![]() I did clean the four binding posts and the switch in the CR-1 with Deoxit. Falk (Dictograph), Aug 16, 1910, 381/344 - better shape to transfer more sound energyġ356634 Rheostat for Telephonic Insruments, Henry Koch (Dictograph), for hearing impaired usersġ361590 Telephone Transmitter, Henry Koch (Dictograph), Dec 7, 1920, 379/428.01 191/12.Well, it was in the twenties and very windy outside today so after conceeding that I am not in my teens anymore, I decided to stay inside instead of stringing up a longwire antenna outside. #Heathkit cr 1 freeP = V*V /R = 0.08 * 0.08 / 4000 = 1.6E-6 watts or 1.6E-3 mW or 28 dB below 1 mw or close to 1 micro W.Īn exponential horn (Wiki) is the best way to match free space to the driver.ģ31 s/n stamped in bottom wood in additionĭictograph Patents967747 Transmitter Mouthpiece, O.F. #Heathkit cr 1 serial numberThe guarantee on this Speaker does not hold if serial number of bottom of cabinet is in any way defaced.įE50FreqResp.avi Video of frequency response. Occasionally, if a Radio Speaker is placed in a small room or in a room in which the reflection of sound is very great, a sustained howling may be produced, and this may be overcome by separating the Radio Speaker from the receiver by putting a small piece of cardboard under the Radio Speaker to raise it from contact with the top cover of the cabinet, or it may be necessary to remove the Radio Speaker from the top of the set and put it on a table alongside the set. In the event you should ever obtain a persistent howl, it may be due to: Leave the Radio Speaker permanently connected with the connetions giving best results. In one of these positions the signal may be clearer and louder than in the other. Try the Radio Speaker with it's leads connected to the telephone plug (or the receiver binding posts) in one way, then disconnect and reverse the Radio Speaker leads. In connecting up this Radio Speaker for the first time, it is important ot get the polarity of this Radio Speaker correct. The Radio Speaker should preferably be placed directly on top of your receiver as shown in the accompanying figure. Do not under any circumstances tamper with the unit. This Radio Speaker is equipped with a reproducing unit which does not require any adjustment at all. There's a small amount of interaction between the antenna circuit and the tank, but not a lot.Ĭaption under photo of speaker sitting on top of radio: The best way to tune is first set the tank where the station will be then peak the antenna circuit. With a 100 foot long wire this receiver picked up all the AM broadcast stations you would hear on a regular table radio. ![]() Uses a 1N34 diode and hi impedance (old) headphones. The tank is composed of the three section air variable cap and the other part of the standing coil. ![]() The antenna circuit has a coil that couples to the tank circuit, but there's no metallic connection between the antenna circuit and the tank circuit. ![]() ![]() The antenna and ground (must have a good ground) are connected on the back. The idea is to resonate the external antenna. A clip lead not in the photo is used to connect to one of the taps. The antenna circuit consists of the range switch on the left, the tapped coil (horizontal over red earphone binding posts) and the two section air variable cap on the left. The cardboard box has suffered from both the time and having stuff on top crush it. This was during a time when I was spending a lot of time with the Boonton 160 Q meter and making a number of coils. This radio was made in the late 1960s or early 1970s. ![]()
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