[Lowfer] Makeshift lowFER receiving antenna
Bill Ashlock
ashlockw at hotmail.com
Mon Nov 2 19:30:02 EST 2009
Jay,
Yes, this clears up my confusion. Looks like there is SOME benefit to using the the CP666 over the J310
Thanks,
Bill
> From: jrusgrove at comcast.net
> To: lowfer at mailman.qth.net
> Date: Sun, 1 Nov 2009 22:11:58 -0500
> Subject: Re: [Lowfer] Makeshift lowFER receiving antenna
>
> 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, &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, &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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