[Yaesu] Amplifier interfacing: Addendum, ---keying protection.

[KC3VO at aol.com]

I forgot to mention it in my previous post, but it is a very good idea to  
install a silicon diode, such as a # 1N4007,  across the keying lead  of D.C. 
keyed amplifiers such as the SB-200 / SB-220 series. This diode should  be 
connected in the polarity that does NOT cause the diode to key the linear  amp.  
The diode will limit the reverse voltage spike that is generated upon  un-keying 
the amplifier.  (I did add this diode to my SB-220 and SB-230)  73, KC3VO-Bob 
Curry.