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Re: [IRCA] Intriguing DXing locations
You didn't go downtown after dark, did you?
On Tue, May 4, 2010 at 2:00 PM, Donald K. Kaskey <kaskeyfamily@xxxxxxxxx>wrote:
> Let's not argue about this fellows. Those two great centers of California
> population are close enough that you can count them as one! Oddly, I've
> made several trips to Stockton in the last couple years and found the
> natives quite friendly & restaurants that serve a fine meal. Didn't see even
> one Pandoran the whole visit....
>
> Don K.
> S.F. CA
>
>
>
>
> Derek Vincent wrote:
>
>> Manteca the armpit??? No no. That would be Stockton : )
>>
>> Thank you.....
>>
>> Derek Vincent
>>
>> Vmedia360.......everywhere
>>
>> On May 4, 2010, at 4:16 AM, Mike Hawkins <michael.d.hawkins@xxxxxxxxx>
>> wrote:
>>
>> I am far from technical on the subject, but I can agree with the
>>> dampening
>>> effect. I went up to Don Kaskey's house a few times and we listened on
>>> car
>>> radio and on my Grundig at the beach in San Francisco. I drove the Great
>>> Highway south after leaving and had strong signals on several TP
>>> frequencies. When I turned inland, the signals dropped off dramatically.
>>> Many were gone by the time I was 3 miles inland, though the stronger ones
>>> lasted until I was 10 miles in, and the strongest continued on.
>>>
>>> One night in 1980/1981, I went out to an artichoke patch (I think...it
>>> was
>>> dark and rainy) north of Santa Cruz with Doug Nyholm (remember him?) and
>>> we
>>> strung out 1200-1300 foot of longwire on stakes attached to his Yaesu.
>>> We
>>> had reasonable audio on 30-35 TPs from Australia/New Zealand/Fiji. I had
>>> never heard most of them before or after that night.
>>>
>>> There have been some good exceptions to the rule though...I used to pull
>>> in
>>> a AM station from Malaysia with some regularity when I lived in Manteca
>>> CA,
>>> which is politely referred to as the armpit of California. I also had
>>> armchair quality on a Central Chinese station on 1525 kHz way back when.
>>>
>>> Mike Hawkins
>>>
>>>
>>> On Mon, May 3, 2010 at 10:46 PM, Nick Hall-Patch <nhp@xxxxxxxx> wrote:
>>>
>>> At 23:04 5/3/2010, you wrote:
>>>>
>>>>> Those would indeed be great, and away from all forms of RF noise.
>>>>>
>>>>> I was also wondering how close they were to the ocean; my understanding
>>>>> is
>>>>> that going even a few hundred yards or so inland puts a significant
>>>>> damper
>>>>> on TA/TP signals - can any TA/TP veterans confirm/correct this?
>>>>>
>>>> Hi Kevin,
>>>>
>>>> I suspect that the amount of loss is somewhat dependent on the ground
>>>> conductivity of the inshore land, the frequency of the signal, and the
>>>> arrival angle of the signals, but only really have data for the second
>>>> of
>>>> those suppositions. The others are based on the supposition that a low
>>>> arrival angle signal from over the ocean will lose strength more slowly
>>>> over
>>>> highly conductive land (salt marsh) compared with poorly conductive land
>>>> (rock) the further it travels. A high arrival angle signal, on the
>>>> other
>>>> hand, presumably will not be as affected by ground conductivity so one
>>>> might
>>>> assume it will be nearly as strong inland as at the shore.
>>>>
>>>> As for the second supposition, a few years ago, John Bryant and I did
>>>> some
>>>> simultaneous signal strength recordings at the shore and points up to
>>>> around
>>>> two kilometers inland at Grayland, and found that the loss was highest
>>>> for
>>>> higher frequency signals, and varied from 1 to 12 dB depending on how
>>>> far
>>>> inland one was (but signals were almost always best right at the beach).
>>>> It didn't seem to be a linear decay, rather there seemed to be
>>>> reinforcements and cancellations of signals at different points, so one
>>>> might luck out and hit a "pretty good" spot further inland, so one
>>>> shouldn't
>>>> out of hand reject a site a little ways inland. Randy Seaver wrote a
>>>> good
>>>> article years ago about this, entitled "Sea Gain" which is IRCA reprint
>>>> T062, and some of our results did seem to have some theoretical
>>>> underpinnings (Randy had found some academic work on the subject).
>>>> Unfortunately, both John and I were pretty busy at the time, and never
>>>> really finalized any conclusions on the subje!
>>>> ct...."more study is needed" (I'm sure Mike of the Grayland motel would
>>>> be OK with several weeks of rental from DX researchers.....).
>>>>
>>>> best wishes,
>>>>
>>>> Nick
>>>>
>>>>
>>>>
>>>>
>>>> *****************************
>>>> Nick Hall-Patch
>>>> Victoria, BC
>>>> Canada
>>>>
>>>>
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