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• •• • • • • The DECIMETER slipslick The Decimeter Slipstick fills a real need for the first time ... it gives quick accurate frequency readings on oscillators, receivers, or transmitters. The Slipstick is manufactured by UHF specialists, specifically for the UHF spectrum, using UHF techniques. •. ., t t •. ., •. ., The Slipstick has an enormous range90 to 3000 Me Rapid, direct-reading scale 2% accuracy or better Versatility-measures received signals as well as transmitter and oscillator frequencies Polystyrene insulation for low loss and permanence t Sturdy construction •. ., High-Q polished silver finish The DM-I03-W Slipstick Wavemeter is a sturdy every-day tool for the engineer and experimenter. Due to its unique design and construction, there are no spurious responses. The DM-I03-W has two modes of resonance. The low-frequency mode covers 90 to 400 megacycles and operates with a voltage maximum at the end covered by the small square plastic assembly. The high-frequency mode operates with a voltage minimum near the square plastic end and responds from 350 to.3000 Me. Above 700 Me., two or more resonant points, separated by a half-wavelength, will be found. Always read the highest frequency response. USING THE SLiPSTICK IS EASY • • • Usia the "slipstick" is easy • • • • • To measure the frequency of an oscillator, place the square plastic end of the Slipstick in the r. f. field. Slide the center rod until a sharp reaction is seen on the oscillator. This reaction will appear as a fluctuation of grid current, plate current, or output to an r. f. detector. Reduce the coupling of the Slipstick to the oscillator until its effect is just perceptible. Read the frequency at the outside edge of the center plastic assembly as marked. II W ill W To measure the frequency of a received signal, couple the DM-l 03-W to the antenna circuit. A sharp fluctuation of output from the receiver will occur when the Slipstick is tuned to the incoming signal. Do not confuse this indication with a reaction on the receiver oscillator, which may be nearby . • W = 8= In the event that the frequency of the source to be measured is not known with sufficient certainty to determine which of the two Slipstick scales to read, proceed as follows: If the high frequency scale reads 700 Me. or over, another response may be found at approximately half the scale reading. If it is found, the higher frequency reading was correct; if not, read the low frequency scale. ~ W f- lU ~ -u w c TO MEASURE FREQUENCY OF AN OSCILLATOR TO MEASURE FREQUENCY OF A RECEIVED SIGNAL IF FREQUENCY OF SOURCE IS NOT KNOWN If the high frequency scale reading is less than 700 Me., set the DM-I03-W to resonance in the circuit and touch one of the silver rods with the tip of a lead pencil just outside of the square plastic assembly. If a considerable reaction on the resonance is noted, read the low scale; if little reaction, read the high scale. REMEMBER, this procedure is necessary only if the frequency is not even approximately known in advance, and only when the signal source is known to be capable of supplying either high or low frequency. I.MATEUR N~T PRICl: $16.50 FINDING PROPER SCALE READING IS SIMPLE FOIl AMATEURS ITislMPIEI To transmitter, plug a 13 em. a 2C40 tube into the DM-240-A oscillator, make filament, tions-you're make plate and antenna connec- ready to go! I"EAII'! To make a recei'Yer, use the DM240-A oscillator as a superregen detector in the usual separatequench circuit. Or use it as the H. F. oscillator in a superhet! IT' FUN! new phenomena these frequencies. New DX records are waiting to be made; are to be disco'Yered; new uses are to be found for TECHNICAL DATA ON DM·240·A OSCILLATOR FEEDBACK CONSTRUCTION A small feedback loop is built into every DM240-A oscillator. This loop extracts a small amount of energy from the grid-plate dircuit and couples it into the grid-cathode circuit. The amount of feedback is controlled bv a shaft on the side of the oscillator. No adjustment of this control is necessary for receivers over the whole tuning range. For transmitting, it is adjusted to obtain maximum plate efficiency. The DM-240-A oscillator is constructed of brass throughout with heavy silver plating overall to assure low r.f. losses, low contact resistance and long life. The outside is finished in a lustrous brown wrinkle to afford maxi mum heat radiation and consequent low plate seal temperature. The oscillator is assembled by high precision methods to provide absolute concentricity of contacts, eliminating tube strain and providing maximum r.f. efficiency. High-frequency power is taken from the oscillator by attaching a piece of RG-8jU or similar cable to the output coupler at the top of the oscillator. The output coupler may then be rotated and locked in the position to give maximum output. As a receiver, the same procedure is followed and the coupling adjusted to give best sensitivity. If desired, a dipole antenna may be attached to the oscillator without intermediate cable. The power output of the DM-240-A oscillator is sufficient to assure communication over any line-of-sight distance. The DM-240-A oscillator consists of two major tuned coaxial circuits. One circuit is from grid to plate and the other is from grid to cathode. Both circuits are electrically three-quarters wave-length long and are carefully proportioned to suppress spurious modes of oscillation. Firm slotted connectors provide excellent contact to the 2C40 tube, and maintain the high Q of the coaxial lines. POWER REQUIREMENTS The filament of the 2C40 tube operates on 6.3 volts a.c. or d.c. at a drain of only 0.75 amperes. The plate supply is 250 volts, 20 ma. maximum. The low drain of the DM-240-A oscillator makes it ideally operated from the power supply of any automobile receiver, or from light-weight batteries. FREQUENCY RANGE The nominal tuning range of the DM-240-A is from 2000 to 2500 Mc. Due to small variatl0ns among 2C40 tubes the range may be slightly different, but will never be more than 25 Mc. off. All oscillators are guaranteed to cover the amateur band from 2300 to 2450 Mc. Since the DM-240-A is a triode oscillator, any modulation method ordinarily used with triodes is satisfactory. Heising modulation using a 6V6 or 6F6 is simple and effective. Both r.f. circuits are tuned by screw-type capacitors inserted at a voltage "loop" in each circuit. Standard quarter-inch shafts protrude from the oscillator housing so that any type of knob may be attached conveniently. The grid-plate tuning is the primary frequency adjustment. The gridcathode tuning is relatively broad, and need be altered only when large frequency ranges are to be covered. Due to the vernier effect of the screw-type tuners, setting of the oscillator frequency is easily done without fussy "hair-line" tuning. ANTENNAS One of the greatest advantages of 2400 Mc. operation is the tremendous power concentration possible with directional antennas of small size. Yagis, stacked arrays, rhombics, parabolas and corner reflectors are constructed with little effort for this frequency, and power gains of 20 to 100 are easily realized. Since a dipole is only 2f' long at 2400 Me., the small size of a directional antenna can be readily visualized. Look for these Decimeter products coming soon DM-240-F -Precision DM-120-A -Oscillator DM-120-F -Precision DM-I03-W-Reaction DECI Wavemeter for 13 cm. band. for 25 cm. band. Wavemeter for 25 cm. band. Wavemeter for 100 to 3000 Mc. M ETER I.' ] c.,.; INC. 1430 MARKET ST., DENVER 2, COLORADO, U. S. A.