[ICOM] IC-746 PRO Keying

[Larry L. Hinton]

Hi all,

I meant to add that if you use a STEREO plug for the straight key and wire
it as shown in the manual, you can use it either in the front [ELECT-KEY] or
the rear [KEY] jacks.

Larry
K7YBZ

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Larry L. Hinton
Sent: Monday, December 31, 2012 12:56 PM
To: 'ICOM Reflector'
Subject: Re: [ICOM] IC-746 PRO Keying

Hey all.

I understand the confusion. The Instruction Manual (A-6085H-1US-2) states: 

a. Iambic Key paddle: Use a 6.35(d) mm (1/4") STEREO plug and connect to the
[ELEC-KEY] jack located on the front of the radio.
b. Straight Key: Use a 6.35(d) mm (1/4") MONO plug and connect key to the
back of the radio.
c. External Keyer: Use a 6.35(d) mm (1/4") MONO plug and connect to the back
of the radio.
d. Computer Keying: Use a 6.35(d) mm (1/4") MONO plug and connect to the
back of the radio.

HOWEVER, the wiring diagram for the straight key (diagrammed to the [KEY]
jack on the back panel) shows a "STEREO" plug with the tip as (+) and the
sleeve as (-).

I found the service manual and took a look at the keyer [KEY] jack for the
back panel. It actually makes no difference which plug is used as long as
the (+) is tip and the (-) is on the sleeve. According to the schematic, the
ring is not connected unless someone has modified the unit so shorting the
tip and ring in this jack is not an issue.

Larry
K7YBZ

>> IIRC (I'm away from home), the straight key is supposed to use the 
>> TIP
and SLEEVE of the key jack. The 2-circuit plug in 
>> the 3-way jack would continuously ground both TIP and RING contacts. 
 

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