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RADIO AGE for January, 1927
1 he Magazine of the Hour
Front panel view of the Microflex, showing the switch located £t center of panel
Experimenter Has Choice of Four Receivers in One
k NOVEL combination of a Z\ tuned RF receiver, with a *■ ^-regenerative detector and two stages of audio, which can also be made into a straight regenerative and two of audio, RF, detector and one audio, and regenerative and one audio, is
cuit tuner on the market.
While for local work the set works best with just one stage of audio amplification (using Thordarson's R200 audio transformers) , — for distant work, — and that is what most of the fans are interested in, the two stages
Rear panel view shows the two Micro-couplers, sockets, and all other parts used in this set
found in the Microflex which has been built around the Microcoupler made by the Simplex Radio Devices Inc., of Newark, N. J.
Thus the experimenter is enabled to have four sets in one, the change-over being accomplished by a four pole double throw switch located in the center of the panel. This by its action makes the set either a straight regenerative, or a RF and regenerative combined. One of the coils is mounted on a micrometer action which permits minute inductive relationship changes, something heretofore lacking in the ordinary three cir
should be used, circuit on this
The schematic page shows the
method of hooking up the set to jive four receiver combinations.
For the change-over switch either a Yaxley, Carter, or Federal four pole, double throw panel switch may be used. The first two named are made in the single hole mounting type, while the Federal requires a cut-out of the panel for insertion.
Remler condensers are used for the tuning which obviate any possibility of body capacity due to the insulated stator and rotor. Because of the precise control of coupling afforded by the use of Micro-couplers, the over all efficiency of this receiver is greatly increased.
The receiver covers the conventional broadcast band from 200 to 550 meters, and should be able to provide any degree of selectivity desired by the builder.
Schematic circuit of the receiver described showing four combinations possible