Classic superregerative and regenerative "Portable Radio" with CW and Class B modulation for AM


This radio is marked "Field Day 1934". It is signed "James Millen", "T.O.M. (The Old Man?), "1AW" (No, not W1AW), "R.H." (Ross Hull?), "S.R. Beardslee", "W8CWN" (W8CWN is not shown in the list for 1934 FD participants--W8CWH apparently is) "Camp Vail" (No, not Fort Monmouth), "AARS" and "MAJ T.C. Rives".


Currently under total restoration by WA6PRL--has been for three and a half years!


This station is very unique in that it is complete and runs CW and Class B modulated AM phone. Of particular interest to me is the way it can be set up as a Dallin-Halco receiver with hetrodyne injected super-regeneration for CW work. See the January 1927 QST for an explaination of this concept. The RF power output is about two watts using a 19 final driven by a 33 with a 19 class "B" modulator driven by two 30"s in series. The receiver is a 1A4P RF amplifer, 1B4 detector, 30 Quench oscillator, 32 hetrodyne oscillator, 30 first audio and 33 audio output. There is an antenna tuner included. All coils are plug in. The original "drift-a-matic, chirp-a-matic and FM-a-matic split coil Colpitts has been replaced with a modifed Pierce with crystal control. The station covers from about 500 Kc to 14.5 Mc. with plug in coils.





OTHER PHOTOS


FRONT SHOT IN STUDIO "G" FOR GARAGE

ANTENNA TUNER PI NETWORK

TRANSMITTER COMPARTMENT WITH MODULATOR AND RECEIVER AUDIO AS WELL

RECEIVER COMPARTMENT WITH DETECTOR AND QUENCH OSCILLATOR--RIGHT CALIBRATION AND BFO

RF AMPLIFIER COMPARTMENT

TRANSMITTER COMPARTMENT/RX 2ND AUDIO AND AUDIO POWER/TX CRYSTAL/OSC AND PA

REAR VIEW WITH COVER REMOVED OF SPEAKER COMPARTMENT AND COIL STORAGE COMPARTMENT

BATTERY COMPARTMENT WITH TWO AC POWER SUPPLIES NOT YET SECURED

MODULATOR UNDER REBUILD--MODERN TOROID CHOKE ON TRANSMITTER FILAMENTS

RX AUDIO AREA--SEALED AUDIO FILTER REPLACED COMPLEX MULTI-CHOKE AND CAPACITOR DESIGN--SAME FUNCTION

RX AUDIO AND DETECTOR WIRING

RX AND RF AMP WIRING/POWER TERMINATIONS/ADDED CHOKES AND CONDENSERS/MODERN MOLEX TO ALLOW REMOVAL AND SERVICE

CASE WITH MICROPHONE SHOWING OSCILLATOR AND PA BIAS ADJUSTMENT KNOBS AND SPEAKER

STUDIO "G" WHERE THE "LIGHT" WORK IS DONE

ANOTHER SHOT OF STUDIO "G"

Another shot with back cover off/tuner and transmitter section

Another shot with back cover off/calibrator and RX section

Another shot with back cover off/calibrator and RX section and RF amp

Another shot with back cover off PI Net tuner

Another shot with back cover off/transmitter section with mod tubes out

Another shot with back cover off/oscillator on right and PA on left--adaptor for FT-243

Another shot with back cover off/calibrator and BFO on right/TX osc on left

Another shot with back cover off/Oscillator with RX audio tubes in shields

Another shot with back cover off/Main Regen and Super Regen section looking down