NARC Badges

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Published: 26 May 2022

Last Updated: 26 May 2022

Hi all we have a number of badges collecting at NARC.

M0NCG 2E0YRU M0IVS
M6IIZ M0MAM M0MTW
M0WTG G7ETC M6PZY
M7BLX M7LLS M7BAZ
2E0NLK M7GMD M0OEB
M6LGT 2E0GJU 2E0PFG
M6HYQ M7ACG M6DPZ
M6VWN G0JSG M0PTO
G4ZIC

We will take them to Barford also if not collected from our next
meeting on the June 8th at CNS of if
you would like them posted please contact This email address is being protected from spambots. You need JavaScript enabled to view it..

Ian GM3SEK Filter kit - Where to buy and NARC Member feedback...

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Published: 18 January 2022

Last Updated: 16 February 2022

Need Filter parts?  

(This article is also updated with members feedback lower down)

Several people have asked where they can buy parts from for the Filter kit, either because they missed the NARC bulk buy in December, or they want to buy a few extra parts.

The article as described on NARC Live was recorded and the recording can be seen here:

https://www.youtube.com/watch?v=LVTuBsj3U0o

Ian's GM3SEK website with excellent projects - scroll down for the Filter project including the complete slide set of the presentation which shows construction in more detail.

https://gm3sek.com/

The following are the main components of the kit as specified by Ian along the suppliers you can buy them from which are either used by Ian and or myself when I organised the NARC bulk buy. They are not necessarily always the cheapest supplier, but they are consistent suppliers and all parts are in stock as I write this on 18.1.22.

73 de, David G7URP

Enclosure

CE-TEK GR17012             Suggested supplier: www.cpc.co.uk       CPC code EN84544

https://cpc.farnell.com/ce-tek/gr17012/abs-enclosure-170x170x75mm-ip65/dp/EN84544?CMP=TREML007-003

Cable Gland (2 per kit)

ProPower PG-11 Black                     Suggested Supplier: www.cpc.co.uk      CPC code PG-11 Black

https://cpc.farnell.com/pro-power/pg-11-black/pg11-cable-gland-black/dp/CBBR7352

Mains filter

Schaffner FN2030-16-06                  Suggested supplier: Mouser.co.uk   Mouser code: 631-FN2030-16/06

https://www.mouser.co.uk/ProductDetail/Schaffner/FN2030-16-06

Main Ferrite 

Fair-Rite core 0431177081                 Suggested supplier:  Mouser.co.uk   Mouser code: 623-0431177081

https://www.mouser.co.uk/ProductDetail/Fair-Rite/0431177081

Smaller Ferrite (2 per kit)

Fair-Rite core  2643167851                Suggested supplier:  Mouser.co.uk   Mouser code: 623-2643167851

https://www.mouser.co.uk/ProductDetail/Fair-Rite/2643167851

Tip: Label your Ferrites with their part numbers as soon as you receive them as they look identical to others yet perform very differently!

Cable

High temperature flex such as 3093Y 2.5mm is recommended for the filter and this is available from several sources online and locally, eg Screwfix supply 5m lengths as below for collection from a local branch and you will need at least 3m for the filter as described.

https://www.screwfix.com/p/time-3093y-white-3-core-2-5mm-flexible-cable-5m-coil/80786

Cable update 3.2.22:

Thanks to John 2E0TWQ who shares that Screwfix are currently out of stock but he found it available on eBay under item number 202336536417

David G7URP's buying notes

Note that Mouser has warehouses in Germany and USA but currently if you order over £45 shipping is free and VAT prepaid - the £45 should be exceeded if you purchase the mains filter and ferrites from them all at once.

This information was my experience and is offered in good faith but neither NARC or I can accept responsibility for any errors or problems ordering parts or performance of the filter etc.

David G7URP     18.1.22

NARC Members additional feedback on the Mains filter which came in after the show...

From John 2E0TWQ:

A very useful video showing how to make the filter:

https://www.youtube.com/watch?v=ECogK3pCp28

And a surplus filter which might be useful as found on eBay but the seller has a large quantity:

https://www.ebay.co.uk/itm/361843251381

From Ralph 2M0RHT

I attach photos which I hope help others. It works for me so I must be doing something right. A bit of experimentation does no harm. For me, the + and - go through the filter therefore the earth should do the same. Therefore I constructed my filter as per the photo. Hope this helps others.

From Malcolm G3PDH:

David,  a very interesting discussion on Wednesday.  

Just to reiterate my points, Firstly there seemed to be debate on some reflectors about which way round the metal can filter went.  I assumed that LINE was the mains in and LOAD the output to the toroidal and output.   
My mains earth connects through from the earth tag on the can filter to the cables going around the toroids and to the mains output from the filter.  I have not connected that earth to anywhere else such as an external earth.
A definitive circuit diagram would be useful and confirmation as to the direction of the can filter.
As I said I don’t seem to have any mains borne interference but decided to keep it in circuit as good engineering practice and it could help with any RF going back into the mains from the TX, particularly the Linear Amp.

From Bob G7JTZ:

Join us in 2022! Special reduced online membership rate

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Published: 16 December 2021

Last Updated: 29 January 2022

In this current climate, we hope you will appreciate that we cannot make specific plans for when we can start meeting back at CNS school.

