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Author Topic: Yaesu FT-840 to FL-2100B  (Read 581 times)
KB3KCJ
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Posts: 125




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« on: February 28, 2013, 08:20:37 AM »

Does anyone have this particular hookup.  I am wondering if I have to have the Yaesu special cable for amp hookup or can I use the PTT and ALC RCA jacks?
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K2DC
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« Reply #1 on: February 28, 2013, 10:52:21 AM »

You can't use the PTT jack on the FT-840.  That's used to externally key the rig, not for the rig to key an amp.  You'll need to go to the Band Data connector on the rig.  Pin 2 on the rig end goes to terminal "RY" on the 2100, and Pin 8 on the rig end goes to terminal "E" on the 2100.  The 2100 uses a 12V relay for keying, so you don't need any type of additional interface.

The manuals for both the FT-840 and the FL-2100 are both easy to find online, and you should study them both thoroughly before trying any of this.  (I can tell that you haven't already because you asked the question, hi).

73,

Don, K2DC
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WB2WIK
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« Reply #2 on: February 28, 2013, 11:13:59 AM »

You can't use the PTT jack on the FT-840.  That's used to externally key the rig, not for the rig to key an amp.  You'll need to go to the Band Data connector on the rig.  Pin 2 on the rig end goes to terminal "RY" on the 2100, and Pin 8 on the rig end goes to terminal "E" on the 2100.  The 2100 uses a 12V relay for keying, so you don't need any type of additional interface.

That's not quite right.  Pin 2 of the 8-pin BAND DATA plug goes to "RY" on the FL-2100B and pin 3 of the BAND DATA plug (ground) goes to "E" on the FL-2100B.  Pin 8 is for TX ENABLE when controlled by a QSK amplifier, which the FL-2100B is not.  So for use with the FL-2100B, you don't use pin 8 of the BAND DATA plug for anything.



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