[Lowfer] Ground wetness vs. impedance for ground dipole

[Warren]

Jay,
To answer your question I looked at some impedance data that I logged with 
my vector impedance digital wattmeter, the LP-100a. Measurement was made 
through the old 4:1 step down balun and about 100' RG-8x.
Dry conditions resonance (X=0) at 471kHz, R=26.7 ohms
Wet (after heavy rain) resonance 421kHz R=87 ohms

So substantial changes in both R&X

73 Warren
----- Original Message ----- 
From: <jrusgrove at comcast.net>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Thursday, June 02, 2016 9:17 AM
Subject: Re: [Lowfer] [600MRG] WH2XIL 137.7798 and 470 kHz


> Warren
>
> Interesting. Wonder what the impedance change is ... some R some X or all 
> R or all X.
>
> Jay
>
> ----- Original Message ----- 
> From: <k2ors at verizon.net>
> To: <lowfer at mailman.qth.net>
> Sent: Thursday, June 02, 2016 8:16 AM
> Subject: Re: [Lowfer] [600MRG] WH2XIL 137.7798 and 470 kHz
>
>
>> Jay,
>>    The reason I dropped the power down is that the OGD is sensitive to 
>> ground moisture, when the ground is really dry the antenna impedance 
>> drops and the Class-D transmitter will deliver more power, sometimes 
>> causing an over-current trip out. The difference from dry to wet 
>> conditions is greater than 3:1  in terms of power output.
>> The power drops as dew forms at night and the impedance rises. It drops 
>> by an almost 4:1 ratio after a heavy rain.
>>
>>
>> 73 Warren K2ORS
>> WD2XGJ
>> WD2XSH/23
>> WE2XEB/2
>> WE2XGR/1
>>
>>
>> On 06/02/16, k2ors at verizon.net wrote:
>>
>>
>>
>>
>> Hi Jay,
>>
>>
>> I am leaving it on, however I dropped the power down quite a bit this 
>> morning to about 36 Watts out since I am away until sometime this 
>> afternoon.
>>
>>
>> 73 Warren K2ORS
>> WD2XGJ
>> WD2XSH/23
>> WE2XEB/2
>> WE2XGR/1
>>
>>
>> On 06/02/16, jrusgrove at comcast.net wrote:
>>
>> Warren
>>
>> Tnx info.
>>
>> That's by far the loudest I've heard you're station transmitting on the 
>> OGD (on ground dipole). Will
>> it be on during the day today and again tonight?
>>
>> Jay
>>
>> ----- Original Message ----- 
>> From: "Warren K2ORS" <k2ors at verizon.net>
>> To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" 
>> <lowfer at mailman.qth.net>
>> Sent: Thursday, June 02, 2016 5:32 AM
>> Subject: Re: [Lowfer] [600MRG] WH2XIL 137.7798 and 470 kHz
>>
>>
>>> Jay,
>>> Ground dipole, aprox 80W. I did wind a new transformer for the dipole 
>>> using FT-240-77 8 turns
>>> primary, 12 turns secondary.
>>> Thanks for the advice and nice audio clip!
>>>
>>> 73 Warren
>>>
>>>
>>>
>>> On 6/1/2016 10:14 PM, jrusgrove at comcast.net wrote:
>>>> Warren
>>>>
>>>> Power, antenna on 470 kHz?
>>>>
>>>> Short .mp3 at http://www.w1vd.com/WH2XIL060116.mp3 .
>>>>
>>>> Jay W1VD WD2XNS WE2XGR/2
>>>>
>>>>
>>>>
>>>> ----- Original Message ----- From: "Warren" <k2ors at verizon.net>
>>>> To: "Discussion of the Lowfer (US, European, & UK) and MedFer 
>>>> bands"
>>>> <lowfer at mailman.qth.net>
>>>> Cc: <600mrg at w7ekb.com>
>>>> Sent: Wednesday, June 01, 2016 3:45 PM
>>>> Subject: [600MRG] WH2XIL 137.7798 and 470 kHz
>>>>
>>>>
>>>>> WH2XIL 137.7798 QRSS 60
>>>>> and
>>>>> 470 kHz CW
>>>>>
>>>>> Reports welcome!
>>>>> 73 Warren
>>>>>
>>>
>>>
>>> ---
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