top_banner (12K)
SITE CONTENT
Home
Awards
Become A Member
Challenges
    Alphabet Tutorial
    General Rules
    Results
    Oct 2019
Contests/Sprints
CW Assistance
CW Nets
FAQ's/Info
Guestbook
Member List
Newsletter
Pictures
QRP Works
>>> Contact Us <<<


Valid HTML 4.01 Transitional

Valid CSS
The NAQCC October 2019 Challenge

All challenge info such as rules are now in the hands of Gary K1YAN. Email him with any questions in that regard at pix_email_k1yan (1K).

The results on this page are the responsibility of Hap K7HAP. Email him with any questions in that regard at pix_email_k7hap (1K).


THE ALEXANDERSON ALTERNATOR

pix_alternator.jpg (20K)


PREMISE:
Spark gap transmitters were the first generation of radio transmitters. They produced a broad spectrum, decaying ( damped ) RF wave which led to a lot of interference between stations. It was discovered that if an electrical alternator, with a large number of magnetic poles on the armature, was run at a high enough speed, it would generate continuous, narrow bandwidth, RF frequency waves. Early alternator designs were limited to maximum output frequencies around 10 kHz, not making them particularly attractive for radio transmission. In 1904, Reginald Fessenden ( we met him in the December 2015 challenge ) contracted with General Electric for a 100 kHz alternator for radio use. Ernst Alexanderson created the design for GE and received a patent in 1911. The initial device, a design in the 200 to 500 kW range, was used for shore stations as it was too big for shipboard use. However, a later design, small enough for shipboard applications, was produced. It was a high maintenance device, as it constantly rotated at speeds around 2000 to 20,000 RPM, depending on the number of poles in the rotor and the desired frequency. Changing the speed of rotation directly varied the output frequency, so accurately changing the operating frequency was a challenge. The Alexanderson alternator was the second device to be modulated for AM transmission.

A number of units were installed in the 1920’s and operated in the 16 to 36 kHz range ( roughly 18,300 to 8,400 meter bands ). The US Navy operated four stations during WW II in HI, NJ, MA and CA. A number of units remained in service until the late1940’s. The last unit, located in Grimeton Sweden, a UNESCO World Heritage site, was shut down in 1996. It is still operated for a few minutes on Alexanderson Day, either the last Sunday in June or the first Sunday in July. A unit retired from Marion, MA is now in the Smithsonian museum.


TIME FRAME:
The first day of the month 0000Z through the last day of the month 2400Z


RULES:
Just make ALL these words from calls of stations you work subject to the General Challenge Rules. (Any spaces in the phrases should be ignored. For example the challenge phrase "INVERTED V ANTENNA" should be treated as if it is the single word "INVERTEDVANTENNA.")

ERNST ALEXANDERSON
ELECTRICAL ALTERNATOR
CONTINUOUS RF WAVE
18300 METER BAND
GRIMETON SWEDEN

The 81 total letters and numbers contain these 23 different letters and numbers : A B C D E F G I L M N O R S T U V W X 1 8 3 0

You can use each letter in a call TWICE. For example you could use K3WWP for 2 K's, 4 W's, and 2 P's.

Subsequent QSO's with the same station cannot be used for additional letters. For example, no matter how many times you work K3WWP, you can only use his call for 8 of the letters in the words.

See General Rule #5 for more details on what callsign letters can be used.

If you need some help with your alphabet challenge record keeping take a look at our Alphabet Tutorial page for everything from some great pencil & paper methods to fully computerized tools.


AWARDS:
A certificate and Participation Point go to everyone making all the words and submitting their report before the deadline.

A Participation Point goes to everyone making at least 1, but not all the words and submitting their report before the deadline.


PRIZES:
A choice of an item made by master woodworker Gregg WB8LZG as shown on our prizes page here goes to someone selected via a random drawing from all who participate and submit a report for this month's challenge. A person can only win once, then they become ineligible for future drawings.

Since this month we are celebrating the 15th anniversary month of the NAQCC, we are also going to have a random drawing that will award 3 great prizes to some lucky challenge participants. Simply be a member of the NAQCC, complete at least one of the words, and submit your report by the deadline and you will be automatically entered into the drawing.


LOGS:
For your report, list the words you made and the station used for each letter in the word. The number of stations listed must be the same as the number of letters in each word, even though you use the same station for more than one letter as in:

WORD - K3WWP N2OD WA8REI N2OD
NEXT - NF8M W8REI N8XMS K9EYT

(Note how N2OD is listed for both the O and D.)

You may also include comments about the challenge. Please preface any comments you want posted with "SOAPBOX:" so we will know what you want posted and what is private.

Send your results as text in the horizontal format shown above to:

E-mail: pix_email_k7hap (1K) (You must type that address into your email program.)
Subject must read: (your call) NAQCC (month) Challenge
For example: K3WWP NAQCC February Challenge

All entries must be RECEIVED before the 10th of the following month at 2400Z.


Results:

 
All the above get a certificate and participation point.

All below get only a participation point.

 
Not eligible for a certificate or participation point for the following reason(s):
@ = Non-member
$ = QRO power

Soapbox: