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Re: [TowerTalk] OT but relevant

Subject: Re: [TowerTalk] OT but relevant
From: Jim Brown <>
Date: Thu, 25 Feb 2016 10:16:52 -0800
List-post: <">>
On Thu,2/25/2016 10:03 AM, Mark Pride via TowerTalk wrote:
Results:  Amazing.  No issue at all.  Imagine running 1500 watts on 4 bands 
simultaneously and where there was a directional antenna used, the antenna was 
pointed at the house.

No surprise at all. First, pacemakers are a mature technology, and there are many potential RFI sources in the public environment, not the least of which are cell phones, often in very close proximity to the pacemaker.

Second, RF is coupled by ANTENNA action, and by MAGNETIC coupling. The pacemaker is, no doubt, designed to minimize both coupling mechanisms, both of which increase with frequency. If they ill reject a GHz cell phone a few inches away, they will certainly reject a kW HF rig 100 ft away.

Let the pacemaker mfr tell you, but the sources I would be concerned about are poorly designed or defective devices like microwave ovens, variable speed motor drives, or other devices that create strong fields in the UHF range.

73, Jim K9YC

73, Jim K9YC

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