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RT-11 tuner


Mike N7ZEF
 

Howdy;
?I have an LDG RT-11 tuner that I am wanting to use with my Icom IC-725. It just doesn't seem to be working. I press the tuner button on the radio, it looks like it is working, and then stops back to receiving. The indicator on the radio says "Through".? I have an meter connected to the output, it shows no power output.
?I am using a cable I made using what I found on the net.
?I would appreciate any help or suggestions.
?73
?Mike - N7ZEF


 

Hi Mike,

I recently bought an RT-11 from an estate auction. It came with the Icom wiring. I'm using it with a Kenwood TS-2000 so I built a smaller version of the remote head and that setup has been working fine for me.

I'd be happy to make a? deal with you on this cable if you're interested, or I can provide you an actual pin-out if you want to confirm your cable.

Have you tried the setup with a dummy load? At least you can remove one variable with that.

Doug
WA7DJS
Lynden, WA.?


Mike N7ZEF
 

?Doug;
Thanks for the reply.?
?I have tried it on a dummy load. No difference.
?If you send a pinout of the cable would be great.?
?I will consider the purchase of the cable at a later time
?Thanks
?73
?Mike - N7ZEF


 

Hi Mike,?
There are no numbers on the Molex connector but if I start from the pointed end:
Pin 1 - Green wire - pin 7 on DB9 - Radio out
Pin 2 - White wire - pin 3 on DB9 - Tune Mode Select
Pin 3 - Red wire - Pin 1 on DB9 - 12v power
Pin 4 - Black wire - Pin 8 on DB9 - Ground

I hope this helps.

I have no other thoughts on your problem but I would be happy to make comparison measurements if you get into troubleshooting.

73?
Doug
WA7DJS


 

¿ªÔÆÌåÓý

?

No brainer here.

?

This is from the LG website and the part costs $US10 already made.

?

Neil VK5ZEE

?

From: [email protected] <[email protected]> On Behalf Of Mike N7ZEF
Sent: Saturday, 15 January 2022 16:53
To: [email protected]
Subject: Re: [ldgelectronics] RT-11 tuner

?

?Doug;
Thanks for the reply.?
?I have tried it on a dummy load. No difference.
?If you send a pinout of the cable would be great.?
?I will consider the purchase of the cable at a later time
?Thanks
?73
?Mike - N7ZEF


Mike N7ZEF
 

Thanks for the information. I had a wire in the wrong place on the DB-9. Right colors, wrong place. Don't know where I found the info to wire it in the first place, but it is right now.
?Thanks to all for the help and suggestions! Working great now!
?73
?Mike - N7ZEF


 

Glad you got the problem figured out!

Happy QSO's

73
Doug
WA7DJS


 

I just built a control cable cable for the RT-11 and it works great with my ICOM 735. ? The RT-11 is very nice design considering the vintage.