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File:National Guard operating portable radio station 1922.jpg

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between 900 m (330 kHz) and 1500 m (200 kHz). It uses VT-1 triodes for receiving and VT-2 triodes for transmitting, and has a range of about 100 miles with 320 V on the transmitting tubes.
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TRANSMITTING IN THE FIELD: The power for operating this equipment is furnished by the hand generator. Note the collapsible metal mast that serves as a support for an umbrella antenna
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
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The following pages on the English Knowledge use this file (pages on other projects are not listed):
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occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See
285:. This applies to U.S. works where the copyright has expired, often because its first 105: 366: 177: 480: 282: 277: 180:. The source (p. 58) says the equipment is an SCR-99, which can transmit on 169: 166: 501: 286: 411: 181: 173: 218:, Popular Radio Inc., New York, Vol. 2, No. 1, September 1022, p. 53 437:
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Alterations to image: removed caption text from background.
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Alfred M. Caddell, "Radio fans who are paid to learn" in
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National Guard operating portable radio station 1922.jpg
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File:National Guard operating portable radio station 1922.jpg
776 × 599 pixels
311 × 240 pixels
622 × 480 pixels
995 × 768 pixels
1,280 × 989 pixels
1,344 × 1,038 pixels
Original file
Wikimedia Commons
description page there
You can help
electric generator
vacuum tube
transmitter
Morse code
telegraph key
wavelengths
Alfred M. Caddell, "Radio fans who are paid to learn" in Popular Radio, Popular Radio Inc., New York, Vol. 2, No. 1, September 1022, p. 53
public domain
United States
publication
this page
rule of the shorter term
Knowledge:Public domain
Knowledge:Copyrights

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