Home brew PMR Beam

Hi Everyone 
I was asked to put up couple of pics for my Home brew antenna with a rotor . I use this for the Southern & South east PPMR Net held by Ray 26CT2290/ 26CI2290 .
Hope this help's any question please ask .

Cheers John 26CT451


Regards John 26CT4515

Love the way it's leaning over at slight angle , but, that does seem to make all the difference listening to the radio/signal reports and distance you get even when on the 5 watt handy.

What did you make it with, cut down coat hangers from the charity shop?

73

Ray 2290

Nice work, John.

73s John.

Hi John

Antenna looks great.

Is it possible you could provide some dimensions? Length of rods and also the rod spacing?

73
Derek

An excellent bit of homebrew there John and thanks for posting.  

The second image looks like some sort of motor controller? (Bet that PP3 doesn't last long.  ) Be great to see some details of your rotor assembly. 

Always good to see a Yagi-Uda antenna without all the calculated 'performance' graphs!


Well done.

All the best,
Victor

Nice work John, well done!!

73's Gary.

Hi. Guys 
Sorry its been awhile I been a little busy. I will put up some more pics and details over the weekend as how I put it together. I did use a yogi calculator  but I will let you know how ,where and when  . 
Cheers for now .
Regards John

Hello Everyone.

As promised I have some more info on the PMR Beam.I will try and keep it short. 

List of Parts and Pics.

1. Motor controller.
2. Motor and flange plate. 
3. length of 21.5mm over flow & 25mm round conduit  with a couple of pipe joiners and tee shape joiners for 25mm pipe , plus 4mm steel rod  from B&Q.
4. large choc block for driving element.
5. Coax and plug & any 2 core wire to connect to motor , i  used speaker wire.

Amazon links .

1. Motor Controller. https://www.amazon.co.uk/gp/product/B09HT2MDJW/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1 
2. Motor.                https://www.amazon.co.uk/gp/product/B0741TC9JB/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
3. Motor flange.      https://www.amazon.co.uk/gp/product/B07PFWCTL2/ref=ppx_yo_dt_b_asin_title_o04_s01?ie=UTF8&psc=1

I used a Yagi Uda calculator  for sizes of elements and spacing etc.which is ,

https://www.changpuak.ch/electronics/yagi_uda_antenna_DL6WU.php just enter frequency etc and bingo all sizes etc ready for you.

The top view with inners of the choc block holding the driving elements.




The under side with the 21.5mm smaller pipe inside the 25mm so it can twist freely with a couple of pipe joiners and tee in middle so it can sit on the motor spindle.



Motor with the smaller 21.5mm section of pipe fixed to the flange, I used a bit of timber rounded to fit in the 21.5mm glued and screwed.



This all parts lined up and slide into each other. It just works great with the pipe joiners etc they all just fit right. I did put some grease on the section on flange for smooth opperation.


Well i hope this helps out any one and if you need more info or help just ask. I could always build you one if needed.

Hope to catch you on air sometime soon. 

Regards John 26CT4515

Thanks John for the excellent presentation of the construction of the very low cost beam and rotor. Very inspirational.

Good man

Nice antenna. Good to see your efforts, thanks for sharing!