[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [IRCA] Intriguing DXing locations
That was in reference to the "armpit" topic. After hitting the send button,
I was thinking that nobody knew what I was thinking AND its probably best to
let my commentary on Stockton stop there before it hits the gutter.
Mike
On Tue, May 4, 2010 at 1:39 PM, Mike Hawkins <michael.d.hawkins@xxxxxxxxx>wrote:
> 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
>>>>
>>>>
>>>> _______________________________________________
>>>> IRCA mailing list
>>>> IRCA@xxxxxxxxxxxxxxxx
>>>> http://montreal.kotalampi.com/mailman/listinfo/irca
>>>>
>>>> Opinions expressed in messages on this mailing list are those of the
>>>> original contributors and do not necessarily reflect the opinion of the
>>>> IRCA, its editors, publishing staff, or officers
>>>>
>>>> For more information: http://www.ircaonline.org
>>>>
>>>> To Post a message: irca@xxxxxxxxxxxxxxxx
>>>>
>>>>
>>>> _______________________________________________
>>> IRCA mailing list
>>> IRCA@xxxxxxxxxxxxxxxx
>>> http://montreal.kotalampi.com/mailman/listinfo/irca
>>>
>>> Opinions expressed in messages on this mailing list are those of the
>>> original contributors and do not necessarily reflect the opinion of the
>>> IRCA, its editors, publishing staff, or officers
>>>
>>> For more information: http://www.ircaonline.org
>>>
>>> To Post a message: irca@xxxxxxxxxxxxxxxx
>>>
>>> _______________________________________________
>> IRCA mailing list
>> IRCA@xxxxxxxxxxxxxxxx
>> http://montreal.kotalampi.com/mailman/listinfo/irca
>>
>> Opinions expressed in messages on this mailing list are those of the
>> original contributors and do not necessarily reflect the opinion of the
>> IRCA, its editors, publishing staff, or officers
>>
>> For more information: http://www.ircaonline.org
>>
>> To Post a message: irca@xxxxxxxxxxxxxxxx
>>
>>
>
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca
Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
For more information: http://www.ircaonline.org
To Post a message: irca@xxxxxxxxxxxxxxxx