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October 2011 [Feedback] Don't Forget The Little Guy I have been a reader of Microwaves & RF magazine for many years and have enjoyed your technical articles and Product Features, although I would prefer that the stories about products would include more opinion and insight on these products, such as the “feel” of using a new microwave vector network analyzer (VNA), like the millimeter-wave system recently featured in the September issue. September 2011 [Feedback] Sideband Suspicion I was disappointed to see the article “Sidebands Are Not Necessary” (August 2011). This work has been debunked in several places, one of them being a good article on the web by Phil Karn. As the published article makes a rather outrageous claim, “sidebands are not essential for transmission or reception,” it deserves a lot of scrutiny before being published. Please do a better job... September 2011 [Feedback] A Good Idea At The Time A long time ago (1978-79 timeframe), I worked at RCA in Burlington, MA as an RF design engineer. I was on a team to develop an 18-GHz frequency extension for a US Army depot automatic test set, known as EQUATE. The senior member of the team, Mr. Edwin Richter (deceased), was a brilliant scientist-type who showed me an original paper he wrote on the subject of analog frequency synthesis using mixing techniques. The paper dealt with... August 2011 [Feedback] Let's Treat Leeson Right Your June issue featured an interesting article by Eoin Carey on the effects of VCO tuning bandwidth on phase noise. The article proposed that the phase noise of two otherwise similar VCOs that were based on the same design approaches and technologies would differ according to their tuning bandwidths. The article based its analysis on the well-known equation for phase noise presented by D.B. Leeson in 1966 (“A simple model of feedback oscillator ... August 2011 [Feedback] Setting The Record Straight In a recent Microwaves & RF newsletter, we noticed that you referred to our company as “Richardson Electronics.” July 2011 [Feedback] Alive And Thriving In a previous issue of Microwaves & RF magazine, an incorrect statement saying Polyfet RF Devices is no longer in business was made. In actuality, nothing can be further from the truth. Polyfet RF Devices is alive and doing well. Polyfet RF Devices has been manufacturing RF power MOSFETs since the company’s inception in 1987. Our company has met many industry milestones since that time. In 1995 we were one of the few companies... June 2011 [Feedback] Transistor Omission TRANSISTOR OMISSION We read your article “Transistors Energize Solid-State Amplifiers” in the April edition of Microwaves & RF with both interest and disbelief, as Integra Technologies isn’t mentioned once—despite having been in business for 14 years and having advertised in your magazine on a number of occasions! Integra Technologies has substantial global sales, is arguably the worldwide leader in high... May 2011 [Feedback] Let's Get History Right LET’S GET HISTORY RIGHT I enjoyed reading your “Microwave Memories” column in the March Microwaves & RF, until I got to the last paragraph describing the near-palm-sized newly released varactor diode circuit. For your information, the “circuit” is not a circuit at all. It is a tray or carrier containing a 10 x 10 array of varactors, each about 0.1 in. in diameter and... April 2011 [Feedback] More Ham Memories, Part 2 Editor’s Note: In last issue’s Feedback section, longtime Microwaves & RF reader Robert R. Kornowski recalled a early encounter with a ham radio operator—one that would have a profound influence on his future engineering career. This month, Kornowski continues his reminiscences. Over the next few years, it was my good fortune to be mentored by local hams in the art of radio technology as an associate member of the Green Bay... March 2011 [Feedback] More Ham Memories Your Editor’s Note in the December 2010 issue of Microwaves & RF Magazine regarding the role that ham (amateur) radio played/ plays in the development and evolution of RF engineering triggered a cascade of memories that I think you might find interesting. Upon finding and somehow fixing a Table- Model Aetna Superhetrodyne Broadcast & Short-Wave Band Radio Receiver in the basement of my home in the early 1950s, I... December 2010 [Feedback] Feedback To The Editor I read your editorial, “Ham Radio Is Alive And Well” with interest in the October issue. When I saw the previous reader feedback I didn’t respond, though I suppose I should have as I knew something was amiss. But, because of your “correction” I must pipe up. Much ado over the years has been made for amateur (ham) radio’s involvement in emergency communications as well as “hobby radio,” and for the right reasons.... November 2010 [Feedback] Feedback Hamming It Up Dear Mr. Browne, AS AN EE, a long time Microwaves & RF subscriber, and an active ham for over 45 years, I am more than pleased to see that you corrected the error in the Microwaves & RF Update newsletter. In fact, I commend you for revising the information and placing it in plain view (October, p. 17). These days it appears few are willing to admit mistakes. Thankfully, you are not one... October 2010 [Feedback] Feedback Revised Data Dear Mr. Browne, Your on-line editorial in the September 23 Microwaves & RF Update e-newsletter, “Amateur Radio Ranks Are Shrinking” (visit www.mwrf.com) had faulty data or biased observations. The numbers of FCC-granted amateur radio licensees have been in a sort of stasis since their peak of 737,938 on July 2, 2003. As of Sept. 24, 2010 the total... September 2010 [Feedback] Feedback To The Editor: First of all, I would like to thank you for sending me your publication. I have been a reader of Microwaves & RF since it changed its name from “MicroWaves” and have usually found at least one article of interest in each issue, and often something that was of value to me professionally in my work as a radar systems designer. I have noticed in several of your recent issues, notably in June, that you have... August 2010 [Feedback] Feedback Continuing The Discussion In the June issue of Microwaves & RF, I presented my request to clarify Fig.1 in the article, “Antenna Assists MW Power Transmission”. The author failed to respond and explain it, and I still do not understand it. In describing the figure, he wrote that the DC... July 2010 [Feedback] Feedback Author’s Response I thank Mr. Polivka for reading my paper (“Reader Feedback,” June, p. 13). Yet I’m concerned that Mr. Polivka does not understand the arrangement of my rectenna (Fig. 1). I’m not sure why he is talking about single phase and efficiency of 50 percent. In this paper, we have done new research and it is not a copy of ref. 14. It should be noted that refs. 7 and 15 provide an RF conversion efficiency of about... June 2010 [Feedback] Feedback Dear Mr. Kumar: With interest I read your paper in the MWRF May issue, “Antenna Assists MW Power Transmission.” I am not sure if I understand the arrangement of your rectenna in Fig. 1. In fact, the antenna is loaded with a Schottky diode; the capacitor and tuning stub seem to me to be on a wrong side of the antenna-detector combination. The “Load” is possibly the DC load. On p. 73 you refer to the design by Bharj et al. who designed a... May 2010 [Feedback] Feedback I followed your article (“Forecast Rain Effects On Microwave Links,” April, p. 78) in your attempt to show readers how to forecast rain effects in microwave terrestrial and satellite links. I have studied microwave propagation in the atmosphere with precipitation and know the theory behind it. I did an interesting science by using microwave radiometers in emission mode to obtain loss... April 2010 [Feedback] Feedback To The Editor: The article in the January 2010 issue of Microwaves & RF entitled “Match Loop Antennas Via Mutual Inductance” is a rehash of the old loop-coupled loop. This was invented by Dunlavy and patented in 1971. Both loops have small radiation resistances and individually low efficiencies. The overall efficiency is essentially the product of the two loop efficiencies, and this number will be very small.... March 2010 [Feedback] Feedback Finding The Missing Piece Mr. Browne, Your article in the March 4 MWRF UPDATE e-newsletter titled, “Making Wireless ICs A Commodity,” got off to an interesting start. But it appears to have been cut short on the MWRF web site. Is it available elsewhere? Best regards, Steve Preston Hi Steve, Thanks for asking, and for reading. I’ve been hearing from folks that it is not obvious what I am...  prev. page
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