[HBR] Relay switched coils?

[Bill Cromwell]

Hi Walt,

For relay switching there are also issues of oxidation on the relay
contacts. The oxidation, even minor oxidation, degrades the performance.
A solution for that is to apply a voltage across the contacts and the
current will clean the contacts. Reed style relays will have contact to
contact "scrubbing" and that abrasion will scrub the oxidation off
without resorting to the extra trouble of the aforementioned
voltage/current.

I'm a fan of plug-in coils for their simplicity, reliability, and
uncompromised performance. For miniaturizing radios, even toroidal form
factors on high Q cores can be plug-ins. With plug-ins we have to be
careful to not lose them during field operation. Of course, the plugging
action cleans the contacts.

73,

Bill