YB-1 Portable Valve Transmitter and Receiver

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SPECIFICATIONS

Use: For any application where it was necessary to have a radio installation on a temporary basis.
Modes: CW, MCW (Tonic Train emission in those days) and Phone.
 

TX Frequency Range: 300 to 900 metres (1000 to 333 KHz respectively)
Rx frequency range:  300 to 600 metres ( 1,000 to 500 KHz) and 500 to 1,100 metres (600 to 272 KHz)

Transmitter tube count:  One MT-3 tube used as an oscillator The power supply, being DC means that  no rectifier valve is needed.
Receiver tube count.: 4 valves. Two V24s were in the  RF amplifier stages. A  'Q' valve was used as a detector. and there was also a note amplifier (audio output)  stage. The  YA1, YB1 , YC3 , and YC4 transmitter/receivers  all used a "Q" valve as a detector and V24 valves as RF amplifiers.  Both valves were first made in 1916 so these sets were made after that date.

Input power: 100 watts  just for the transmitter alone.
Primer mover : A 1 HP gasoline engine
Transmitter HT: 1,500 VDC derived from a DC generator by the prime mover
FIlaments: Powered by a rechargeable battery which could supply 12 VDC at 10 amps.
Range:  With an optimum  antenna system - 35 miles on phone; 50 miles for MCW and 100 miles on CW.
Comment: Supplied with the set are two 30 foot steel masts, gauze nets to be used as a ground plane  and antenna wire , Each mast  had eight sections.
 

YB1 combination.  (Photo provided by Lewis Bodkin)

MT-3 valve Type: Transmitting Triode, Filament: 6 Volts @  2.2 amps Circa: 1919 Comment: Ediswan is probably producing until 1919 when production went to Osram in June 1919. Tube was still listed in the 1932 Marconi Transmitting Valve catalog. (Courtesy of Radiomuseum.org)

Contributors and Credits:

1)  Lewis Bodkin  <05bodkin555(at)gmail.com>
2) https://www.radiomuseum.org/tubes/tube_mt3.html
3) Handbook of Technical Instruction For Wireless Telepathists
 

Mar 4/.09