Re: [IRCA] Intriguing DXing locations

[Mike Hawkins <michael.d.hawkins@xxxxxxxxx>]

Stockton is a few feet lower, there's only one and it usually smells bad.
Stockton is the only place I know of that makes Oakland look good.

Mike

On Tue, May 4, 2010 at 5:37 AM, Derek Vincent <eargazimm@xxxxxxx> 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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