What are the specifications for the TX Relay Outputs on the FLEX-6000?

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  • Updated 11 months ago
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Are there any electrical specifications for the TX Relay connections?
Are they open collectors or drains?
Or are they actual relay contacts?
What is the maximum current and voltage?
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Tim - W4TME, Customer Experience Manager

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Posted 5 years ago

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Graham - KE9H, Official Rep

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The TX1, TX2, and TX3 are open drain outputs suitable for driving
relays (or logic inputs) directly. The load or logic to be driven should
appear as a pull-up to some positive voltage source.

Open circuit voltage should not exceed +40 Volts DC. Closed circuit
current is 150 mA continuous max, and 500 mA peak max. There is the
equivalent of a +45 Volt Zener across the output to ground that will clamp
any positive going transient peaks at about +45 to 50 Volts.

--- Graham / KE9H
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Gerald Youngblood

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You can review the full specifications for the TPIC6B595 the relay driver we use at:


Gerald, K5SDR
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Why do all the TX1,2,3 outputs fall out at the same time with release of PTT? They are timed going in, but collapse simultaneously with PTT release or TX delay, whichever is the >
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Tim - W4TME, Customer Experience Manager

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This is a great feature enhancement suggesting that's separate from the main topic, so I created a new topic to in the Share an Idea category to continue the discussion. Please reference the new topic here: Add a feature that would make the TX Relay act like a sequencer
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David Ahrendts

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Tim, I want to create a simple "On The Air" lighted sign for my Flex 6500. Is there any problem in running 12VDC through TX1-2-3 without a relay for a few LEDs? Thanks.

David A., KK6DA, Los Angeles
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Tim - W4TME, Customer Experience Manager

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The spec in the FLEX-6000 hardware manual state +40 VDC @ 140 mA maximum