Wayne,
A Hamstick close to a building such as a hotel with many conductors in
the construction is going to have issues with RFI.
You, not matter the SWR, are going to need some quarter wave
counterpoise wires, or radials, to tame the ham stick. You may also
need to remote the antenna from any fire alarm wiring and circuits.
These systems are notorius for causing RFI to phone systems, or other RF
circuits since many fire alarms use a carrier current type of daisy
chain circuit to poll the various sensors around the building. Try
operating with at least quarter wave insulated wire, even stretched
around the room, or hung out an upper floor window. Try reducing the
power, you don't really need 100 watts when the propagation is in.
Oh, and the good SWR? Well, a dummy load has an SWR of 1:1, but does
not contact many other stations. You may have been loading up the coax
shield as much as the short antenna. That would allow outside the
shield current to come back and cause typically the type of problem you
had with sensitive electronics.
GL and 73,
Stuart
K5KVH
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