[Lowfer] New to the list. A few questions re: Lowfers and longwave

Wed, 9 Apr 2003 13:35:29 -0400

LF Engineering is still in business. A Local bought an E-Probe a few months
back.

Mike
wa1ptc

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of [email protected]
> Sent: Wednesday, April 09, 2003 1:03 PM
> To: [email protected]
> Subject: Re: [Lowfer] New to the list. A few questions re: Lowfers and
> longwave
>
>
>
>
> > Commercial LF preamps may be available from companies like LF
> > Engineering,
> > Palomar and Datong. Someone else may be able to offer advice on
> > which unit
> > would be best -- I haven't ever used a commercial preamp because
> > they are so
> > easy and cheap to build. As Gary, WA6DTX points out, a major concern
> > is
> > overload by strong local broadcast stations. I would expect KSTP to
> > be even
> > more of a problem than WCCO in the Arden Hills area. An essential
> > feature of
> > a preamp will be a good low-pass filter in the front end.
> >
>
> I have the ckt for the LF eng. preamp. uses an Opamp .
> is a LF 357 and works well. I used the same chip but replaced the
> input with an Audio transformer for better pref. at ELF. Is simple to
> repo
> and doesnt need to be tuned and if anyone wants a copy I can supply a JPG
> is LF Eng. still in business  ?? The info probably shouldnt be posted on
> a site
>
> Oh the chip is by National Semiconductor
>
>
> Bob  K3DJC
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