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Re: I hear audio in the speaker when transmitting

 

That isn't a problem I've encountered before, given what you've done to eliminate the usual causes.

One possiblity perhaps is someone has had the case off and some of the grounding spring fingers and pink RF absorbers aren't positioned correctly. There's a document with pictures of how they should look in this Group's Files section. Look for '7K Grounding Fingers.doc'.

Just to be safe, I would check the DC supply voltage as seen inside the radio while transmitting into a dummy load at 100 watts in CW or FM mode. Measure across pins 3 & 4 of the TUNER connector. You should have at least 13.0 VDC there, assuming your power supply is set for 13.8 VDC. If you have a high resistance in the power path somewhere that results in several volts drop under dynamic loads, it can cause various problems.

Poor shield connections (or slightly loose shells) on the PL-259 connectors can result in a lot of RF leakage right at the back panel, that really mess up the rear mic and speaker cable signals.

Lots of luck finding the problem or returning the unit.

Steve, W3AHL

--- In ic7000@..., "notcoldenough" wrote:

I just purchased a used IC 7000. When I transmit, I hear my voice in the speaker or headphones. It is a faint crackly reproduction of my voice. The speaker monitor menu is set to "off", so in theory at least, there should be no sound during transmitting.

The problem occurs in all bands, on both my antennas, and even while using my dummy load. The only way I have been able to stop it is to reduce the transmit power to 10%.

I cleaned the fuses, and even tried the power cable from my Kenwood. No difference.

I removed the tuner from the antenna circuit. No change.

Added split core ferrites to all leads on the radio. no change.

One odd thing I noticed is that when I lightly touch the headphone plug, the radio amplifies the sound of my touching the plug and outputs that sound into the speaker. And yes, I verified that headphone was plugged into the correct jack on the radio.


I have run out of things to check, so I plan on returning the used IC 7000 to the vendor. I am considering buying a new 7000, but I wanted to ask this group if other users hear audio while transmitting.

Thanks in advance for your responses.

John
KC0UUT
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