Ofcom SRD information page (Short Range Devices).

The specific Ofcom document in question is:

IR2030

I was a little uncertain about the wording, so I emailed Rod Wilkinson at Ofcom. His response was:

QUOTE

Jon,

Further to my recent holding response we are able to advise you as follows:

The IR2030 table 3.1 and associated note (i), defines use in the 433 MHz band for 10 mW e.r.p. devices as; either a limitation of a 10% duty cycle (433.05 to 434.79 MHz band)  or, in the band 434.04 to 434.79 MHz, the option for Music and Speech only if digitised, without a limitation on duty cycle (though with the channel bandwidth of 25 kHz).

For 1mW e.r.p. devices (433.05 to 434.79 MHz), music and speech is permitted only if digitised.

The duty cycle means the ratio of time during any one-hour period when equipment is actively transmitting.

We trust this helps.

Rod Wilkinson
OLC Senior Associate, Amateur Radio
[Removed email address and phone number - Jon]


Ofcom
Riverside House
2a Southwark Bridge Road
London SE1 9HA
020 7981 3000
www.ofcom.org.uk


Strange that such a fundamental change hasn't been made in a clearer manner or even been publicly announced...

So, the next time you hear voices on any of the above channels and they aren't using call signs or are transmitting on a repeater output (or god forbid an input), you know that they are perfectly legal and are allowed to be doing so. blink.gif

Makes you wonder why we even bother using call signs any more.
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 Theo D Lite   Quote Post
Posted: Aug 13 2008, 12:23 PM Post #3228 
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Well spotted. I hadn't been aware of this and I suspect many others weren't. Don't recall seeing anything in RadCom either!

The only saving grace is that with those powers we should be able to go right over them just like we do we key fobs which was the main reason for the Bristol 70cm repeater moving frequency.

I'm not clear on what or how they will be used though. Will have to go away and read a bit I guess.

73
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 Andy   Quote Post
Posted: Aug 14 2008, 08:38 AM Post #3230 
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Just transmit over them, they'll soon give up and go away. After all, they're only flea-power and you didn't hear them, right? mad.gif
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 2E0JTP   Quote Post
Posted: Aug 14 2008, 10:22 AM Post #3232 
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Still, it's a damn unpleasant position to be put in. sad.gif
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 2E0JTP   Quote Post
Posted: Sep 29 2008, 02:57 PM Post #3317 
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Ofcom have released an updated IR2030 document

http://www.ofcom.org.uk/radiocomms/ifi/tec...IR2030final.pdf

It seems to revise the rules to only legally allow 10mW on channels 40 to 69.

That's OK then, that's only the repeater INPUTS. blink.gif
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 2E0JTP   Quote Post
Posted: Oct 7 2008, 02:35 PM Post #3338 
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Ofcom have officially had the legislation on this changed now. As of the 1st of October 2008.

QUOTE
Statutory Instruments
2008 No. 2426

Electronic Communications
The Wireless Telegraphy (Exemption) (Amendment) (No. 2) Regulations 2008

Made

10th September 2008

Coming into force

1st October 2008

The Office of Communications (“OFCOM”) make the following Regulations in exercise of the power conferred by section 8(3) of the Wireless Telegraphy Act 2006(1) (the “Act”).

Before making these Regulations, OFCOM have given notice of their proposal to do so in accordance with section 122(4)( a) of the Act, published notice of their proposal in accordance with section 122(4)(B ) of the Act and have considered the representations made to them before the time specified in the notice in accordance with section 122(4) of the Act.
Citation and commencement

1.  These Regulations may be cited as the Wireless Telegraphy (Exemption) (Amendment) (No. 2) Regulations 2008 and shall come into force on 1st October 2008.
Amendment of the Wireless Telegraphy (Exemption) Regulations 2003

2.  The Wireless Telegraphy (Exemption) Regulations 2003(2) shall be amended in accordance with the following provisions of these Regulations.
Amendment of regulation 3

3.  In regulation 3 (interpretation), in paragraph (1), in the definition of “relevant apparatus”, for “Schedules 3 to 10” substitute “Schedules 3 to 11”.
Amendment of Schedule 5

