> After returning from a rather long hiatus from ham radio, I discovered an
> obscene amount of interference on the ham bands. I later learned that it
> was largely the result of 6 Ethernet'ed computers in the house with cat 5
> wiring running all over, and 3 runs going through the ham shack.
In addition to what has been written already (make note of comments on
noisy wall warts and other power supplies!), I should note that classic
10 Mbit ethernet uses 5 MHz machester encoding.
This means that one only sees spikes every 5 Mhz (with sidebands, alas).
100BASE-TX, because of it's encoding, is a lot wider and hence a lot
noisier.
If you don't need 100 Mbit speed to talk to that 2 Mbit ADSL modem,
then you may want to consider setting up a 10 mbit network.
Does the trick every time in ad-hoc setups like with JOTA.
Don't throw out the 'old' 10 mbit hubs, and when you do,
give them to a fellow ham fore safe-keeping.
73,
Geert Jan PE1HZG
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