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Author Topic: connector model-type for keying output on mfj-495 keyer ???  (Read 2300 times)
KC8Y
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Posts: 240




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« on: November 01, 2013, 05:49:59 PM »

I have just acquired the MFJ-495 keyer.  BUT the instruction manual DOES NOT mention the size or type of plug for the KEYING OUTPUT jack. It states "....Keying output:  This unit supports..." and goes on; it NEVER says ?

If anyone knows, what type/size kindly let me know.

Because of my handicap, I cannot solder or assemble any wires.  Must purchase an cable-assembly ALREADY soldered to the plug for the keyer and the other end must be connected to a 1/4" plug for the transceiver  (Already tried a 1/8" [3.5mm] plug that does not go-in all-the-way).

Sure hope I picked the correct forum area for this question Huh


Ken KC8Y


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AA4PB
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Posts: 12776




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« Reply #1 on: November 01, 2013, 06:46:43 PM »

According to page 3 of the manual, the keying output uses an RCA plug. You must set some internal jumpers to set the output for a positive or a negative keying radio.
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KC8Y
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Posts: 240




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« Reply #2 on: November 01, 2013, 07:12:48 PM »

Thank you for the response AA4PB...

I see that, BUT I said where can I obtain  a full cable-assembly (ALREADY SOLDERED HAVING BOTH PLUGS Huh?

Ken KC8Y
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AD9DX
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Posts: 1477




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« Reply #3 on: November 01, 2013, 07:39:15 PM »

Would a cheap RadioShack RCA cable work then if you need, an adapter for the next location? RadioShack has a plethora of adapters that would plug directly in to the other side of the RCA cable.
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EX, KC9TRM, KB9IRZ
VA7CPC
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Posts: 2375




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« Reply #4 on: November 01, 2013, 08:02:58 PM »

You need two plugs:

. . . One plugs into the keyer -- that's the "RCA phono plug"

. . . The other plugs into your rig's "KEY" jack.

For _most_ rigs (and just about all older rigs), the rig has a 1/4" phone jack.  So the plug into the rig is a 1/4" _monophonic (mono) phone plug_.  For some rigs (e.g. Yaesu FT-817 and FT-450), it's a 1/8" _monophonic phone plug_.

Radio Shack should have both possibilities -- there's nothing exotic, and they are standard audio adapter cables. 

. . . But you need to know what the rig expects.

.      Charles
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KC8Y
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Posts: 240




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« Reply #5 on: November 02, 2013, 12:52:32 PM »

VA7CPC:

I took your advice.  Went on Radioshack's website; found the exact item(s) that I needed

Ordered:  "...6-ft.Shielded Cable, 1/4" Plug-to-RCA Plug..." 

Hope it solves my problem ?   Thanks again Smiley

Ken KC8Y
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KC8Y
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Posts: 240




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« Reply #6 on: November 10, 2013, 01:05:48 PM »

I've attained the cable having, both an RCA-plug & a 1/4" plug, already.  Practicing via the keyboard-setting the speed I need with the keyer.

I plan to be back on CW (boy, does it feel good Smiley  ) in a few weeks.

Ken KC8Y

 
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