Professeur Jacquemard Poste a Galene

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A bit of a mystery this one, I am hankering to build a breadboard repro of the set if only to play with this bizarre (to me) circuit.

data and information on the set is not small, but not enough:

from the schematic:
L1: form 25mm dia, 68mm long selenoid, 170 turns 4/10 wire
calculation- 0.4mm-26awg wire, 220uH coil
L2: ID 25mm, W 8mm. OD, #turns, guage not given
L3: ID 20mm, OD 34mm. W, #turns, guage not given

estimation from photo:
L2: OD about 32-35mm, wire guage is small in the 32+ range
L3: W maybe 6-8mm, wire guage is small in the 32+ range

from book:
MW = 545 - 1500 Kc
LW = 157 - 272 Kc

from calculations:
MW tuning with 220uH typically 365 - 450 pF

from clues in the two publications
1. most Vcaps are 450pF
2. most GO coils 120turns x two coils

calculations from above:
LW tuning with assumed 450pF cap is 2300 - 2400 uH


The following photos show the set and the references mentionned above.

(some useful translations for my anglophone friends:
PO = Petits Ondes = Short waves [so named prior to the utility of the HF bands was known]
GO = Grandes Ondes = Long Waves
Bobine Addition = Additional Coil)


Jacquemard Schematic and layout..


Circuit Analysis/Redraws of above..


Innards Photograph from an actual set..


A link back to my Crystal Radio Pages found here:
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Thursday, 23-Nov-2017 20:09:27 CST

Comments and/or Correspondance to: kevin smith


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