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From the archive: Obligatory evening shot of a three element 40m array

DX Commander 40m 3 element vertical array £299

Perhaps you've seen the YouTube video - or had a copy with me whilst I was using just this system? Hours of planning, modelling and experimentation both in software with MMANA and also real-world testing has finally produced an excellent and extremely economical method of producing excellent DX gain in one ...

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Antenna Tow Ball Mount

IMPORTANT NOTE: This is an experimental tow-ball mount. Under test, I achieved some extreme loading however I can take no responsibility for anything going wrong. Playing with portable antennas inevitable leads to the odd "accident". So please do your own risk-assessment by calculating what would happen in any failure and that you have considered the ...

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DX Commander Bare Bones Complete 10m Multi-Band HF Vertical

All products that include the Classic Pole starts shipping 3rd Week June 2020 SEE LATEST DX Commander ABV Release Notes 2017 I listened! Some of you wanted an economical bare-bones system without all the little "bits". Here it is! Note: UHMWPE is suitable for world-wide QRO operation. Of course QRP will work just the same. This is ...

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DX Commander all-band conversion kit

This is the QRO conversion kit uses new UHMWPE plastic parts and 3mm pure Aluminium 1050 for improved efficiency. It's taken me a few years to get the dimensions "just right" and is the expensive part of the project. All new plastic UHMWPE plates have new hole pattern for either 3, 4 or ...

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DX Commander CLASSIC - HF Multi-Band Vertical System

This listing is for the Classic version of the DX Commander vertical antenna. This comes as a KIT. See user guide here: https://www.m0mcx.co.uk/wp-content/uploads/10mABV-User-guide.pdf Ideally suited to Christmas Presents, Birthday Presents and for those people who need a "plug-and-play" approach to their operating with a small amount of prep and QRO if required. NEW! Now with ...

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M0MCX Banana Antenna - an end-fed choke sleeve resonant feedline T2LT antenna design

A new document fully documenting the design of the Banana Antenna has now been released entitled, "Banana, a Half Wave End-Fed Choked Coax Antenna". Antenna can be known as - and is similar to: Sleeve Dipole / Flowerpot Antenna The Sleeve dipole has traditionally been used by VHF antenna designers by sliding an ...

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JT65 UK Band Plan and how to stay within

The 5 MHz band is pretty cool and I've written about it before however out the box, JT65 allows you to very easily transmit out of band on 60m band. The segment we're interested in the UK is the freq block between 5.354 and 5.358. This has taken me a little ...

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Introduction to the 60m Band Plan (5 MHz)

60m is an interesting band. it's partly channelised into small segments and the propagation is a cross-breed of 40m and 80m.The band was first introduced apparently in 2002. Over the years, various countries have allowed their amateurs radio operators to use the band. All this is negotiated and approved in conjunction ...

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From the archive: Obligatory evening shot of a three element 40m array

10m Telescopic Flag Pole Antenna Support DX Commander

The original DX Commander Classic Telescopic Pole. These are the best selling heavy duty telescopic antenna support on the market. With over 1,000 sold and 100% track record, I know what I’m doing – and I use these myself in real-world RF applications. Club members, personal friends and other regular amateurs love ...

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Working 15m band on a 40m vertical antenna

Note: This article discusses the merits of a 3/4 (three quarter wave) vertical -vs- a 1/4 (quarter wave) antenna. You can build a 40m vertical quarter wave antenna and ground mount it with 16 x 4m radials and operate it at the third harmonic; 21MHz. Actually, all my experimentation has shown that ...

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Converting a 40m vertical to run on 80m / 75m band

Recently, I created a slightly loaded 40m vertical with 25 ground radials. It seems to work very well although the receive noise is pretty lousy compared to my loops and dipoles, however on transmit, it does seem to work as planned; a typical 1/4 wave pattern that outperforms regular dipoles at low angles of ...

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Raising Steel Antenna Mast on T&K brackets with pulley

I'm gradually swapping out any aluminium antenna poles for steel. Clearly these are very heavy, particularly with an antenna on top. The trick is to use V bolts (like U clamps but in a V shape) and not to use saddle clamps because the pole will not slide easily past the ...

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How to make a stealth amateur radio wire antenna

How to make a stealth amateur radio wire antenna

Until recently, I had a) a 40m triangular loop in the back garden which I called a "micro-mega-loop" and b) a 60m loaded loop that allowed me to get on 80m. The two loops looked a bit horrendous not only because of the wire in the air, but because I ...

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Special Event Operating Procedures

This note will be particularly beneficial to those who may be required to run a special event station either on the lower bands or maybe on VHF. These tips & tricks will also help you anywhere on the band, regardless of your circumstances. Preface: There are a number of aspects that ...

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Coax Loss Comparison

I can never find the comparison charts between RG213 and Henry Westlake's Westflex W-103. At last, I'll have this logged forever now. Per 100 meters: RG213/URM67(Mil spec) Westflex 103  100 MHz                      7 dB 5.0 dB  144 MHz                    8.5 dB ?? dB  200 MHz                     10 dB 7.5 dB  300 MHz                     13 dB ?? dB  400 MHz                     15 dB 11.0 dB  1000 MHz                   27 dB 18.0 dB  

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Antenna DesignsFree Download & Film

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Amateur Radio Antenna Blog
3d-printed-spike-featured

3d-printed-spikeJames, G1JSP, who goes under the handle of Jimbo888 on YouTube, sent me this amazing “spike” that fits onto the bottom of the DX Commander which is held in place with the screw cap.

