Perhaps you've seen the YouTube video - or had a copy with me whilst I was using just this system?
For three-in-a-row or triangular array users on 40m.
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DX Commander M0MCX VPA (Vertical Parasitic Array). Click for plot.
Listen to me on 40m into ...
In stock!
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 ...
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 ...
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 ...
This is for the Classic (original) version of the DX Commander vertical antenna (40m - 2m)
This comes as a KIT which includes the 10m DX Commander telescopic pole, the aluminium and UHMWPE plate set, all nuts, bolts, washers, fork connectors etc and 100m DX10 Wire on a factory packed roll.
Rated ...
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 ...
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 ...
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 ...
The original DX Commander Classic Telescopic Pole.
These are the best selling heavy duty telescopic antenna support on the market.
These poles come packaged brand new, 1.2m length with a protective plastic see-through snap-top temporary dispatch bag. They telescope to at least 9.6m in length (sometimes a bit more depending on factory ...
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 ...
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 ...
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 ...
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 ...
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 ...
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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James, 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
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.
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:
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.
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?
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.
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.
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.