[AMRadio] Relay K5 in BC-1T

sbjohnston at aol.com sbjohnston at aol.com
Sun May 13 22:55:03 EDT 2007

K5 in my Gates BC-1T was an Amperite 115 VAC glass-envelope, 
octal-based time-delay relay with one normally-open contact.  It was 30 
seconds delay, so that would be  a 115NO030.  I found that both time 
delay relay coils in the rig are actually running on 230 VAC (as are 
all the control circuits) with a 6k resistor in series to drop it to 

While I was restoring my rig, I found the contacts on K5 "bounced" upon 
make, so it would have an irregular start-up time and would sometimes 
bounce three or four time before finally settling down.  To fix the 
problem, I pulled the relay, wrapped it in a towel, and smashed the 
glass.  Then I burnished the contacts, tested it, then glued a small 
bottle upside-down in place of the original glass.

I found 30 seconds to be a bit long for the low-voltage enable delay, 
so I ended up replacing the Amperite with an octal programmable 
solid-state timer relay I had on hand set to 15 seconds.  The K4 relay 
for the HV enable delay was excessively long too, a couple minutes as I 
recall, so I ultimately moved the 115NO030 to the K4 socket to become 
the HV inhibit TD relay.

Steve WD8DAS

sbjohnston at aol.com
Radio is your best entertainment value.

AOL now offers free email to everyone.  Find out more about what's free 
from AOL at AOL.com.

More information about the AMRadio mailing list

This page last updated 25 Feb 2018.