On 8/2/2014 10:28 AM, George wrote:
What Pacemakers do best with most amps?
I know nothing about Pacemakers or their RF susceptibility, but I do
know a bit about RFI. As far as I know, there are two issues. One is the
leakage magnetic flux from the power transformer. The other is radiated
RF. Unless the amp is a poorly shielded POS, all the RF gets radiated by
your antennas, with some possible leakage from el-cheapo coax and
connectors, and connectors poorly installed.
So the key issues are:
1) locate the power supply as far from where you will operate as
possible. This may mean using a different power amp.
2) eliminate the use of any antennas that put a lot of RF in your shack.
This generally means use only well-behaved beams and dipoles fed with
coax, again as far from the shack as practical.
3) go through EVERYTHING in the RF path between your power amp and your
antennas and make sure that it is well shielded, all the coax has a
beefy copper braid shield, that all connectors are first quality
Amphenols, all are properly installed, and there are no el-cheapo junk
connectors, barrels, adapters, etc. in line.
4) study the construction of your power amp to verify that it is,
indeed, well shielded. Are all cables either shielded or properly
bypassed? Do shields go directly to the chassis where they enter the
amp? (They must for shielding to work).
5) Find out from the manufacturer of the pacemaker the specific range of
frequencies to which it has sensitivity.
73, Jim K9YC
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