Elecraft K2 Internal 4:1 balun

March 8th, 2009 by m0rgb

Whilst looking around at the various mods done to K2's I discovered the following balun.

It is a small efficient QRP balun designed some time ago by Charles Greene W1CG. see www.njqrp.org for further details, including full building instructions.

My K2 is setup on internal batteries with it's main goal to be a portable radio. As I use mainly doublets through a 4:1 balun I thought building this inside the K2 would suit my needs perfectly.

I purchased the toriods from www.qrpproject.de you can buy these ready made but I wanted to build it! The toriods purchase were Amidon FT82-43.

Main components used

Main components used

As I had already performed a mod to add a separate charging socket to my K2 I knew I would have to move this to allow me to add the balun.

The balun consists of two toriods wound with 6 turns on way, a cross over and 6 turns the other way. Then wired together to give 4:1

Winding was pretty easy compared to the many toroids in the K2 :-)

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Elecraft K3

January 10th, 2009 by g0vgs

Building the Elecraft K3 is a joy.  The engineering design that has gone into the radio is amazing.  The tolerances of the case fittings are fantastic.  I have actually built three of these so far (only one for me unfortunately) and they were all straightforward to do.

I have had mine for just about a year and it has not disappointed me yet!  I don't expect it to either.

What follows is a quick look at how to build a K3 from opening the box to operating.  I hope you find it useful.

The Elecraft K3

The Elecraft K3

When the K3 arrives it comes in one large box.  The first thought on opening the box is how many other boxes are inside it!  They are extremely well packed too.

A box of Boxes :)

The first thing you should do is find the manual and the errata and annotate your manual.  Once that is done, inventorying the parts is useful.  A thought at this point.  It is very easy to end up with stuff everywhere.  There are so many packets and boxes that it is easy to lose things, so try and work in a logical manner.

The other thing to do is to ensure you have an antistatic mat and wristband.  There are many static sensitive components on the K3 boards and the last thing you want to do is to create a problem that might not show up immediately but arrive later when you have no idea what caused it :)   If you are spending this amount of money on a radio, it is worth an extra few pounds to buy an anti-static mat and accessories.  Every workbench should have an anti-static area in this day and age.

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