[Elecraft] Common Mode chokes to reduce noise

[Dave]

While it is unlikely to make any difference, if you can source these
ferrite sleeves in the USA they are excellent value and perhaps worth a
try. A pack of 5 cost about $1.50 plus shipping and tax (£1.15 + tax in the
UK). Two packs (10 sleeves) should make an effective choke for 6m and will
slip over RG213 size coax.

My own measurements of them with a VNA look OK with 10 used on 6m and 4m, 5
are suitable for 2m.

https://cpc.farnell.com/unbranded/559-568/emi-sleeves-10-7-x-28-5mm/dp/CBBR6937?ost=559-568

73 Dave G4AON
-- 
Sent from my iPhone SE