[Lowfer] Makeshift lowFER receiving antenna

[jrusgrove at comcast.net]

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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