of Electrical Engineering
E. F. Cross School of Engineering
204 South College Avenue
College Place, WA 99324
email: My first name "dot" my last name "at sign" wallawalla.edu
Phone: (509) 527-2075
Fax: (509) 527-2867
My favorite magazine which has a lot of good
stories is Guideposts Magazine
If you are interested in how I became a Christian, look here .
The Land of Bearded Trees,
a book by my Aunt Joan Frohne Abbott and my grandmother, Margaret
Doorly Frohne, a beutiful book, with interestig stories of life on
Barbados in the 19th century.
Dynamic Carrier Control: AM Transmitters Save
the Power Bill While Sounding Louder
Do you operate an AM transmitter, especially an
AM shortwave transmitter? If you do, you should be using dynamic
carrier control (DCC). Dynamic carrier control lowers the carrier power
when it is unnecessary in such a way that to receivers equipped with
automatic gain control (AGC) the signal sounds even louder than when
more power was being transmitted. I designed a DCC circuit for the
Thompson transmitters at Adventist
World Radio Asia , on Guam.
It saves them about 20 percent on their power bill (several thousand
a month savings). I also designed a similar circuit for High Adventure Ministries
stations in California and Palau. If you have a need for this circuit,
me an e mail message. I believe in conserving the world's resources and
I'll probably be glad to help you. I had a little documentation on this
circuit on disk that you can look at if you like. Check here for that.
My handwritten notes from 1991 describing the DCC circuit I used for
the Thompson transmitters at AWR is described here
as a PDF. Those transmitters are now in use in Palau.
Some of my Favorite Classes to Teach:
- Engineering Electronics
- Electromagnetic Propagation & Radiation
- Communications Systems
- Signals & Systems
- Analog Design
Class Notes and Links
Frohne Family Notes of Interest
- Amateur Radio
- My call is KL7NA/W7. I spend most of my
hobby time playing with radio projects. See Some Recent Papers . You can see me installing my four
element five band quad at 90 feet. It used to be at 120 feet, but I
moved nearer to the local airport.
- I have used Ham Series rotors for years,
and learned some hard lessons with them. Read about how to avoid
- I have some radio schematics available to
download here. I scanned them for friends who requested it on the news
groups. The ones available are:
- I wrote a program for the Commodore
Amiga years ago, and recently found it on the net! It is a toy for
learning Morse code. It is called CWToy. You can find it at:
- There is also some software that goes
along with the DSP Demodulator for the R2 receiver mentioned in the recent papers section .
- I have used an Apple Powerbook 520c for a
few years, and in that time I've had some things to fix. If you
have a 520 or 540 you might want to look at Powerbook 520 & 540
and Fixes I've come up with.
- I acquired a Wallstreet Series I
powerbook, and came up with a fix for
to press clicker .
- I ended up with a 3400c powerbook, and
found that it seems to be cardbus
compliant even though Apple doesn't admit it.
- I have been having a good time with
REALbasic from Real Software. It is an object oriented basic for the
Macintosh platform. I have a class that will do Cartesian plots. You
can download it
- I have been playing around with Apple's
AirPort wireless networking. Here
I have an article on adding an external antenna to the AirPort base
station. Here I have a
document on how to install Airport 1.2 on Mac OS 8.6 even though Apple
says it is not possible. Apple also claims that it will
not work on a powerbook 3400c and it works fine for me. I have a page on using the surplus
Primestar dishes with an IEEE 802.11 wireless network connection. Here is an index of my IEEE 802.11
Save My Whiteboard is a program I
wrote to transform photos of the whiteboard
into printable notes that are also nice for posting to the web. I use
this to preserve whiteboard notes for my students from my lectures.
is an open source program I wrote to learn Cocoa for Mac OS X. It is a
simple RPN calculator, and I use it as my computer calculator of
- Collecting Hewlett Packard Calculators.