I built my own. You can see a 'brassboard' of it on my web page
http://www.qsl.net/k7fj/
The tuner now uses a BasicX PIC which has far more memory available than the
Basic Stamp PIC. The tuner works great at 500 watts when driving my 600
foot horizontal loop through ladderline.
I plan to order a K2 case next week and will be building the tuner into the
new case this winter.
There have been changes in software. I no longer use it as an autotuner
because I ran out of memory for that function but it could still be
implemented with a little programming effort. I found that autotuning is
just not necessary. The tuner is designed for manual tuning using
inductance and capacitance up and down buttons and, once a good match is
achieved manually, L and C are stored in memory for that particular
frequency. This can be done for either of two antennas (selectable from a
menu). The C is connected either to the output (antenna) or input sides of
the inductors by a menu sellection and this is remembered (and retrieved
automatically) for each frequency and each antenna.
The tuner is connected to the com port of the K2 and its settings (L, C, and
input/output C connection) are automatically changed whenever the frequency
of the K2 is changed. It is a completely 'hands off' tuner.
Don K7FJ
I am still wishing for a truly balanced auto tuner with one set of
capacitors and two sets of inductors.
72,
John W2XS
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
