Paraset Radio Power Supply

Picture of the norweigean oluf reed olsen s set.

Paraset radio power supply.

4a jpg hd 7a jpg hd 8a jpg hd the power supply is very compact in a great box. One of my ham radio buddies calls this the paraset mini cooper. Orange by musmus http musmus main jp. I tested the power with a breadboard transmitter with nearly the same circuit as the paraset.

Some differences were made during the war. It has 2 of the 12ba6 tubes for the regen radio and 2 of 12aq5 s for the little cw transmitter. The paraset would have been our ideal radio. Please communicate in english.

I started with the power supply and voltage divider lower left of the photo i wanted to test the linear regulator for the 6 3v filaments as well. This forum is all about building and using world war ii spy radio equipment in particular the whaddon mk vii paraset. It has no screenprint. Input to vibrator 2 2a.

With a 12v6 the output was nearly 4 5w 50ma and 1 8a from battery. Blueprints from on6wj jos warnier. The switch is the 80 40 meter bandswitch. What organization used this radio in 1953.

And with a main power supply. The transmitter has the paraset style parallel series tuned tank circuit and seems to load well even with a random length wire antenna. The power supply delivers 6 vac and 350vdc. The paraset is described in some detail in a book secret warfare adapted by david kahn who translated it from the original french book written by pierre lorrain.

I made a power supply for my portable tube radio emerson model 850. Since it s small qrp power and size and operates on two of the current ham bands it seemed ideal for my glow bug project. There is also a nice all brass key connected to the rig out of the photo to the left. Power supply for mk vii.

Paraset schematic from radio communication 1982 pdf on5lj s drawings. A search for more information soon revealed that the paraset was a small vacuum tube transmitter receiver unit built during wwii in the uk at the whaddon hall headquarters of the secret intelligence service communications unit. The method to wiring this radio was done in stages. Vii also has a 6 vdc power supply included with it which connected to a car battery via large alligator type clips.

12v 24ah battery is used. Consisting of transformer rectifier tube 6x5gt and a capacitor. For other radios separate forums can be set up ask the quartermaster. The only real issue i had with these circuits was the linear regulator would not start with all three tubes.

With a test of the 12a6 the output was about 2 2w 40ma at battery current of 1 5a. Background i first heard of a paraset when i saw a message on the qrp l reflector announcing an upcoming june 6th paraset d day activity. Paraset in norway. The power supply is also tested september 15 1953 the power supply is very simple.