Although NARC currently has reduced costs, as a club we still have some financial commitments to consider and meet, such as insurance and RSGB membership as well as essential equipment servicing and maintenance. With this in mind, the committee has decided to make the 2022 membership fee just £5 across the board for anyone for the year which should cover our reduced costs.

This will be the NARC "Online Membership” and we invite you to rejoin now, because in the future when we do start to meet again and have the significant additional costs of room hire etc our membership fees will immediately revert to the normal rates.

Club Contesters

And if you are a contester remember you need to be an up to date member to enter valid scores into the club championship contests.

So we invite you to rejoin (or join) NARC now for 2022 and pay us ideally by direct bank transfer (be sure to use your callsign/surname as reference) - please also complete and email the membership form if you are not already current member.

(NB - As Mark asks please pay by BACS bank transfer if you possibly can because even though we are a voluntary organisation Paypal still take a significant commission along with the bank which also charges for each Cheque payment)

Details are below or see:

http://norfolkamateurradio.org/index.php/membership/join-us

Mark G0LGJ - Treasurer

(After discussion and agreement by committee)

We welcome new members of any age, gender, and ability, from complete beginners to licensed amateurs.

(Not regularly meeting during the current Covid-19 pandemic )

2022 Membership 

£5 which is classed as our online membership and is a special rate for all membership levels only while the club does not physically meet.

Conditions that qualify a member for concessionary membership can be found in the constitution or shown on the form

If you are a current paid-up member you do not need to complete the form again, but just pay your annual subscription using the methods below.

Ways to pay:

Pay directly to our Bank Preferred

Bank: HSBC
Name: Norfolk Amateur Radio Club
Sort Code: 402008
Account: 31432222 (this is classed as a business account - some banks ask)

IMPORTANT - please use your callsign as the reference or if you are not licensed your initial and surname and email the treasurer as below

OR

Cheque Payable to "Norfolk Amateur Radio Club"
Please use BANK Transfer if possible as banks charge us for each cheque

Posted to address below with a note of your name and callsign:

Mark Taylor G0LGJ
c/o NARC
6 Welden Road
Scarning
Dereham
Norfolk
NR19 2UB

OR

Paypal
Use our online shop to pay via Paypal, you will need to login to website to complete.
http://norfolkamateurradio.org/index.php/on-line/shop/category-listing/product/687-online-membership
An additional charge incurred to cover Paypal costs.Paypal charge 2.9% + .30p per transaction. Totals £5.46

If you wish to pay direct using Paypal please pay £5.46 to This email address is being protected from spambots. You need JavaScript enabled to view it. - please be sure to use your callsign as a reference.

If you pay via bank transfer please inform the Membership Secretary via email and give the reference you used in your online transaction as banks do not always pass on references.
This email address is being protected from spambots. You need JavaScript enabled to view it.

Conditions that qualify a member for concessionary membership can be found in the constitution or shown on the form

Download and print Membership Form 2022

NARC Live! from Wednesdays - Now available on catchup

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Published: 01 April 2020

Last Updated: 01 June 2020

Wednesdays NARC Live! Club meetings are streamed live to both Facebook video and simultaneously to the BATC Live streamer. 

If you miss one you can watch it again on our Facebook page at  www.facebook.com/norfolkamateurradioclub 

We will be doing NARC Live! every Wednesday night at 7.30pm BUT we really need input and content from you! If you have a story to tell, a picture to share, a talk to give or are willing to let us into your shack (its really easy using almost any modern mobile phone or computer with a webcam) then please drop me a note -  This email address is being protected from spambots. You need JavaScript enabled to view it.

Stay safe

73, David G7URP & Tammy M0TC

New ICNIRP EMF assessment tool - online and desktop versions

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Published: 03 December 2021

Last Updated: 03 December 2021

The RSGB are pleased to launch their new version of the RSGB EMF calculator v11d which is now available in a new browser-based version as well as the spreadsheet version. You can find both versions on our website: www.rsgb.org/emf

The web browser version does not require you to have Excel or another spreadsheet on your computer. This update includes some minor additions and corrections to the data used for Pre-Assessed Equipment Configurations (PAECs) and there are lots of new features in the browser app version.

The app runs within your web browser, so no data leaves your machine unless you create a backup and share the file.

The web app also has these great new features:

1. It works better on phones, tablets and computers with the layout adapting to available screen space and supressing information not needed for the configuration set up
2. It has features to save and load configurations so you can keep them all inside the app
3. It comes preloaded with some typical configurations to get you started
4. The tooltips are a consistent size and very clear
5. Selecting the interactive info button makes them easier to use on tablets and phones
6. The figures defining the exclusion zones adapt and scale with their values making their meaning much clearer
7. You can quickly see the effect of changing parameters like power and antenna height on your compliance
8. The available antennas change with the band selected
9. For record keeping just click the ‘Save PDF’ button then copy the pdf, perhaps to a dedicated folder or memory stick. The PDF is effectively the record that you have conducted compliance checks

Many thanks to Oli, MM0YOS for his great work in writing the web app. We must also remember the continuing work of Ian GM3SEK, Peter G4DSE, John M0JAV and our friends in ARRL on the EMF team who derive the guidance.

Please give it a try and feedback any issues or antenna you have modelled which are not already on the system to This email address is being protected from spambots. You need JavaScript enabled to view it.