[DARARepeater] TNG - Thursday, May 8 - Pre Hamvention cleanup

[Mark Erbaugh]

TNG – Thursday, May 8, 2025

DARA Clubhouse, 6619 Bellefontaine Rd. Dayton, OH 45424.  The meeting begins around 7pm. 

This week we will clean up the meeting room to make it presentable during Hamvention open house.

There will be no TNG next Thursday as the clubhouse will be open for Hamvention visitors.

If anyone wants to or knows someone who might want to give a presentation at a future TNG or if you have a topic that you would like to see, please let me know.

Everyone is invited!!!

73,
de Mark, N8ME

License Exam Quiz #318

de Steve, AE8AT 



May 6, 1937 in Lakehurst, New Jersey, LZ-129, the Hindenburg, crashed taking 13 of 36 passengers, 22 of 61 crew, and 1 person on the ground crew (total of 36 deaths, 62 survivors). Herbert Morrison was the reporter for WLS Radio (Chicago) who recorded the “oh the humanity” line. Our focus is not the crash but the cutting edge (for the time) radio communication equipment the Hindenberg carried. It was capable of both Morse Code and AM voice communication, and it also carried direction finding equipment using radio navigation to cross the Atlantic. Exact frequencies reported by VE3IPS were 5280, 10290, 10335, 10500, 11040, and 12550 Khz. Telefunken was the manufacturer, and the S406 and S408 might have been the models aboard. Morse Code was a spark gap transmitter; various sources indicate the transmit power was 100 to 400 watts with 200 watts being a consensus. The voice transmission used thermionic valves (vacuum tubes) with perhaps 50 to 150 watts. Diesel generators and lead acid batteries supplied power, with estimated battery capacity of 7.2 kWh to give a couple hours of power in the event of generator failure. None of the sources was a manual from Telefunken or similar quality, so take it all with some skepticism.



T4A09 How can you determine the length of time that equipment can be powered from a battery?

A. Divide the watt-hour rating of the battery by the peak power consumption of the equipment

B. Divide the battery ampere-hour rating by the average current draw of the equipment

C. Multiply the watts per hour consumed by the equipment by the battery power rating

D. Multiply the square of the current rating of the battery by the input resistance of the equipment



G6A01 What is the minimum allowable discharge voltage for maximum life of a standard 12-volt lead-acid battery?

A. 6 volts

B. 8.5 volts

C. 10.5 volts

D. 12 volts



E9C10 Which of the following describes a Zepp antenna?

A. A horizontal array capable of quickly changing the direction of maximum radiation by changing phasing lines

B. An end-fed half-wavelength dipole

C. An omni-directional antenna commonly used for satellite communications

D. A vertical array capable of quickly changing the direction of maximum radiation by changing phasing lines





Answers:

T4A09 = B

G6A01 = C

E9C10 = B


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