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Author Topic: Spark Gap CW  (Read 8089 times)
WB0UQD
Member

Posts: 60




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« on: April 14, 2014, 09:20:17 AM »

Does the old "Spark Gap" CW need an antenna? Thanks!!!
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W1JKA
Member

Posts: 2099




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« Reply #1 on: April 14, 2014, 09:26:31 AM »

The SPARK did, but the GAP didn't. Wink
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AA4PB
Member

Posts: 15065




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« Reply #2 on: April 14, 2014, 09:38:36 AM »

Most required an antenna and a ground. The output wasn't 50 Ohms. If you connect and antenna your neighbors, other hams, and the FCC will not be very happy with you.
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Bob  AA4PB
Garrisonville, VA
KD0REQ
Member

Posts: 2399




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« Reply #3 on: April 14, 2014, 10:46:39 AM »

spark gap is no longer a valid mode of operation.  tends to fill all the bands at once, as well as adjacent services we don't get to use.
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G3RZP
Member

Posts: 1313




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« Reply #4 on: April 14, 2014, 02:49:55 PM »

Spark txs later on used a tuned antenna circuit, called a 'jigger', because it stepped up the voltage to the antenna. narrowed the signal a bit - but not much.
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AA4PB
Member

Posts: 15065




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« Reply #5 on: April 14, 2014, 03:34:20 PM »

While spark transmitters used Morse code, they weren't considered "CW".
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Bob  AA4PB
Garrisonville, VA
KB4QAA
Member

Posts: 3342




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« Reply #6 on: April 14, 2014, 04:35:18 PM »

Spark Gap transmissions were prohibited by international treaty in 1929.
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KA0HCP, ex-KB4QAA Relocated to Ks. April 2019.
AC5UP
Member

Posts: 4546




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« Reply #7 on: April 14, 2014, 04:47:18 PM »

'Twas a sad day in the history of amateur radio..... Spark gave meaning to the phrase "All Band / All Mode".

Although, there was a noticeable reduction in the theft rate of Model A ignition coils after the spark prohibition.
It wouldn't be until 1933 when amateur radio returned to its former operating style following repeal of the 18th Amendment.
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KG8LB
Member

Posts: 408




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« Reply #8 on: April 15, 2014, 03:59:50 AM »

'Twas a sad day in the history of amateur radio..... Spark gave meaning to the phrase "All Band / All Mode".

Although, there was a noticeable reduction in the theft rate of Model A ignition coils after the spark prohibition.
It wouldn't be until 1933 when amateur radio returned to its former operating style following repeal of the 18th Amendment.

   I think those were the old Model "T" Ford coils  Wink   The booster coils in wooden boxes with vibrator contacts .
The Model A Ford used the Kettering type ignition system .
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KB2WIG
Member

Posts: 635




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« Reply #9 on: April 15, 2014, 08:11:59 AM »

                                       "repeal of the 18th Amendment."

                Damped waves.

        KLC
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EXTRALight  1/3 less WPM than a Real EXTRA
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