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 Ofcom to add EMF clause to ham radio licences

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STARSHIP
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeFri Apr 16, 2021 2:50 pm

New video to demonstrate the EMF calculator

RSGB Board Director and EMC Chair John Rogers, M0JAV has created a helpful video to demonstrate how to use the RSGB/Ofcom EMF calculator.

The calculator itself has also been updated on the RSGB website. https://rsgb.org/main/technical/emc/emf-exposure/

You can watch the video direct on the RSGB YouTube channel or via a link on the RSGB’s EMF web pages.
https://youtu.be/z9NYlQwbCZQ

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rabbi
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Call Sign : m3kbd/2e0kbd/m0kbd
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QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 61

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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeSat Apr 17, 2021 10:00 am

hi i have had a passion for radio all my life from school days i am 61 health wise i am in a bit of a mess passed all 3 exams and allso my wife i helped her  to gain a foundation licence  i worked as a lab technician in education for 15 yrs a lot has changed ham radio is my life its just another problem that makes life difficult and another head ache  i admit i find life difficult thanks for looking stay safe do radio 73s paul m0kbd

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MarcFX
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Call Sign : 26CT2627, M7ARQ, 2E0GKF
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Equipment Used : GrantII (Standard), CRT SS9900, FT817ND, UV5R (x2), GD-77 (x2), TYT UV9000E, ANYTONE AT-D578UV, I-COM IC-705.
Age : 59

radio - Ofcom to add EMF clause to ham radio licences - Page 3 Empty
PostSubject: The calculator...   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeSun Apr 18, 2021 9:17 pm

radio - Ofcom to add EMF clause to ham radio licences - Page 3 Calcul10

This is 10m band at 50w. I see no real reason for concern. The T2LT is basicly a dipole. Mine has an integrated feeder. I didn't cut it at the choke, I played out 7-8m then cut and put a plug on. It has about eight inches foldover at the top, for tuning. Someone mentioned linear loading but can't pretend I understand that!
It works really well on 10 and 11.

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Bean
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeTue Apr 20, 2021 8:56 am

http://rsgb.org/main/files/2021/04/PAC-1-HW-Dipole-160to40m-v1.0.pdf

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STARSHIP
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeSat Apr 24, 2021 9:03 am

EMF: RSGB release Pre-assessed Configuration for half-wave dipole
The RSGB has released the first in a series of Pre-assessed Configurations (PAC) which, if required, amateurs may choose to use to assist with the new EMF regulation

PAC-1 covers half-wave dipoles on the bands from 1.8 to 7.0 MHz (160m to 40m).

Note: The document presents “work in progress” on a complex subject that is still under development; details are subject to change and PAC-1 and referenced material may be updated or replaced.

Direct link to PDF  
http://rsgb.org/main/files/2021/04/PAC-1-HW-Dipole-160to40m-v1.0.pdf

Draft versions of Pre-assessed configurations will be posted on the RSGB EMF page as they are prepared, check  
https://rsgb.org/emf
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rabbi
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeSun Apr 25, 2021 6:19 am

hi my hf vertical antenna and my quad band colinear are on the chimney stack 40 feet above ground hf 80-6 and colinear 6-4-2-70cms i use at most 100 watts i also have an inverted l also max hight 40 feet it works poorly on 80-40 but i use it mostly for receiving with an rx atu so i will try and work the calculator to get a correct  reading thanks for looking stay safe do radio 73s paul m0kbd
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STARSHIP
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeSun Apr 25, 2021 9:17 am

Update on new Ofcom EMF regulations
As part of the RSGB AGM held on April 24, John Rogers M0JAV provided an update on the new Ofcom EMF licence regulations, the video is now available on YouTube

His presentation, which is followed by a question and answer session, starts at 2:14:25 into the AGM video.  

Watch The Radio Society of Great Britain 2021 AGM
https://www.youtube.com/watch?v=zhOuDrRLWIE&t=8065s

You can download the latest version of the RSGB-Ofcom EMF Calculator from the RSGB EMF page at
https://rsgb.org/emf

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G0RQQ
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Equipment Used : CRT2000 on CB, FT-920 on amateur bands; end-fed wire 20m long

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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeThu Apr 29, 2021 8:22 am

The bit I still haven’t got my head around is the percentage time transmitting in 6 minutes. The RSGB calculator defaults to 40%, but what figure should actually be used? 40%? 60%? 30%? For someone who is marginally compliant under the “10 watt EIRP maximum” exemption, this could be significant. You could do the calculations at, say, 40% and be compliant only to have someone from Ofcom say: “ You should use 60%....oooh look, you’re non-compliant now!”

