[ARC5] 18S-4 Now and Later - Clarification

[Mike Morrow]

I wrote:

> The 18S-4 and the 18S-4A are identical except for the Collins 455 kHz mechanical
> filter used on the output of the receiver mixer into the IF chain.

I should have finished this sentence as "...the IF chain of the 18S-4A".

Mike / KK5F