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Noisy Low band generated from PoE of 1269 10 x antenna switch

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iz8eyp:
Hello Everyone,
After installation of Remote Antenna Switch 1269 that is powered thought PoE at 48 Volts I noted that some noise appear on 160/80m but notable even on high bands as 10m.

Does Anyone had the some problem ? In case how you fixed.

I tried to insert in between a EMC filter but doesn't work. The only thing I haven't try is to use an external injector and use a linear 48 Volts DC PS.

I attached herein a pic of peaks to let you see.

NA6O:
If you can power it from a clean linear supply, that may completely solve your problem. In any case, a proper common-mode choke on the ethernet cable is mandatory. Use a 2.4 inch mix 31 toroid, Fair-Rite 2631803802. 14 turns neatly wound in a single layer. Place this right next to the POE injector. Expect at least 20 dB of noise reduction. A second one on the dc cable from the switching supply would further  improve the noise reduction.

For complete information, see http://k9yc.com/RFI-Ham.pdf

Gary, NA6O

SM4KYN:
Hi,

Have you tried to put ethernet interface into 10MBit instead of auto.
I had the same problem on WEB-switch 1216H.

/Anders

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