Irw

Figure 22 Fifth-overtone oscillator from The ARRL Handbook. Cs, 10 pF L1 97a turns on 0.10 inch ID, tight wound L2 15 turns 28 enameled wire on T-25-6 core for 90 to 100 MH2 range. Cs, 6.8 pF L1 7 h turns and L2 13 turns for higher range. A means of electronic tuning for phase locking has been added at Vtune. Figure 22 Fifth-overtone oscillator from The ARRL Handbook. Cs, 10 pF L1 97a turns on 0.10 inch ID, tight wound L2 15 turns 28 enameled wire on T-25-6 core for 90 to 100 MH2 range. Cs, 6.8...

Rf

Assembling a 10-Band 50 MHz to 10 GHz Station As Jon Jones pointed out in his recent NCJ column, one of the keys to doing well in ARRL VHF contests is to operate as many bands as possible.1 (See Fig L) I've done pretty well with my station it's normally one of the top QRP stations in the New England area To encourage more people to activate stations on the higher bands, I'm describing my particular station, which was initially assembled in the late 1980s. The most important aspect is site...

Info

*See text for an explanation of AR and AX. Conclusions and Implications Because there is 110 independent standard at hand against which to measure the modeled results, the MININEC figures for the single quad loop cannot be certified as in fact closer to reality than those yielded by NEC-4 for antennas constructed of different-diameter wires joining at right angles. However, MININEC's achievement of reasonable convergence of results and NEC-4's inability to achieve converged results suggests...

Measurement of Signal Source Phase Noise with Low Cost Equipment

Do you want to explore phase-noise performance, but don't have a kilobuck for equipment Learn how to make those measurements with relatively simple, inexpensive equipment. There are several methods for measurement of phase noise on signal sources. The methods require various degrees of sophistication in the test equipment used. Some of the techniques are listed below in order of progressive complexity, accuracy and cost. 1. Listen to the noise on a communication receiver (as you are forced to...

Technical References

The Electronics Handbook Jerry Whitaker, editor The largest electronics reference book published, 2500+ pages. Electronics Engineers' Handbook 4th edition, Fink and Christiansen, editors Comprehensive data on all branches of electronics, 2400 pages. Reference Data for Engineers 8th edition, Mac Van Valkenburg, editor Reference book with a long history of RF emphasis, 1439 pages. The 1998 ARRL Handbook Paul Danzer, editor The classic amateur radio and practical engineer's handbook. Antenna...

QEX

The system, but can also incorporate any predictable errors from the detectors and other sources. Fuzzy reasoning tends to overcome errors in systems that can provide only roughly accurate absolute measurements, but produce good relative resolution. In the case of the ATU, the accuracy of the phase detector degrades rapidly when SWR is less than 1.3 1, and we must rely solely on the reflection coefficient to guide us. A certain amount of thrashing about must be employed to find the minimum SWR....

E

Fig 3 Dipole conductance vs. frequency (29 unknowns). 18 QEX Fig 4 Dipole susceptance vs. frequency (29 unknowns). tionally symmetric antennas were greatly reduced. The transpose elimination algorithm was available as a user-selectable option to allow computation of larger problems up to 50 wires and 90 current samples or 190 segments were permitted without recompiling. Many others have also attempted to improve on MININEC. Most notable are the innovative user interfaces and graphics displays...

Spot

FREQUENCY OFFRET FF OH 155 0 11Hz Cn.RRIER Figure 2 Phase noise of a Marconi 2024 signal generator, followed by a clean-up filter and displayed on an HP 8560E with Phase Noise Utility software for controlling the display. FREQUENCY OFFRET FF OH 155 0 11Hz Cn.RRIER Figure 1 Phase noise of an HP 8640B displayed on an HP 8560E spectrum analyzer with Phase Noise Utility software for controlling the display. Figure 2 Phase noise of a Marconi 2024 signal generator, followed by a clean-up filter and...

Qrm

This is supposed to be the level where the third-order IMD product is equal in amplitude to the interference. Were we to actually inject interference of this level, however, we might find a real IP3 much higher receivers seldom obey perfect cube laws as they're predicted to do This normalized procedure is a good basis for comparison, though. In the second-order test, we inject two non-harmonically related signals and look for the undesired product at the sum or difference of the frequencies....

8640b Phase Noise

Display it directly on a spectrum analyzer. These first two methods, while simple, are limited to measurement of sources with high phase-noise levels, due to dynamic range restrictions in the receiver or analyzer caused by the measuring instrument's own phase noise. 2a. Use a narrow notch filter to attenuate the carrier, while allowing the phase noise to pass for observation on a spectrum analyzer. 3. Mix the test signal with a reference source to produce a lower frequency. Then filter the...

Mcl

Sra Receivers

Figure 16 A frequency upconverter to allow use of a power meter or communication receiver for the display and measuring device in Figures 7 and 8. Figure 16 A frequency upconverter to allow use of a power meter or communication receiver for the display and measuring device in Figures 7 and 8. Pri, 26 t no. 26, sec. 7 t no 26, on T-50-2 core Pri, 26 t no. 26, sec. 7 t no 26, on T-50-2 core Figure 17 An upconverter suitable for use with a communication receiver for measuring the noise output...

The American Radio Relay League

The American Radio Relay League, Inc, is a noncommercial association of radio amateurs, organized for the promotion of interests in Amateur Radio communication and experimentation, for the establishment of networks to provide communications in the event of disasters or other emergencies, for the advancement of radio art and of the public welfare, for the representation of the radio amateur in legislative matters, and for the maintenance of fraternalism and a high standard of conduct. ARRL is an...

M

Fig 3 CW wave shaper for the ICOM IC-202. C2, C3 0.82 mF high-quality capacitors for low-frequency timing circuits Digi-Key14 P4674-ND . range. I took out the attenuator and switch to reduce the chance of operator error it is too easy to leave switches in the wrong place late at night. The VFO is just an 8 MHz VFO mixed with a 42 MHz crystal oscillator probably not an ideal choice of frequencies, but I had some high-quality 42 MHz crystals from a previous project. The homebrew 6 meter...