4.  In Schedule 5 (land mobile-satellite service stations), in Part III (interface requirement) for “published by OFCOM in April 2006” substitute “published by OFCOM in September 2008”.
Amendment of Schedule 6

5.  In Schedule 6 (short range devices), in Part III (interface requirement) for “published by OFCOM in November 2006” substitute “published by OFCOM in September 2008”.
Addition of Schedule 11

6.  After Schedule 10 (citizens’ band radio equipment) add the following Schedule—

Regulation 3(1)
“SCHEDULE 11 HIGH DENSITY FIXED SATELLITE APPLICATIONS
PART I Interpretation

In this Schedule “prescribed apparatus” means apparatus described in the Interface Requirement referred to in Part III of this Schedule.
PART II Additional Terms, Provisions and Limitations

The prescribed apparatus shall be subject to and comply with the Interface Requirement referred to in Part III of this Schedule.
PART III Interface Requirement

IR 2066 - UK Interface Requirement for High Density Fixed Satellite Applications published by OFCOM in September 2008.”

Ed Richards

Chief Executive of the Office of Communications

For and by authority of the Office of Communications

10th September 2008
EXPLANATORY NOTE

(This note is not part of the Regulations)

These Regulations amend the Wireless Telegraphy (Exemption) Regulations 2003 (S.I. 2003/74) (the “principal Regulations”).

Schedule 5 of the principal Regulations is amended to refer to the updated IR 2016 which makes provision for land mobile-satellite service stations.

Schedule 6 of the principal Regulations is amended to refer to the updated IR 2030 which makes provision for short range devices. This amendment also ensures compliance with Commission Decision 2008/432/EC of 23rd May 2008 amending Decision 2006/771/EC on harmonisation of the radio spectrum for use by short-range devices (OJ No L 151, 11,6,2008, p. 49).

These Regulations also provide for a new exemption from wireless telegraphy licensing for high density fixed satellite applications through the addition of a new Schedule 11 to the principal Regulations.

Copies of IR 2016 and IR 2030 referred to in the principal Regulations and IR 2066 referred to in these Regulations may be obtained from OFCOM at Riverside House, 2a Southwark Bridge Road, London SE1 9HA and are available on the OFCOM website at http://www.ofcom.org.uk.

A full regulatory impact assessment and report of the effect that these Regulations will have on the costs to business is available from the OFCOM Library at Riverside House and the OFCOM website. Copies of the regulatory impact assessment have also been placed in the libraries of both Houses of Parliament.


Original Document: http://www.opsi.gov.uk/si/si2008/uksi_20082426_en_1

IR2030 Document: http://www.ofcom.org.uk/radiocomms/ifi/tec...IR2030final.pdf


--- --- ---



To summarise:

Licence free, voice communications are now perfectly legal on the following LPD channels at the indicated power levels (WHEN USING 'TYPE APPROVED' LPD RADIOS ONLY):

LPD channels 1 (433.0750) to 39 (434.0250) at 1mW

LPD channels 40 (434.0500) to 69 (434.7750) at 10mW
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 G7MRV   Quote Post
Posted: Jan 26 2009, 03:44 PM Post #3494 
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sadly, we are but secondary users on 70cm, and there are a lot of other official users.

It is annoying that these things are on the same frequency allocations as our repeaters, but its a europe wide harmonised allocation.

The advantage we have, is that we are not tied to a rigidly regulated plan. If these things become a problem, then we just have to move the repeaters off of the affected channels and go into the 12.5kHz channels either side. Of course, this in itself leads to problems, such as the immediate neighbouring channels already being occupied, a redesign of the bandplan, and the expense of retuning the radios and filters of the repeaters.

Then allocate the affected channels for high power digital modes....


dont think that the 10mW limit will protect us, very soon illegal highpower radios will be in the country, just as they are on 446MHz. Our best bet is to vacate the effected frequencies save for digital modes, after all, 70cm is a big band with plenty of room
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 M3HIM   Quote Post
Posted: Jan 17 2012, 10:00 AM Post #4356 
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Félim M3HIM
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