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

Transmitter output power : 500 watts
Tx Frequency Range:  Known to have operated at 682 KHz.
Rx frequency range:  ?

Transmitter tube count: ?

Receiver tube count.:   1 x V24 for RF amplification; 1 x V24 for audio amplification and 2 x QX valves for detection.
Type QX valves were identical to Type V24 valves but with a tighter grid pitch. The Type Q valve had a number of serious problems including a high value of anode resistance and a difficulty in mass-production and hence, in 1921, their replacement, the Type QX, was introduced. This valve was a redesigned Type Q valve but almost identical in construction and structure to the Type V24 valve. Type QX valves worked well at lower anode voltages (compared to the Type Q) and proved a better complement to the V24 in (later) receivers using both types.

Mains Input power:  75 VAC plus a 6 VDC battery
Primer mover : Gasoline engine or electric motor.
Transmitter HT:  6000 VAC before rectification by a Flemming valve.
Country of origin: UK
Comment: This set, imported from Marconi UK,  is known to have been used on a temporary basis at station CFCF in Montreal, Quebec
 
 

The complete YC-3 set using a motor-altenator as the prime mover.  In this configyration, the transmitter at the left is covered with a wooden grille, the same type as commonly used as flooring in small inboard engine motor boats. Unless otherwise noted, all information  in this document has been extracted from the Canadian Wireless June 1922 periodical and provided by Lewis Bodkin.

 
 

	This schematic shows the complete CW circuit in the YC-3 transmitter. Click on thumbnail to enlarge.
	This schematic shows the complete phone circuit in the YC-3 transmitter. Click on thumbnail to enlarge.

Taken  on July 18,  1922, boxer Jack Dempsey( light coloured suit)  addresses a radio  audience in the Montreal area from station CFCF. Note the huge horn microphone. The gentleman on the right is T. Darling, CFCFs broadcast engineer. To his left is the British YC-3 transmitter without the protective grating over the transmitter tubes. (Photo from Canadian Wireless July ., 1922).

 

Contributors and Credits:

1) Lewis Bodkin  <05bodkin555(at)gmail.com>
2)  QX valve   http://www.mhs.ox.ac.uk/collections/imu-search-page/record-details/?TitInventoryNo=32090&querytype=field&thumbnails=on
3) https://www.ultra-tcs.com/files/Marconi_Radio_History_LV.pdf  page 27/37
4)  Denis.Couillard@Ultra-TCS.com

Dec 4/19