M0UKD


MØUKD

Pictures of the setup

Articles - Blog
SSTV Images
Contact Me

HomeBrew
Magnetic Loop
Slim Jim Antenna
Carolina Windom
144MHz Power Amp
20m Loft Dipole
Rig Interface
Longwire 9:1 'UnUn'
50 ohm 1:1 Balun

Not radio related projects
12v > 240v Inverter
Alkaline Battery Charger

Calculators
ERP & EIRP
LC Resonance
Low Pass Filters
Pi & T Attenuators
Slim Jim Antenna
Inverted Vee Antenna
555 Timer IC Calculator
Parallel Resistor Calculator
Volt Amp Resistance Wattage

Log
Calls in my log
SOTA chaser log

eQSL
My eQSL Profile (MØUKD)
Browse some eQSL Cards

Enter your callsign to see if you have an eQSL waiting!


Other stuff
Lead-Acid Batteries
Solar Panels
J-Pole Calculator

Morse
Morse Code

Links
Havering & District ARC
QRZ.com
RigPix
Solar Cycle 24

 


Where am I? This is updated every 1 minute when my radio and computer are on. 
Frequency: 0 MHz Mode: Radio: IC-746Pro
Last online / updated: 28-Feb-2010 19:47:35 UK Time.

Welcome. I passed my Foundation exam and got the callsign M3UKD on 4th Jan 2007. After operating as a Foundation Licencee for six months, I then took the Intermediate exam and passed in June 2007, and got the call 2EØUKD. I then took the advanced exam on 10th December 2007, and got the results on the 21st. Fortunately, I passed, and got the callsign MØUKD on 21st December 2007. I run an Icom IC-7400 from home, on 2m, and HF. Antennas are a Diamond X-300 mounted about 11 metres above ground for VHF/UHF, and a homemade carolina windom outside on HF. I also run 2 metres mobile with a Yaesu FT-2200, and portable with a Yaesu VX-7R, IC-706MKIIG or an FT-817ND. Thanks for visiting! John.

Recently added: 12v > 240v Inverter project.

Visitor Map

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Wednesday, 10 March 2010 04:39
Thanks for visiting, please leave a comment. 73!
Total Records: 112   Records Viewed Per Page: 25 [1] 2 3
Search    for  
Name & Callsign Comments
112) Tri Handoko  Female
Location:
Jakarta, Indonesia
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 YFF35 Firefox/3.6 (.NET CLR 3.5.30729)
Tuesday, 9 March 2010 08:44 Write a comment

I am newbie, I try to make 1900mhz antenna for CDMA phonecell as in my homeplace the signal is very weak. Thank you for giving me chance to read your good website.
Best regards Tri
111) M6ATD 
Location:
Oxford
IP logged Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
Saturday, 6 March 2010 14:04 Write a comment

Hi, I have just had a look to your web because i was looking information about a balun 1:1 for a 20 meters dipole
Congratulations
Ernesto
110) Bill Blackburn Jr w4zlu  Male
Location:
Decatur, Al USA
IP logged Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6; FunWebProducts; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Saturday, 6 March 2010 02:18 Write a comment

Excellent and very educational site, enjoyed very much browsing it. smile
109) Edgar 11-meter operator.  Male
Location:
Mexico
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Monday, 1 March 2010 04:11 Write a comment

Excelent information,I`m building a balun for RX the 160 meter band.And your 9.1 is the most easy to understand of all I found in the WEB.
73s from Mexico
smile
108) Al. GM1SXX  Male
Location:
Paisley. Renfrewshire
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2) Gecko/20100115 Firefox/3.6 View Web Page 
Friday, 12 February 2010 15:49 Write a comment

Very nice website with interesting and practical stuff for the radio amateur.
Good work.

Wish mine was as tidy!

73 Al.
GM1SXX
107) Sai, VU2SGW  Male
Location:
Thane, Maharashtra, India
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 View Web Page 
Tuesday, 9 February 2010 01:42 Write a comment

Nice info on each and everything. Will be trying slim jim antenna from your web page.
106) João Costa, CT1FBF  Male
Location:
Almada, Portugal
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Thursday, 21 January 2010 01:11 Write a comment

Very important site with much useful information, first-class job. The calcularts is great, the best you can find in Internet to J-pole and Slim Jim antennas, direct to my favorits.
105) Daniel DL1OFC 
Location:
JO52HR Germany
IP logged Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0) View Web Page 
Tuesday, 19 January 2010 19:02 Write a comment

Hello, nice Homepage... 73 from Germany de Daniel DL1OFC

[www.dl1ofc.de]
104) GIORGOS MICHALAKAKIS 
Location:
LARISSA KM19EP
IP logged Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; MEGAUPLOAD 2.0; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Saturday, 16 January 2010 13:34 Write a comment

SLIM JIM smile
103) steve /AA0NO  Male
Location:
palm harbor Florida
IP logged Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.38 Safari/532.0
Tuesday, 12 January 2010 22:45 Write a comment

I really like your site & thanks for great reference info big grin
102) John M3UIP  Male
Location:
Grimsby. N.E.Lincolnshire
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 (.NET CLR 3.5.30729)
Wednesday, 6 January 2010 07:22 Write a comment

Really enjoyed ur site, when this white stuff disappears i shall be looking thro' the box to make the Caroliner Windom many thanks for all the info on ur site.. good dx and Best 73

