[600MRG] And now for something lighter!

[Edward R Cole]

On Nov. 11 this year I will celebrate 60-years as a ham <what old geezer?>
I remember drooling over a HRO-60 in 1959.  <not mine>
  73, Ed

At 12:28 PM 3/16/2018, kl7aj at acsalaska.net wrote:
>There are enough old geezers on this list who will appreciate this story. :)
>
>73,
>
>Eric
>
>   ---
>Eric P. Nichols, KL7AJ
>AlasKit Educational and Scientific Resources
>3763 Lyle Avenue
>North Pole, AK 99705
>(907) 488-0483
>(907) 371-7120
>http://alaskit.co
>
>On Fri, 16 Mar 2018 12:20:47 -0800, Edward R Cole wrote:
>
>I found that I had to add two turns on my loading coil in winter as 
>frozen soil had lower conductivity. I attached leads to the two tap 
>locations so I t only required moving my short antenna leader to the 
>proper tap wire that uses a 1/4-20 brass stud. I use about three 
>foot of RG-213 center conductor as leader (shield un connected 
>either end). My antenna is back in the air and only awaiting 
>retuning from 495 to 473 KHz.
>
>73, Ed - KL7uW
>
>At 09:33 AM 3/16/2018, kl7aj at acsalaska.net wrote:
>
>>By the way, don't ignore the REACTIVE component of the impedance! 
>>Ground conductivity is a COMPLEX number, containing both a 
>>resistive AND a capacitive (dielectric constant) component, the 
>>latter of which can affect reactance significantly. The reason for 
>>this is the REFLECTED signal (ground image) signal has a virtual 
>>depth dependent on the dielectric constant. A change in this has 
>>the same effect as changing your antenna height....which, of 
>>course, reflects in BOTH reactance and feedpoint resistance. 
>>EVERYTHING interacts with everything else. This is why RF is so much fun. :)
>>---
>>Eric P. Nichols, KL7AJ
>>AlasKit Educational and Scientific Resources
>>3763 Lyle Avenue
>>North Pole, AK 99705
>>(907) 488-0483
>>(907) 371-7120
>>http://alaskit.co
>>
>>On Fri, 16 Mar 2018 15:54:23 +0000, Neil Klagge wrote:
>>
>>Tnx Ben. That was quite revealing. I did not know it could have 
>>that much of an effect.
>>
>>Neil, w0yse
>>
>>Sent from Neil's iPad....
>>----------
>>From: 600mrg-bounces at mailman.qth.net 
>><600mrg-bounces at mailman.qth.net> on behalf of Ben Gelb <ben at gelbnet.com>
>>Sent: Friday, March 16, 2018 7:58:33 AM
>>To: Posting 600m 600mrg
>>Subject: [600MRG] Rain amplitude modulation
>>
>>We've been getting some rain in the SF Bay Area finally, which has 
>>presented a fun opportunity to observe fluctuations in ground 
>>losses during rain events. Below are some plots from last night of 
>>the R component of my antenna impedance (captured while WSPRing) as 
>>well as some precipitation data from a local weather station.
>>
>>I retuned the antenna a few weeks back to present right around 50 
>>ohms to the TX. Last night it ranged from about 35 ohms to 48 ohms 
>>(or really 140 to 192 ohms before the transformer). Rr is estimated 
>>at about 0.2 ohms, so that variation is really all variation in 
>>ground loss (and I guess a pretty large corresponding change in 
>>antenna efficiency).
>>
>>Maybe a really clever WSPR listener could estimate the rate of 
>>rainfall at my QTH based on changes in signal strength... hi.
>>
>>Hopefully the plot images come through... or everyone is going to 
>>wonder what I'm talking about!
>>
>>My measured feedpoint resistance (stepped down from loading coil by 
>>4:1 ratio).
>>
>>[]
>>
>>
>>
>>Rainfall data from the Weather Underground station in my 
>>neighborhood (wraps at 12 midnight, so you have to use your 
>>imagination to fix the line, but there's a big step from the 
>>downpour around midnight):
>>[]
>>
>>
>>73,
>>Ben N1VF
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>
>73, Ed - KL7UW
>http://www.kl7uw.com
>Dubus-NA Business mail:
>dubususa at gmail.com
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73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com 
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