# Kenwood TM-241A direct discriminator out

I am going to do a simple SIMPLEX all-star node, using the URIx USB radio interface, which I just got. I have a Kenwood TM-241A transceiver.

I was told the speaker out jack is not sufficient:

The goal is access to output not influenced by the radio squelch or volume controls.

I was also told that there are high-pass filters in many radios which will eliminate most CTCSS, so I can't use the CTCSS_DET pin.

Does the Kenwood tm-241a have a place in it I can find with discriminator out, which I could solder some audio wires to?

• I don't know about that specific radio, but usually this sort of thing is found on a TNC interface. It might reference "9600 baud" in some way, because 9600 baud TNCs have similar requirements. Look for a round, mini-din connector. – Phil Frost - W8II Apr 9 '14 at 12:21
• Just skimming through the manual and images I can find on Google I couldn't find any clear illustration of such a port on that particular radio. Is there anything on the back or sides labeled "TNC" or "DATA" or "PACKET"? – Phil Frost - W8II Apr 9 '14 at 12:30
• @PhilFrost Having two of those radios in my junk pile, I can confirm that there is only an Audio Out jack. – W5VO Apr 10 '14 at 14:08
• I know there is only Audio Out on the OUTSIDE of the radio, but I am wondering if there is a Test point or something Directly from the Discriminator. I Don't care if I have to solder a tiny wire to a surface mount component, all radios operate on a basic principal, and there should be a place before the audio amp&filter. – Skyler 440 Apr 10 '14 at 23:50
• Does anybody here know if it will just work with audio out? All I am mainly worried about is picking up CTCSS tones. I can just turn the squelch off, and turn the volume knob to a certain level (or even solder a fixed resistor and disable the knob) and just hook her up. Even If I have to use a AF attenuator – Skyler 440 Apr 10 '14 at 23:53