Greetings

conducted by: Richard L. Measures, AG6K - telephone, [805] 386-3734 (voice). To penetrate the telemarketer filter, ring twice, hang up, press "Redial". If I am home, I will answer. If not, please leave your telephone # and I will return the call.

6455 La Cumbre Road, Somis, CA, 93066 / E-mail:

2@mail.vcnet.com

2@vc.net

last revised 8 September, 2002.

What's new and semi-new?:



Articles

High Potential Tester (a.k.a. 'high-pot.')
Circuit Improvements and Maintenance Procedures for the TS-830S
Circuit Improvements for the TS-430S
Circuit Improvements for the TS-440S
Circuit Improvements for the TL-922 [condensed version]
QSK for the TL-922 and SB-220 With Circuit Improvements for the TL-922

"Circuit Improvements for the Heath SB-220 Amplifier" (updated manuscript for Nov.-Dec., 1990 QST article).

Three articles on Basic Electricity originally written for Home Power Magazine®. Home Power Issue #3, Issue #4, Issue #5..

 

Fyler, G. W. ''Parasites in Transmitters'', Institute of Radio Engineers journal. Sept. 1935. Conclusions.


Original Manuscripts, updated where appropriate

"Improved Anode Parasitic suppression for Modern Amplifier Tubes", {October 1988 QST,}

"Adding 160 Meters to HF Amplifiers" {1/89 QST}

"A Balanced Balanced Antenna Tuner" {2/90 QST}

"Circuit Improvements for the Heath SB-220 Amplifier" (updated manuscript for Nov.-Dec., 1990 QST article).

"The Nearly Perfect Amplifier" (1/94 QST)


Dovetron's 10m mod for the TL-922, page 1, and page 2.
What follows is the updated manuscript I wrote under contract for the amplifier chapter (13) of the 1995 ARRL Handbook

"Amplifiers"

If you find a glitch in Amplifiers, a fuzzy explanation, a technical error, or a typo, please let me know. If you think I left something important out, please say so.

The title 'Amplifiers' is somewhat misleading. Only linear amplifiers are discussed in detail. If you are interested in building a Class B or Class C amplifier, 'Amplifiers' is not going to be of much help.


---------------We Sell------------------

Low VHF-Q parasitic suppressor retrofit-kits for most types of amplifiers -- both mfg. and home-brew. Price List--Information Sheet

High-speed switching parts-kit for retrofitting an existing non-QSK amplifier. p/n 47 (See January, 1994 QST , "The Nearly Perfect Amplifier", page 33---or see Figure 7 - 7B above) The kit includes the Matsushita 1mS RF reed-relay (RY2), the NEC optoisolator (Q2), the 6A transistor (Q1), two (1 plus a spare) 1500w 51v transient voltage suppressors (D1), needed resistors/capacitors and a 300v 0.5a NPN switch transistor for controlling the amplifier with a radio that supplies +LV on TX to key the amplifier. Untested, used, Jennings RJ-1A RF output vacuum-relays (RY1) are available from Fair Radio Sales 419-227-6573. The price is approximately $35 for a used RJ-1A. . // The price of the parts kit is $21 plus $1 for shipping to US addresses .// . I recommend testing the RJ-1A before use. A relay with a good vacuum will withstand at least 3500v across the open contacts -- with under 2 micro amperes of leakage. Note: A bad vacuum in RY1 can destroy RY2.. High Speed Relay Mounting Instructions.

High-reliability, high-stability MOF resistors for electrolytic filter capacitor equalizer R service. Matsushita, 100k-ohm, 3w, 500V max. matched within 0.05%, part number 86, $0.48 each.

We no longer sell telephone RFI filters. However, you can buy the parts for them from Mouser Electronics [1-800-346-6873]. The part number for the 470 micro-Henry inductor is 43LS474. The current price for 100 is $29. 100 inductors will build 50 single-section filters or 25 double-section filters. The value of the [1000pF to 3000pF] capacitors is extremely non-critical. The capacitors have little effect on the suppression ability of the filters--except perhaps on 10m. Put one inductor in series with each side of the telephone line. The filter should be close to the telephone. If the interference persists after one filter is installed, try a double-section filter. Phone filter
Diagram.......phone filter Instructions.

We no longer sell HV bypass caps because our cap supplier stopped carrying them.


League Fatigue

- The Background Story behind the following story-

On page 24 in the February, 1996 issue of QST, Editor Mark Wilson, AA2Z, writes:

"The rebuttal that Rich provided was, in our view, repetitious of his articles that were previously published in QST. Readers who are interested in knowing more about his design philosophy have a wealth of material in print with which to work."

Maybe the Rebuttal is repetitious of the QST articles, or perhaps not. I thought that the people who read QST might like to have the opportunity to decide this matter for themselves. After all, Mark Wilson works for them. It's probably a good idea for an employer to check up occasionally on employees.

Mark Wilson said, "We should have sent 'The Nearly Perfect Amplifier' for technical review and dealt with any questions about its accuracy prior to publication, ...." Apparently, Mark expects people to believe that QST does not perform an adequate technical review of articles with its own technical review group. Unsliced bologna. No article gets accepted without the approval of QST's technical review group. Mark seems to have forgotten that "The Nearly Perfect Amplifier" did receive a final technical review just before it went to the printer. The final reviewer was QST's present Editor, Mark Wilson.

Mark Wilson suggests that there were some technical errors in the article -- but he doesn't mention a specific error to support his allegation. So far, I have become aware of one technical error in the article. Eimac recommends a Q of 5, Not a Q of 2, for the tuned input of a G-G amplifier. The person who found the error was the author of the article. If you find another technical error in the article, please telephone me, collect if you like, or E-mail me.

I apologize for the length of the Rebuttal. It is longer than I would have liked. However, the Rebuttal is designed to address each point of contention in the September. 1994 QST [pages 71-74] critique. There was much material to cover. The critique by the six "contributors"/critics (Fred Telewski, WA7TZY; Tom Rauch,W8JI; Reid Brandon,W6MTF; Bill Clemow, KE7CX; John Fakan, KB8MU; and Steven Katz, WB2WIK) amounted to 5500 words -- an all-time record for QST.

A
letter from Eimac® (text) is mentioned in the Rebuttal. Letter from Eimac® (photocopy)


link to 'The Somis Library' (not related to amateur radio)

photos of Plywood Box; Top, Front , Chassis , Power Supply

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