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Kenwood tm241a issues

Skyler

New Member
Feb 2, 2014
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I just got a used Kenwood tm241a.
It was working fine on my friends antenna until I took it home and hooked it up to a used Larsen nla-mm antenna I bought at a ham-fest.

It seemed to work fine on that antenna for a bit until I was hearing a weird hum out of the speaker on the higher edge of the 2 meter band on 50 watts. My Baofeng handheld picked up all of this spurious emissions on any frequency I tuned to.

I then decided to test it one more time with a friend on a repeater, and it transmitted this weird one-tone beep when I keyed up the microphone, and didn't stop when I unkeyed it, the transmitting stopped only when I unplugged the microphone, rebooted the radio, and plugged the mic back in. The beep pitch changed by pressing different buttons on the mic, but wasn't the familiar two-tone DTMF, and was a one-tone beeping.

Is this radio fried, or is there a way to fix it? Does the DTMF mic possibly have a problem, or is it most likely an internal radio issue? The day I finally got a nice 50 watt radio for my net control, and the courage classic bike race, It burned out. I cant see a nice kenwood die, and as a cheapo high school student, cant afford a new radio {Cry_river} {Cry_river}

73
KDØWHB
 

KD4UPL

Member
Aug 5, 2012
51
9
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The single tone your hearing, is it possible the 1,750 Hz tone burst? Unless you're in Europe I'd turn that off. This is the American version of the radio, right?
I bought a TM-241A brand new back in 1993 for $300. Everyone told me how great a price that was. The radio had a button that always stuck which was fixed under warranty. The display went haywire and I fixed that myself by cleaning, wiggling, and tightening an internal connector. It had a third problem I was just living with. I sold it in less than a year.
My only other experience with a Kenwood has been a TS-2000. It's been to the shop twice in 2 years and needs to go again.
I'm so done with anything Kenwood related.
 

RatsoW8

Supporting Member, W9WDX ARC Member - WD8T
Nov 3, 2009
3,102
1,408
273
West Central Michigan
My experience is that any 2m rig from that era is a gamble regardless of the brand. Except for the Radio shack rigs I avoid old 2/440 mobile rigs like the plague.
 
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Skyler

New Member
Feb 2, 2014
16
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I fixed it. The mic was a bad mic, and the 12 volt SLA battery was low, explaining the weird noises on fifty watts! Now the question is, where can I find a cheap compatible DTMF mic?
 

Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
16,992
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Nova Scotia,Canada
I fixed it. The mic was a bad mic, and the 12 volt SLA battery was low, explaining the weird noises on fifty watts! Now the question is, where can I find a cheap compatible DTMF mic?


That will do it. You should have mentioned you were on an SLA battery and not a power supply. A battery won't last too long with 50 watts out and all kinds of weird things can happen then.
 

Skyler

New Member
Feb 2, 2014
16
2
3
24
That will do it. You should have mentioned you were on an SLA battery and not a power supply. A battery won't last too long with 50 watts out and all kinds of weird things can happen then.

Yeah, I kinda still have to find a good power supply. I don't do my 50 watts that long, and my battery is not horrible, it is 17 amp hours.

I looked on e-bay and the only microphones for that radio didn't have DTMF. Does anyone have any links to a mic that does have DTMF and is compatable with the 8-pin connector?
KenMic-Jack-8.gif
 

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