Ian GM3SEK Filter kit - Where to buy and NARC Member feedback...
- Details
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.
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:
Wound my cable as tight as I could and just that bit more heated and left for 30mins before releasing stayed good and tight.
Once done it made a remarkable difference S1 down at least so can mark as a 1 from me.
Much cleaner signals coming in especially on top band. Pictures show in working position running just radio power supply and its computer system
Amazing what difference it made! Used other ferrites to wrap onto power lead for computer and coax cables
One problem I had was that I have a outside motion light switch which when I did transmit on 80mts it switch on the outside lights
Which to me was no problem but because our front door has a small window in and the light shone through
My wife got fed up with keep going to the door to see who was there?? Or wasn’t?, But all seems ok now?!
Current 2022 Membership List
- Details
2E0BDB Tony
2E0BNI George
2E0DBS David
2E0DJR Julian
2E0FRD David
2E0IBP Nicholas
2E0NLK Nigel
2E0NXL Paul
2E0OBO Bob
2E0ODT+ Belinda
2E0PFG Pat
2E0PKH Paul
2E0POI+ Lorna
2E0SZP Michael
2E0TTN Marshall
2E0TWQ John
2E0VFN Ben
2E0XLL Simon
2E0YAO+ Lorna
2E0YWP Douglas
2E1GTE+ Sarah
2M0RHT Ralph
A Lord Adrian
G0AKO Roy
G0BIX Terry
G0CBO Rodney
G0DFC Leslie
G0DWV Chris
G0ELJ Dave
G0FEI Victor
G0FVG Peter
G0GGF Chris
G0HQJ Gordon
G0HUZ Tony
G0HZP Mervyn
G0IMU David
G0JAG Richard
G0JSG Philip
G0JSV Tom
G0KAD Michael
G0KRU Alan
G0KYA Steve
G0LGJ Mark
G0LUZ Suzanne
G0MQG Tony
G0MQI Robert
G0MXN John
G0ODR Colin
G0OOD Tim
G0OOR+ Tony
G0PEQ Peter
G0SGT Daivd
G0TMT Mark
G0TZZ Chris
G0VMK Peter
G0ZAA+ Shirli
G1EGL Robert
G1FPK Ron
G1KTN Richard
G1MSE David
G1SCT Michael
G3EVA Steve
G3JNB Victor
G3LDI Roger
G3MPN David
G3PDH Malcolm
G3SEM Paul
G3SGC Graham
G3UDA Ken
G3VPT Paul
G3VWQ Peter
G3WRJ Dick
G3XLG Ray
G3XLL John
G3XVL Chris
G3YLA Jim
G3YOA Alec
G3YPP Mike
G3YSX Stewart
G3ZIG Roy
G3ZQU Martin
G4AFF Stewart
G4BDW Jim
G4BEW Stan
G4CCX Chris
G4DYC Mike
G4EYT Colin
G4GHO Steve
G4GXL Steve
G4HUN Neil
G4IJC Jim
G4JQT Ian
G4JUV Neil
G4KQY Mike
G4KZT Bruce
G4LPP+ Philip
G4NEY Jonathan
G4NRL Keith
G4OZG Ted
G4PFZ John
G4RAV Pete
G4RB Robin
G4RZN Richard
G4THN
G4TNY Daivd
G4TUK Robert
G4VLS Paul
G4WTD Colin
G4WUG Kim
G4XBT Paul
G4ZBA Paul
G6AIO Phillip
G6DDX Mark
G6PWS Bob
G6WQN Wilson
G6YXB David
G6ZRF Peter
G7ETC Simon
G7JTZ Robert
G7KBF Stuart
G7PLF Jeff
G7PQF James
G7SNC Ivan
G7UGB Martin
G7URP+ David
G8AUN Reg
G8CHP John
G8EEY Mike
G8IFF Nigel
G8IXM Roy
G8JWT Roger
G8OO Alan
G8SDU Robert
G8VPE John
G8XQD Tom
M0BLH Scott
M0BQC David
M0CNM Andy
M0DZB Keith
M0EVK Ray
M0GMK Colin
M0HBL Peter
M0HET Stephen
M0HGR Kenneth
M0HGU Nick
M0IWB Ian
M0JKB Stuart
M0JMS James
M0JYE Steve
M0KJW+ Ken
M0KKM Kevin
M0KRK Donard
M0LDK Simon
M0LJD Laura
M0MEA Mark
M0MTW John
M0MUI+ Mui
M0NFY+ Neville
M0NKR+ Andrew
M0NVT Nick
M0OCL+ Leanne
M0OEB Charles
