Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 05 Dec 2010 13:13:33 -0600
Rhombics do radiate, but I don't think they are the ultimate in antenna compared to a stack of modern long boom yagis. At one time W6AM had a rosette of a dozen large rhombics taking up 25 acres of l
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 05 Dec 2010 18:29:16 -0600
I think the Beverage works on a bending of the radiation field very close to the ground which benefits receiving but is not an effect the antenna can create for transmitting. 73, Jerry, K0CQ On Sun,
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 05 Dec 2010 19:58:54 -0600
Its a receiving antenna. According to its paragraphs in the "Antenna Engineering Handbook" by Johnson and Jasik (not me), page 11-17, "Reception depends on the tilt of the arriving vertically polariz
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 06 Dec 2010 10:59:04 -0600
1 KW PEP input was the rule under which the 30S-1 was designed. The manual indicates 800 watts input on CW and 900 on SSB allowing 100 watts feed through power in the power input computation. In any
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 06 Dec 2010 13:02:31 -0600
Interesting point. I see newbies tuning just to the point they can copy and the audio sounds to be 200 or 300 Hz off frequency which doesn't improve copy and is far enough off tune with a transceiver
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 06 Dec 2010 17:03:08 -0600
Usually you get more punch as seen on the wattmeter and the receiver S-meter with strong lows. Sometimes you get better copy on a weak signal with a little enhancement of the highs for better articul
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 06 Dec 2010 23:47:56 -0600
Don't have one. The major search engines no longer admit such a part, not even from the Chinese repositories of ancient and obsolete parts. I do have a data sheet in this computer however, and it loo
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 07 Dec 2010 09:02:03 -0600
In my opinion the Corsair 9 MHz filter is exactly where it should be and there should always be that one IF stage after the balanced mixer to properly terminate the filter from LF to VHF for better i
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 07 Dec 2010 09:12:06 -0600
Any antenna for that matter looses 1/2 their power or more when operated on a band that it is not designed for. Why do you say that? I don't agree. It may not radiate in the direction it did on the f
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 07 Dec 2010 11:32:08 -0600
I have a data sheet for the Corsair counter. It would reproduce well in a modern micro, though it might take a bit of PC board to adapt a 100 pin surface mount chip to the original board. PIC comes t
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 07 Dec 2010 18:04:44 -0600
But then the transmitting antennas in the states might have been curtain arrays of dipoles with a mere 20 dB gain fed by 250 or 500 KW RF. 73, Jerry, K0CQ Sounds good, especially the rhombic. I visit
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 08 Dec 2010 23:41:08 -0600
That big size kept the 127 myriad dials, knobs, and buttons from overlapping or from manly finger tips hitting more than one at a time. 73, Jerry, K0CQ One thing a person could do before they get a l
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 09 Dec 2010 11:19:43 -0600
Art was more push than engineer. He had the money and the majority of the stock. When I worked there from 1963-'66, he ran the company with 20,000 employees as if it was still in his basement with fo
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 09 Dec 2010 11:24:07 -0600
As I sent to YSD yesterday: I've read quickly through the .doc. Its only considering nearby or near field for people exposure. Using NEC for that is wrong, uses the wrong math. And NEC does not model
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 09 Dec 2010 12:50:23 -0600
Art made stories. Art didn't take much to advice from others, and those who stayed on his payroll didn't give any. I suspect the number of ex Collins engineers is 5 or 6 times their largest work forc
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 09 Dec 2010 20:34:47 -0600
There are several, I read Radio Wizard just over a year ago while searching for information on ham radio in Story County/Ames Iowa before the present radio club began. It said he was in Ames at a sho
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 12 Dec 2010 18:58:07 -0600
a) it would really help to "clean up" and delete stuff before sending a reply. Otherwise, the same messages get repeated all over again and again and again, cluttering up the reflector. Definitely. b
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 13 Dec 2010 10:24:40 -0600
From Hamilton Hicks last May. I have an Airpax breaker model lELK1-1REC5-51-20.0-01-V. I assume the "20.0" is 20 amps. An accompanying Ten Tec sheet refers to it as a Model 1140 Airpax has made and m
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 14 Dec 2010 02:41:46 -0600
In my experience, no fuse or circuit breaker is as fast as a semiconductor so the blown fuse or tripped circuit breaker is often an indicator that the semiconductor has failed shorted. That being sai
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 14 Dec 2010 10:52:20 -0600
At Mouser (www.mouser.com) and Digi-Key (www.digikey.com) you can buy microprocessor crystals for less than 50 cents each. You just have to buy a bunch and do your own matching which can take having