Regards,
Keith G0RQQ

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Victor
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeThu Apr 29, 2021 8:55 am

I think the RSGB got it about right with a nominal 40%.

A typical SSB transmission is what, some 10% - 20% PEP? Maybe up to 50% with full processing.
An FT8 transmission is less than 50% and all things considered nearer 40% accounting for transmission 'overs'.
I don't yet know anyone making a constant 6 minute key down CW transmission. Wink

Most FM modes seem to occur at VHF/UHF where compliance seems easy and although 10m has FM I've yet to hear any transmissions on FM only ever having heard USB.

Yep, 40% is probably a bit of a high estimate in all reality so if you're compliant at that then I'd say you were good.  radio - Ofcom to add EMF clause to ham radio licences - Page 3 1f44d 


My main concern is that until now all my HF antennas were zig-zag dipoles in the loft space nicely hidden from public scrutiny. But my neighbour has since converted their loft into a bedroom putting them within my field. I can't presume when they are in there so will probably have to move my antennas now....

....nicely strung across the property for all to see!

That will cause me more 'stink' with my village neighbours than any EMF calculation would.  Rolling Eyes


All the best,
Victor
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G0RQQ
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Call Sign : 26CT866
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Equipment Used : CRT2000 on CB, FT-920 on amateur bands; end-fed wire 20m long

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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeThu Apr 29, 2021 9:31 am

There is some activity on 10 FM, although of course suitable propagation is needed. I use the HB9HD repeater in Switzerland on 29.55/29.65 as an indicator of any “lift.” Probably the most bizarre contact I’ve had through it is Lincoln to Bognor Regis...!

Anyway, that’s getting away from the thread of the posts.

Regards,
Keith
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STARSHIP
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STARSHIP

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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeWed May 19, 2021 9:58 am

Ofcom issue new amateur radio licence Terms and Conditions
On Tuesday, May 18, Ofcom confirmed the new EMF licence condition for Radio Amateurs and most other licenced radio users

Licensees need to comply with new rules by:
• 18 Nov 2021 for frequencies at or above 110 MHz
• 18 May 2022 for frequencies above 10 MHz but below 110 MHz
• 18 Nov 2022 for frequenciess at or below 10 MHz
See https://ofcom.org.uk/manage-your-licence/emf

The updated Amateur Radio licence Terms & Conditions with the EMF regulation can be downloaded from  
https://www.ofcom.org.uk/__data/assets/pdf_file/0015/214116/emf-amateur-licence-terms-and-conditions.pdf

A simplified version of the full guidance and specific advice for holders of Amateur, Ship Radio and Aeronautical licences will be made available by June 8, 2021 at  
https://www.ofcom.org.uk/manage-your-licence/emf/compliance-and-enforcement-guidance

With the RSGB-Ofcom Calculator it appears Foundation holders with HF stations using antennas such as a half-wave dipole, a longwire or a vertical should find the Average EIRP of their station for the FT8/SSB/FM modes is below 10 watts EIRP so they will not need to bother with a Compliance Distance. 

Similarly Foundation holders using 10 watts of 145 MHz FM to an omni-directional antenna with a gain of up to 4.5 dBi should also find their Average EIRP is below 10 watts, so again no need for a Compliance Distance.

With the RSGB-Ofcom calculator you just need to enter the Band, Mode, the Transceiver output power you use (e.g. 10 watts for Foundation), Coax type and length, and select an Antenna type, everything will then be calculated for you.  Take a screen snapshot of the results to keep as your EMF Assessment record.

A direct link to the RSGB-Ofcom calculator as of May 18, 2021, is at
https://rsgb.services/public/publications/emc/emf-calculator-v0.1.2-rsgb9e.xlsx

Check the RSGB EMF page for any new versions of the calculator as well as lots of other EMF information  
https://rsgb.org/emf
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ILikeRadioSoDoYou
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PostSubject: Re: Ofcom to add EMF clause to ham radio licences   radio - Ofcom to add EMF clause to ham radio licences - Page 3 Icon_minitimeWed May 19, 2021 12:05 pm

What I would like to know is if you print out your exclusion zone and keep it next to your radio does this all just disappear so you never have to think about it ever again ? Laughing
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