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CDM1550LS+ Transmit Problem

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ffnremtwhitby
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CDM1550LS+ Transmit Problem

Postby ffnremtwhitby » Thu May 08, 2014 10:20 am

My CDM1550LS+ VHF radio receives very well, but transmitts very poorly. I have changed antennas with no change. There is a lot of crackling, static, and hum in the receiving radios when this one transmits. Sometimes, if you hold the transmit button for about 20 seconds or so, the problem goes away and transmission clears up. I have swapped mics as well with no change. I have also tried dropping transmission power without improvment as well. Any ideas?

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jackhackett
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Re: CDM1550LS+ Transmit Problem

Postby jackhackett » Thu May 08, 2014 11:48 am

Take the plastic cover off the radio chassis, and check that the bolts that hold the radio together are tight. You'll probably find that they're very loose.

ffnremtwhitby
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Re: CDM1550LS+ Transmit Problem

Postby ffnremtwhitby » Thu May 08, 2014 12:22 pm

That was it. Thanks

mmckenna
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What radios do you own?: AM/FM with 8 track.

Re: CDM1550LS+ Transmit Problem

Postby mmckenna » Sat May 10, 2014 8:35 am

Wow, good timing. The CDM1250 in my wife's car was starting to make odd noises on TX. I replaced the mic, checked the power feed, and a few others. Was just about ready to pick up another one. Ran across this post just in time. Tightened the screws and it's working top notch again. Thanks.
"The nice thing about standards is that there are so many to choose from."

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Bill_G
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Re: CDM1550LS+ Transmit Problem

Postby Bill_G » Sat May 10, 2014 11:23 am

Usually it's the loose screw across the microphone, but not today ...

(big grin)

AEC
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Re: CDM1550LS+ Transmit Problem

Postby AEC » Fri May 23, 2014 12:35 pm

I despise that carbon/rubber pad on the CDMs, a loose cover places the radio into 'test' mode.

mmckenna
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Joined: Wed Aug 28, 2002 7:01 pm
What radios do you own?: AM/FM with 8 track.

Re: CDM1550LS+ Transmit Problem

Postby mmckenna » Fri May 23, 2014 12:39 pm

Bill_G wrote:Usually it's the loose screw across the microphone, but not today ...

(big grin)


Ah yes, like the "loose nut behind wheel" issue that I see happen with cars.
"The nice thing about standards is that there are so many to choose from."

Will
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Re: CDM1550LS+ Transmit Problem

Postby Will » Fri May 23, 2014 12:53 pm

mmckenna wrote:Ah yes, like the "loose nut behind wheel" issue that I see happen with cars.


"the loose nut behind the microphone" for radio operators.... ...

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SteveC0625
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What radios do you own?: CDM's, CP's, CM's, and more

Re: CDM1550LS+ Transmit Problem

Postby SteveC0625 » Fri May 23, 2014 2:00 pm

Will wrote:
mmckenna wrote:Ah yes, like the "loose nut behind wheel" issue that I see happen with cars.


"the loose nut behind the microphone" for radio operators.... ...

The official term is "short between the headphones." :)


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