QRP Club
QRP Station => Builder's Corner => Topic started by: G6URM on February 13, 2017, 12:02:13 UTC
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(http://www.reduceimages.com/download.php?image=284bc01029) here a simple atu for 2 meters - 100 pf Vc - coils 5 turns on a 45 mm former ( drill bit ) nothing complex - ok up to about 25 w depending on plate spacing - will work with long wires too - note the TOP of box mounted o/p so239 or n- type socket ( to which you could screw a 1/4 wave or whatever for a simple expediant antenna ) - the brass bolt is the earth point and you should use a counterpoise rod or wire at least 1/4 wl long here if using it as a stand alone antenna base
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Hi!
Could you attach a diagram, also hand made, to be more sure? Do you have some pics also?
Thanks.
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Hi OM Brett,
Please try uploading the images again. However I am able to visualise it since I have seen commercial 2m and 70cm ATUs. I am sure the former diameter is 4.5mm (decimal point missing!).
Having the output connector on top along with a point to connect a radial is a good idea.
Have fun!
73,
Nandu.