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Author Topic: Using a ft-897d w/ Dentron MLA-2500  (Read 1454 times)
KA9TZU
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Posts: 52




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« on: August 14, 2006, 07:18:05 AM »

I am try to figure out the best way to use my Dentron with my new Yaesu FT-897D. I believe the CAT output does have a way of closing to ground when transmiting, which is what the Dentron requires. Another thought, is I still have my FRB-757 amplifier relay from another radio. Could I use the PTT output on the data connection of the radio and use the FRB-757 to switch the amp? Is this just overkill? Can the CAT output handle an older amp like the Dentron MLA-2500?

Thanks in advance for any help offered!

K9JMS
Formally KA9TZU
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WB2WIK
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Posts: 21836




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« Reply #1 on: August 14, 2006, 08:38:21 AM »

The TX GROUND connection at the CAT connector on the FT-897D is rated +50V at up to 400mA.  It is a transistor switch and not a relay.  It cannot handle any negative voltage, nor any AC voltage.

What is the keying voltage and current of the MLA-2500?

If you don't know, you can easily measure this just using an ordinary VOM or DMM.

To measure the keying voltage, just connect the meter across the keying terminals on the Dentron, and turn the amplifier on.  Whatever voltage the meter reads is the keying voltage.

To measure the keying current, switch the meter to read current (like 1A full scale for a VOM) and listen to hear the relay in the amplifier "click," indicating the relay closed and the amp is going into XMIT.  Then, read the current on the meter.  Whatever it reads is the keying current.

If the voltage is +50Vdc or less, and the keying current is below 400mA, you're all set.  If not, use the ARB interface.

WB2WIK/6
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