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Its incredible performance, robust construction and high reliability made it the "standard" for all maritime receivers that followed. It was also possible to use electro-chemical interrupters along with a high voltage transformer, however, most transformer operated stations used rotary gaps, like those shown next. Dates from around to Though machines were used to make the various parts, since the machines were operated by hand, the resulting parts do have variations. The CR-9 is also a single-circuit tuner with regenerative detector but also included in the circuit is a two-stage audio amplifier. There are many other variations between the two versions and almost any example will differ from another in some small detail. The amplifier used hard-amplifier tubes, the UV I have performed three restorations on the set over the years, each one more complete and more original than the former one. Later versions eliminate the TC switch and the binding posts use bakelite caps. These "stationary gaps" were used in spark transmitters where the source of the charging voltage was a "spark coil. He was only 11 at the time but he was able to construct quite a nice Loose Coupler using the oak boards from a discarded bed frame. Using a rotary gap in the secondary circuit gave the advantage of audio frequency modulation. Kennedy history and history of each receiver, operation of the equipment, restoration suggestions and interior photos of the equipment plus an article on Dr.
There were some commercial users, especially early broadcast stations where the receivers were used as emergency frequency monitors required by early regulations. Kennedy - "Radio Apparatus of Quality" in the navigation index below. Construction is heavy-duty, quality is first-rate and the performance is incredible. Although the restoration used several replica and non-original parts, authentic vintage material and techniques were utilized in the rebuilding of the receiver. The Navy wanted a receiver that was capable of operation in the presence of nearby spark and arc transmitters. This particular receiver was originally used aboard the Matson Line steamship S. Its incredible performance, robust construction and high reliability made it the "standard" for all maritime receivers that followed. Kennedy receivers were found in many early broadcast stations as emergency frequency kc monitors. Kennedy history and history of each receiver, operation of the equipment, restoration suggestions and interior photos of the equipment plus an article on Dr. Dating the Audion Receiver to was arrived at by noting that the circuit is non-regenerative - regeneration became popular in The sensitivity was a bit better than a modern germanium diode. Franklin was one such parts house that offered the Klitzen No. Adams-Morgan took full advantage of the advertising potential of the Tests claiming the Paragon had received all of the ham stations. Most were removed from ships during the late-thirties to early forties. Three-circuit tuners are difficult to operate correctly but can provide excellent sensitivity and selectivity. This complete shielding also eliminated stray pickup. Spark was certainly on the way out by but John was able to make a few contacts and hone his ham skills. The approximate date of seems likely for this receiver. All screw and nut joints are soldered after tightening at assembly. Later versions eliminate the TC switch and the binding posts use bakelite caps. On the lower right side of the panel is a dual control the outer knob of which varies the coupling via a bell crank while the inner knob selects the secondary turns. Kennedy - Type - Universal Receiver The ultimate in quality and performance for the experimenter or radio enthusiast. A ham friend of mine traded a telephone pole for it and then sold it to me. Godley redesigned the tuner using a variable condenser in the secondary circuit and a variometer in the plate circuit and this became the RA Though most of the stations were actually received on Godley's homebrew superhet, an RA and a proto-type DA-2 were set-up on the receiving table in Godley's tent at Ardrossen. The design request came from a former Hazeltine student who was now in charge of receiver development at the Washington Navy Shipyard. Wavelength coverage is from meters up to meters kc down to 40kc, though most receivers tune from kc down to
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