Add upward pointing non-metallic pins along the top half of the loop.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 6/7/20 7:15 AM, Andy Durbin wrote:
I use a home brew mag loop on 30 m band and work into Asia most mornings with it.
The loop tunes to a near perfect match (1.00:1 SWR) but becomes instantly detuned
when a dove perches on top of it. SWR jumps instantly to > 3.0:1 and trips my
High SWR monitor. The birds look stupid but they are smart enough not to
straddle the loop opening. I imagine full loop voltage between their legs would
de-tune them a bit but they just perch one side or the other.
Damn dove nearly cost me a QSO with JD1 this morning and that was new DX for 30
m. I tail ended with FT8, he came back, I started to send my report, High SWR
trip, run to back door to chase the dove away, and got back before JD1 had
given up on me.
So how to keep birds of a mag loop without lowing the Q?
73,
Andy k3wyc
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