Chokes - too expensive!

Seems like over the past year or so, chokes of coax-and-sleeve ferrite types have become popular items on offer from commercial outlets.  Typically, they cost upwards of £30.

Whilst a choke of this sort might look a little tidier, you can easily make your own air-wound version just by rolling a few coils of coax around a plastic pipe.  This both saves you money and reduces the extra losses introduced by additional connectors.

Type 31 ferrites for sale on Ebay.

If you really want a linear, rather than coiled choke like this, you can buy the ferrites off the likes of Ebay for about a quarter of the price of a ready-made, commercial offering.