[Lowfer] My Active Loop is apparently dead

[jrusgrove at comcast.net]

Andy

Measuring 12 VDC at the end of an open circuited cable doesn't tell you what it's doing under load. IIRC that 0 input impedance preamplifier of the Wellbrook loop drew a fair amount of current. Might be worth further investigation before giving up on it.

Jay W1VD


----- Original Message -----
From: Douglas Williams <williamsdoug1966 at gmail.com>
Reply-To: Discussion of the Lowfer (US, European, & UK) and MedFer bands <lowfer at mailman.qth.net>
To: Discussion of the Lowfer (US, European, & UK) and MedFer bands <lowfer at mailman.qth.net>
Sent: 11/21/2019 5:14:24 PM
Subject: Re: [Lowfer] My Active Loop is apparently dead
________________________________________________________________________________

Andy,

Unfortunately, if I recall correctly, the Wellbrook loop preamp is not user
serviceable. If you have 12 volts at the end of the coax at the base of the
loop, and you aren't hearing signals, one must conclude, as you did, that
the issue is in the active preamp. IIRC, it is potted. :-(

I think MFJ sells a similar active receiving loop, probably with a user
serviceable preamp?

D. KB4OER



On Wed, Nov 20, 2019 at 8:35 PM Andy - KU4XR via Lowfer <
lowfer at mailman.qth.net> wrote:

> Hi all:
>
> Thanks for the replies about the loops proximity to my TX antenna. I
> appreciate that. I got the loop about
> 2 years ago - used - and it has sat in my garage till today. When I appled
> power - DEAD - Performed all the
> fault checks, and have 12 volts DC with correct polarity on the BNC at the
> loop. Can only conclude that the
> Active Electronics in the box at the loop are dead.
>
> 73 all, and good DX:
>
> Andy - KU4XR
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