Feel free to download the file and print the component off :)

The file is located on my Google Drive here:

https://drive.google.com/drive/folders/1CXmBpQMF4qzl5b_O0PK48fdcZKu-VlKc?usp=sharing

NOTE: Using my OWN call as a test since there should be no QSL requests..

I am inviting folks who are a little more isolated than others to pop in at 11:00am each morning.

All you need to do is get your callsign in my log and I’ll call you in for a 30-second over in time.

If the net is too big, I can invite a secondary net to drop down 3kHz etc.

All you need is the target frequency and velocity factor for this one. However, if using economy coax, your quoted VC may be off, so if that’s the case, you may want to measure a 90 degree test piece (that’s also shown in the calculations).

To check for accuracy, you can cut a 90 degree section of coax and short out the end. Attach to your analyser and you should get zero SWR at the target frequency. Just a tip.

Here Is the Excel Spreadsheet: phasing harness calcs

MMANA 2 Element Delta Loop modelling: I mentioned this on Saturday’s LiveStream. You can download it and have a play, rotate it, delete the reflector etc:

DOWNLOAD HERE >> 40m 2-ele delta loop <<

Remember, DON’T email me, but comment on the channel. Thanks!

I have custom boxes made that keep my shipping cost effective, staying under 1.2m in total length.

Kits are shipped in the oblong boxes and single poles in corrugated cardboard.

120cm box

Trying to find the DX Commander Lite 7m multi-band vertical on YouTube? It’s here:

Click Here for YouTube

dxcommanderliteplaylistgraphic

Need a quick logger in spreadsheet format?

Confused? See the film here:

I notice that CamDesk is offline. This is my download which I originally deleted – but since I have discovered that CamDesk is offline, I managed to find it in my recycle bin for others to use.

This is a ZIP file. Obviously take necessary precautions when unzipping etc. I’ve had this installed for about 2-months.

NOTE: It’s a self executing program file. It doesn’t need DLLs and doesn’t “install” itself in Windows. It just runs from the install directory and you can move it around, say on a USB stick if you like.

When is an Ugly Balun just dead weight? Check out my facts and figures for Choke Baluns.

How to make high quality local contacts within a 500 mile radius.

Fan dipoles are the easiest multi-band antenna you may wish to have a go at.

You can buy an expensive switch box to accomplish phased array system. But to test out the theory if you’d like to go down this route, you could try a simple vertical yagi?

Check out my film and decide for yourself.

Make your decision wisely.

Tips for new Ham Radio (Amateur Radio) operators.

We have all made mistakes when we buy the wrong radio.

I give you some tips to work out how to achieve perfection. Well, certainly a balance!

I thoroughly recommend adding a dimension to your club station or special event station by live-streaming your event.

It’s not as hard as you think – and the tools are free.

Check it out.

I have since learned that some radios are more susceptible to causing this problem than others, however in my opinion, keeping your ALC to tick-over and no more will be the best policy.

Check the film.

We’re always told to check our house before accusing neighbours of local noise.

Oh heck, I wished I had listened nine-months ago!

Check my results.

So I had a requirement to connect my RE20 / PR40 / Shure SM58 / SM57 professional microphone to my Ham Radio (Kenwood TS2000 / TS590 / TS990s) and I show you an easy trick.

The pin outs are all over the internet, so I won’t bore you with them here.

But check the video.

There are benefits to both. Height above ground will kill a vertical. But do you have the height?

What a fabulous microphone.

Check back for review and shoot-out of RE20 and PR40 soon.

Many people have got one of these. But what are they really like?

I show you.

Some people aren’t quite sure how easy it is to build a mono-band quarter wave. They are cheap and extremely easy to build.

Check out the video.

Surprise surprise. I was astonished that a cobweb isn’t as bad as I thought it was, certainly in software modelling.

Check it out.

A G5RV is really a doublet, using the feedline to transform (automagically) some pretty nasty impedances to a suitable impedance for coax.

I explain this here:

I’ve discussed this before. 40m band quarter-wave does resonate on 15m.

But is it worth it?

You bet.

An inverted L is just like a vertical apart from the fact that instead of going straight up (like a tuned quarter-wave), it turns 90 degrees somewhere.

I discuss this in this video:

I cover this in my youtube video. CHeck it out.

Here’s the spreadsheet:

EXCEL: <quarter wave vertical calculator> link

In this video, I show you why you shouldn’t worry about height for your wire dipoles and loops.

Unless you can achieve leaps of a quarter-wave in size, just go with the flow (or put up a DX Commander All-Band-Vertical! :)

All contests have some sort of report, mostly the signal report then additional pieces of information, from your age to your shoe size (seriously).

Here’s me on 15m during IOTA 2017:

(100 Watts, recorded straight out the TS590SG into Audacity)

Antenna: DX Commander Vertical 80m-10m

(read more…)

q-wave-vs-5-8th-wave

Compare Red 5/8th -vs- Blue W/wave

Anyone who has mucked about with verticals will no doubt have worked out that a full-sized quarter-wave for the 40m band, more or less tunes up for 15m band.

It wasn’t until my entry in IOTA Contest this year that I convinced myself that they are not a cloudburner (as many people suggest) but compare favorably with a quarter-wave, even producing more gain by 2 dB at 10 degrees above the horizon.

OK, so 2 dB isn’t a huge gain, but hey – it’s free. Take it when you can!

Don’t forget, you can do the same for 10m band too by making an element 6.83m long and folding it back a further 1.11m (for 28.5 MHz). So you’ll need nearly 8m of wire. Don’t forget, that’s insulated wire!