Amplifier not keying with 6400M and AL80B.

Mick

Hi, I've got my amplifier connection coming out from TX1, but it will not key the amp. Its an Ameritron AL80B.
When I take the RCA end out and put it to ground it keys, so it's not the amp.
Everything in the Transmit menu is set to default.

Mack

Please post a screen shot of your transmit setting. Have you tried Tx2 or Tx3. 73, Mack W4AX Alpha Team

George KF2T

Make sure the relay is active in the rig setup. If I recall, the TX1,2,3 relays are not active by default. If you’re sure you’ve got it enabled, check the RCA connector with an ohmmeter to confirm it’s closing. The relay is rated to 140 mA, and the Ameritron specs 100 mA, but I am not sure I’d trust MFJ with my Flex. An isolating interface box is a good idea when switching a relay coil, since voltage spikes could be present far in excess of normal values.

Mick

Yes, I've tried all 3. Sorry about the upside down, don't know why it did that.

Mick

I have the ARB704 in line.

FISHULA X

 I see RCA TX1 Is set to Zero, Change it. Should be good then.

Mack

This is the screen I’d like to see. TX1 must have a check mark. https://images.app.goo.gl/ajBhJve67PBwESMX8

FISHULA X

 When Smart SDR is running go to upper left to settings. Then go to TX band settings.
 Make sure  the RCA TX1 is checked . I have a 6300 and using 2,51.
 This is most likely your issue, Let us know.  Good luck.

Mick

It is all unchecked as pictured.

Mick

Fixed it, Thank you so much.

Mack

TX1 must be checked. Mack W4AX

Mick

That was it.

Mick

Done.

Mack

Great! Glad it’s working.

KL4QG

Same happen to me with Ten Tec Titan 425 with 6400M

Stephen Hawkins NG0G

I am having the same problem with my 6400M and an acom 1200s. I don't use the windows software just the radio.

David Decoons, wo2x

Go to TX Band Settings from main menu and check TX1 for each band you want to use the amp on. Make sure RCA cable plugged into TX1 on radio.

Dave wo2x

Stephen Hawkins NG0G

Thank you. I don't recall ever having to do that before.

Stephen NG0G

David Decoons, wo2x

Older versions of software had the ability to enable TX1 from the TX tab. New versions of the software have a new feature called TX Band Settings table where you can set the TX1, 2 , and 3 lines on, RF power per band, tune power and other settings.

Dave wo2x