M0OLY Oly
M0PEZ David
M0RYB Peter
M0SIH Simon
M0SWO Anthony
M0SYW Sonny
M0SZ Susan
M0TC+ Tammy
M0TDK Tony
M0TEO + Thomas
M0TNE Terry
M0TUM Richard
M0UJD Kevin
M0UKR Alex
M0UKS+ James
M0UMG+ Mark
M0VCX John
M0VRA Peter
M0WBR Robert
M0WEL David
M0WLR Phillip
M0XKM Martijn
M0XTF Tony
M0XXM+ Mike
M0XXR+ Becky
M0YCT Mark
M0YRU Stephen
M0ZAE Henry
M0ZAH James
M1ADX Jonathan
M1AFQ Paul
M1BKF William
M1MIT Timothy
M1TES James
M3ILY Mike
M5MSX Martin
M6DBA Dominic
M6DPZ David
M6KYF Stephen
M6UES Richard
M6VWN
M6ZLA Zena
M7AQG Ken
M7BAZ Barry
M7BLX David
M7CNI Steve
M7EAH Claire
M7EBX Sam
M7EPK Nigel
M7JPC Jan
M7KKO Keith
M7LLS Mark
M7LPP Alison
M7MCO Michael
M7PWL Rodney
M7RDE Richard
M7SEY Brian
M7SUI Max
M7YRU Marie
M9AWW Alan
M9BSK Paul
M9FVG Richard
MI0TMW Mervyn
MM0UMH Les
SWL3+ Lyn
Table 1 Morse Classes
- Details
The schedule for NARC Morse tuition locally is as follows:
.
Tuesdays:
1000 - 1100 Coffee Break Morse with Chris G4CCX on 145.250MHz
1900 - 2000 Raw Beginners as first choice with Roger G3LDI on 145.250MHz
Stephen M6KYF is the only student in this class. If you wish to learn CW, call in.
2000 - 2100 Intermediates with Jim G3YLA on 145.625MHz - in other words on GB3NB repeater,
.
Thursdays:
1000 - 1100 Coffee Break Morse with Chris G4CCX on GB3NB
2000 - 2100 Advanced Class with Malcolm G3PDH on the GB3NB Repeater.
.
The Tuesday class is well attended, as is the Thursday class on GB3NB.
.
INFORMAL evenings at the Club will still have Morse in the Computer Room with Paul M1AFQ and Chris G4CCX.
.
******************************************
NARC Newsletter Content
- Details
There have been mumblings in the mortuary about the content in the NARC Newsletter.
It's the same every week!! We see the same people writing stuff every week. It's always about CW, Propagation, Contests etc.
Well, wouldn’t you know it, these are subjects that are the very essence of our hobby!!
We never see any news on home construction, the Bright Sparks, the DX I have worked, the latest antenna I made, repeater news, fast scan TV news, technical topics, and so on.
Well, there is one answer to that! Why don't YOU write something? It's not difficult. I would love to read about YOUR pet subject, so get to your keyboard and start typing. Deadline is Thursday evening, late, and if you are not sure how to get it to the Newsletter, a simple set of instructions are available.
Newsletter > Email addresses
- Details
Hi some of you will not be getting the NARC Newsletter mostly people with email addresses containing live.com, live.co.uk, outlook.com, hotmail.co.uk, hotmail.com and aol.com
This is due to problems with our hosting company and the shared ip address we use to host our email server.
I am afraid I am unable to change this currently. I have asked the host to look into this and remove the problem ip address from the blacklist.
You can always read the newsletter online or change the email address you have the newsletter delivered to.
Regards Mark G0LGJ
Page 4 of 5