Happy New Year 2010

John
101) David Turney M0DKN  Male
Location:
Smarden, Kent
IP logged Opera/9.51 (Windows NT 5.1; U; en-GB)
Monday, 4 January 2010 10:39 Write a comment

Great site - interesting, informative , enjoyable.
100) Germany Sylt 
Location:
Westerland
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 (.NET CLR 3.5.30729) View Web Page 
Tuesday, 29 December 2009 20:34 Write a comment

Ein Kompliment für diese tolle Seite.
Eigentlich bin ich durch Zufall darauf gestoßen und dachte mir,
einen netten Eintrag und viele Grüße zu hinterlassen.
_____ \\\!!!///____
______( ô ô )_____
___ooO-(_)-Ooo___
Vielleicht schauen sie mal auf meiner Homepage vorbei! smile
99) Eric..G4JZR  Male
Location:
Nr Chester
IP logged Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.3; .NET CLR 1.1.4322)
Wednesday, 23 December 2009 13:58 Write a comment

Hi made up the 9-1 balun (unun) all went well except for 40m - 80m. 7.100mhz 2.8-1
R 28ohms...3.700mhz 7-1 R 3....MFJ analyzer. Any thoughts as to what went wrong!!. Thanks for a great site, 73 Eric G4JZR.
98) Steve M0ZEH 
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
Wednesday, 16 December 2009 15:53 Write a comment

nice experiments youve done, found your site by chance looking for 1:1 balun.

73
Steve
97) Jaime Ortiz KB7ZJF  Male
Location:
San Manuel, Arizona
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
Wednesday, 16 December 2009 03:47 Write a comment

Your website is awesome my friend..Keep up the good work. 73's
96) FRANCIS  Male
Location:
phillipines
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2
Tuesday, 15 December 2009 14:27 Write a comment

CAN YOU HELP ME ON SLIM JIM?

THEY HEAR ME WELL BUT I COULDNT HEAR THEM IM USING IC2GAT AND THE OTHER IS SAME BUT WITH 4 INVERTED J'S


IC-32/WILLYWILLY FROM ICON 7 INC CEBU CITY PHIL.

73'S
95) tono  Male
Location:
indonesia
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2
Monday, 14 December 2009 13:22 Write a comment

slim-jim, it's okay.....................
94) joe ve3abg  Male
Location:
Lowbanks, ON.
IP logged Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.3; InfoPath.2; .NET CLR 1.0.3705)
Thursday, 10 December 2009 21:48 Write a comment

Nice webpage John, will be visiting often

wink
93) Derek G4WXN  Male
Location:
Suffolk
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 View Web Page 
Sunday, 6 December 2009 16:00 Write a comment

I have now used your slimjim calculator twice, once for 2 metres and once for 4 metres, very useful data.
perhaps one small point, I have found the feed point to be much higher up the matching section than your calculator suggests, in both cases about 60% more. In the case of 2m, the calculator suggests 10cm from the bottom of the antenna, mine ended up at 16cm, having said that the SWR was flat all across 2m. The 4m Slimjim was also significantly different, around 60%.
Please do not see this as criticism, just hopefully useful feedback.
92) Keith Dunn G1NDK  Male
Location:
Staplehurst, Kent
IP logged Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Friday, 13 November 2009 11:38 Write a comment

Look forward to chat ??
91) Karl KC9QLX  Male
Location:
Illinois
IP logged Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.27 Safari/532.0
Tuesday, 3 November 2009 04:07 Write a comment

Just used a slim-jim design similar to the one on your site (I didn't find this site until after I built it). I mostly use 146-147 MHz frequencies, and I got it tuned to very close to 1:1 (less then 1.1:1, which is as good as my meter can read) for those frequencies. The only major difference on my slim jim is the gap size (which makes the "B" section (1/2 wave) short by ~0.2 inches; the A (3/4) and C (1/4) sections are almost exactly the length you have on your site).

I'm not even close to an expert on wave theory (I got my tech 2 months ago and my general last month) - is the 1/2 wave section/gap size not as critical as the "j-pole" sections? Also, my feed point had to be significantly higher than calculated (about 6" from the bottom).
90) John 
Location:
jo33na
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 AutoPager/0.5.2.2 (http://www.teesoft.info/)
Friday, 30 October 2009 20:23 Write a comment

Hy, OM, I find the SlimJim calcuator via Google, and so your very nice homepage, whit interresting homebrew projeckts.

Also your VHF Lineair, nice !!! I will try
to build this Amp.
So, 73, and maybe we meet us on HF, 3.630 LSB.

Bye, Bye. big grin
89) Skip Coombe  Male
Location:
North Carolina, USA
IP logged Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.27 Safari/532.0
Monday, 26 October 2009 19:55 Write a comment

smile Nice site
88) John Marthens, NU6A 
Location:
Normandy Park, Washington
IP logged Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322; MS-RTC EA 2)
Tuesday, 20 October 2009 23:01 Write a comment

With your pictures and information I am going to building a duplicate (I think) of your Carolina Windom. Came lose to spending unnecessary funds for a commercial item. I have a couple of questions for you:

1. How do you keep the far end PVC (?) plastic mast pipe from bending, what with the stress of the antenna upon the end support?

2. I am not an expert on Carolina Windoms, but I presume that the ratio you have used for your 40 ft (13 mtr version) would remain the same. Please confirm.

And, #3, as someone else asked, would you provide more specific information on the balun(s) you used in your antenna system?

73, John/NU6A
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