[Lowfer] Makeshift lowFER receiving antenna

[jrusgrove at comcast.net]

Bill

The "Amrad article" numbers are the figures reported in the original article. The "W1VD built" are 
the numbers for the unit I built and measured using the CP666 (actually built three of them). "J310 
12 volt" is for the same unit where the CP666 was replaced with a J310 and run at 12 VDC. "J310 24 
volt" is for the same unit run on 24 VDC.

Hope this helps clear up any confusion.

Jay

p.s. I'm anxiously waiting for the return of Wm and/or wM or at the watering hole...


----- Original Message ----- 
From: "Bill Ashlock" <ashlockw at hotmail.com>
To: <lowfer at mailman.qth.net>
Sent: Sunday, November 01, 2009 9:55 PM
Subject: Re: [Lowfer] Makeshift lowFER receiving antenna


>
> Jay,
>
> Looks like the data set (below) was measured from different probes. Could you clarify which ones 
> they were?
>
> Bill
>
>> From: jrusgrove at comcast.net
>> To: lowfer at mailman.qth.net
>> Date: Sun, 1 Nov 2009 05:39:30 -0500
>> Subject: Re: [Lowfer] Makeshift lowFER receiving antenna
>>
>> Lee
>>
>> A J310 FET can be substituted for the CP666 with good results. Here's some measurements from a 
>> few
>> years back. In all, I've probably built a dozen of the Amrad E probes...three with the CP666 and 
>> the
>> rest using J310
>>
>>                       Amrad article         W1VD built           J310 12volt        J310 24 volt
>>
>>
>> 1 dB comp.    +25 dBm                +25 dBm            +17 dBm            +18 dBm
>>
>> IP2                +53 dBm*              +60 dBm                +50 dBm         +60 dBm
>>
>> IP3                +37 dBm                +36 dBm               +32 dBm         +32 dBm
>>
>>
>> * possible measurement error
>>
>> Jay W1VD  WD2XNS  WE2XGR/2
>>
>> ----- Original Message ----- 
>> From: "LEE BAHR" <pulsarxp at embarqmail.com>
>> To: "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands" <lowfer at mailman.qth.net>
>> Sent: Saturday, October 31, 2009 10:35 PM
>> Subject: Re: [Lowfer] Makeshift lowFER receiving antenna
>>
>>
>> > Charlie:
>> >
>> > I didn't see the e-probe antenna.  Can you tell me where to find it?  I did
>> > a search and found an article in Sept, 2001 called The AMRAD Active LF
>> > Antenna.  Is this any good.  I was thinking of building it.  Maybe your
>> > e-probe job is better.  Andy, KU4XR has been giving me some tips too.
>> >
>> > I tuned my reciever down to the LF range using just a long wire.  the noise
>> > is terrible.  It would be hard to hear much this way.  I even need to use
>> > the noise blanker as pulse noise is terrible too.  This long wire is just my
>> > 80/40 meter antenna with the coax ground taken off the radio.  I am sure it
>> > is not tuned and I'm picking up noise everywhere this way.
>> >
>> > The AMRAD antenna looked good to me and I found FAR Circuits has the two
>> > boards, the transformer is easily available (Power) and the CP 666
>> > transistor is available fromCrystalonics for a little over $17.00.
>> > Everything else is generic and all parts seem obtainable today.  Right now I
>> > don't want to take the time building a box loop.  I'm building a house on
>> > lake Livingston and until i move there a probe antenna would be easier for
>> > me to handle right now.
>> >
>> > Lee, w0vt
>> >
>> >
>> > ----- Original Message ----- 
>> > From: "Charlie , W5COV" <cvest at cox.net>
>> > To: "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands"
>> > <lowfer at mailman.qth.net>
>> > Sent: Saturday, October 31, 2009 9:51 PM
>> > Subject: Re: [Lowfer] Makeshift lowFER receiving antenna
>> >
>> >
>> >> Lee , if you are a builder , the e-probe mentioned on here earlier is easy
>> >> to build , works extremely well , and is very small in size . Makes a nice
>> >> compact omni directional antenna .
>> >>
>> >> Charlie , W5COV
>> >>
>> >> CV, 185.29825kHz. ,QRSS60 , 24 / 7 , EM26ex , OK.
>> >>
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