I'm sorry. I didn't intend to be morbid. My point was that, to be
safe, the person with a pacemaker should check with the manufacturer
of his device as well as with his doctor.
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Reminder: The February Second Sunday Sprint is a little more than a
On 1/30/20 10:00 AM, Jim Sheldon wrote:
Morbidly funny John, but really, a good point. Some info on
at least one brand of pacemaker (the one I have).
I too have a pacemaker. I often run 500 watts and one end of
the 160-80-40 meter antenna runs right over the shack, about 3
feet above the house roof. My pacemaker is from "Boston
Scientific", has bluetooth connectivity to a remote monitor that
lets my cardiologist know immediately if something goes wrong
with either ME or the pacemaker. I'm on the air almost daily
for at least one QRO contact on 40 meters and in over 12 years,
have had no RF episodes with the pacemaker.
My Boston Scientific rep said the main thing to avoid is high
magnetic fields as a coded magnetic signal is used to trigger
diagnostic mode in their pacemakers so a Mag Loop might be a
different ball game entirely. I don't have one here but then I
have a 40' telescoping vertical that collapses down to 3 feet
for my portable operations when I even go portable anymore -
That being said, I agree with the need to use CAUTION when
operating close to radiated fields of any kind when one has a
pacemaker implant as I'm sure the manufacturers all use
different RF and Magnetic exposure standards from each other and
results will surely vary. Best to err on the side of safety.
------ Original Message ------
Sent: 1/30/2020 9:42:39 AM
Subject: Re: [4SQRP] HF Magnetic Loop and Pacemaker
Start with 1 Watt, then go with 2
Watts, etc. If you die, back down a Watt (hi).
On 1/30/20 9:24 AM, John - KK4ITX
via Groups.Io wrote:
I use the MFJ-9232 QRP Pocket Loop tuner and
find it a useful setup to eliminate the local noise.
There are several YouTube videos showing good results but
beware...... they were made when there were sun spots. I
had great fun rigging up the expansion arrangement to
allow for various lengths of wire. To get a broader
bandwidth I used trailer hookup wire, seems to work better
than the wire that came with it.
The supports are driveway markers and I
really lucked out at a Flea Market with the $4.00 heavy
duty tri-pod. I have attached a picture of the assembled
unit if anyone is interested I have more and some
additional hints and details to offer.
As for use with a pacemaker ? You will know
if it is bothering you or anyone else I believe. When I
tune up I am listening (RX) or using my Sark 100 so
there’s no large amount of RF present....... Operating
(TX) one would be several feet away so at 5w I doubt that
you would be affected but just go at it slow (1-2w) and
see what happens.
On Jan 29, 2020, at 22:18, Dan Reynolds <on30ng@...
I have access to some hardline and I'm
thinking about making a transmitting loop. I know
there was a design out there that used an Arudino to
tune the loop at frequency changes...
Anybody have some decent designs - I do not want to
design it myself. I'm not too proud to borrow someone
Also, does anyone know about any problems with a
transmitting mag loop and a pacemaker (QRP levels
Dan Reynolds -- KB9JLO