[Lowfer] Makeshift lowFER receiving antenna

[Bill Ashlock]

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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