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From: Roger Lapthorn <rogerlapthorn@gmail.com>
In-Reply-To: <4DBDB8F8.8060304@telus.net>
Message-Id: <E5A8A3DF-7A9B-47E1-AC63-987F156F6787@gmail.com>
Date: Sun, 1 May 2011 21:03:06 +0100
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
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Subject: Re: LF: Continued VE7TIL LF grabber outage...
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Hi Scott

I'm wondering how far up/down the coast a signal can be detected with a si=
milar electrode probe pair (one in the water and one on land)? Alternative=
ly looking for the signal along the shoreline with a horizontal loop or E-=
field probe? Could be an interesting test.=20

73s
Roger G3XBM

Via my 2.4GHz handheld (iPod Touch 4g)

On 1 May 2011, at 20:48, Scott Tilley <sthed475@telus.net> wrote:

> Hi Roger
>=20
> The closest electrode to the ocean is feeding into a creek that itself=
 feeds into the ocean.  This electrode is <75m from the salt water.  The=
 other electrode is about 0.5km inland at my house.
>=20
> Within about 2-3km of the setup I can run PSK250 with good SNR and near=
 perfect copy with on about 30W feed into the antenna.  Once outside this=
 range things degrade rapidly...
>=20
> Placing an electrode into the salt water won't last too long with the be=
achcombers, dogs and electrofobes passing by etc.
>=20
> 73 Scott
>=20
>=20
> On 5/1/2011 10:47 AM, Roger Lapthorn wrote:
>> Scott
>>=20
>> How close to the ocean are the electrodes in the earth mode tests? Can=
 you try with one in the ocean and one some way inland?
>>=20
>> 73s
>> Roger G3XBM
>>=20
>> Via my 2.4GHz handheld (iPod Touch 4g)
>>=20
>> On 1 May 2011, at 18:38, Scott Tilley<sthed475@telus.net>  wrote:
>>=20
>>> Hi All
>>>=20
>>> The VE7TIL 2200m grabber will remain off for another week or so.  This=
 is do to a hardware failure in a wide band amplifier in the the DDS syste=
m.  I'm waiting for some replacement parts as my efforts to make repairs=
 with parts on hand were less than satisfactory.
>>>=20
>>> I apologize for any inconvenience this may have caused users.
>>>=20
>>> However, by the grabber returns to operation it will be augmented by=
 a new VLF grabber page.  I just finished installing the loop in the garde=
n and it is working wonderfully.  I spent the evening last night listening=
 to tweeks/atmospherics and comparing my results on the VLF transmissions=
 with that of Laurence KL7UK in AK...
>>>=20
>>> Work on preparing a 8970 test transmission into my LF loop continues=
 and I expect to have the time to perform QRP tests later in May.  Earth=
 mode testing continues and so far best DX has been about 10km.    Interes=
tingly, the best path seems to be along the shore of ocean here.  Inland=
 propagation over the poor rocky ground here does not penetrate very far.
>>>=20
>>> 73 Scott
>>> VE7TIL
>>>=20
>>>=20
>>>=20
>>=20
>=20
>=20