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I hear audio in the speaker when transmitting

1TW810
 
Edited

Hi, I checked the voltage on the accessory molex(4pin tuner) , on the back of the radio, and noticed a difference between reception and transmission of 1 volt. Trying at max power in FM the voltage passes from 13.72 (RX) to 12.70 (TX). It's to normal 1v drop? Thank you
Geoff
 

The mic lead had a open shield at its connector, so fault was the in the mic lead not the radio.


On Sun, 8 Jan 2023, 08:39 , <marco.lafranca@...> wrote:
Hi Jeff,
i'm using the original ic706 mic, i haven't tried another mic. I tried plugging it into the back connector as well but it's the same. Was your problem inside the microphone or on the connector? thanks

On Sat, Jan 7, 2023 at 10:11 PM, Geoff wrote:
Have you tried another mic?

I've had rf getting into a mic during Tx due to a bad shielding connection.

Geoff
Brian (N2MLP)
 

If the circuit is working correctly 


On Jan 7, 2023, at 4:50 PM, marco.lafranca@... wrote:

No, the radio is original, no mods.
no, the radio is original, no modifications. I was wondering what should I check regarding the TR relay

On Sat, Jan 7, 2023 at 12:26 AM, Brian (N2MLP) wrote:
Has this radio been modified 
That is no welds
 
Check that the circuit is blocking the rec.
On transmitting 

 

On Jan 6, 2023, at 5:49 PM, marco.lafranca@... wrote:

Hi guys, thank you all for your replies.

@Hugh: My radio is a 706mkiig, it shouldn't have the monitor functionality.

@davebb: I haven't tried the data socket yet. Now I also write in the other forum.

@Brian, @davebb
Regarding the T/R relay (RL1 on the filter board?), what kind of checks should I do on the circuit? do you check the welds? check its driver Q1? or other? thank you

@Rick Robinson: I've already done some checks on the screws, masses and cables. Which card in particular should I check?
1TW810
 

No, the radio is original, no mods.
no, the radio is original, no modifications. I was wondering what should I check regarding the TR relay


On Sat, Jan 7, 2023 at 12:26 AM, Brian (N2MLP) wrote:
Has this radio been modified 
That is no welds
 
Check that the circuit is blocking the rec.
On transmitting 

 

On Jan 6, 2023, at 5:49 PM, marco.lafranca@... wrote:

Hi guys, thank you all for your replies.

@Hugh: My radio is a 706mkiig, it shouldn't have the monitor functionality.

@davebb: I haven't tried the data socket yet. Now I also write in the other forum.

@Brian, @davebb
Regarding the T/R relay (RL1 on the filter board?), what kind of checks should I do on the circuit? do you check the welds? check its driver Q1? or other? thank you

@Rick Robinson: I've already done some checks on the screws, masses and cables. Which card in particular should I check?
1TW810
 

Hi Jeff,
i'm using the original ic706 mic, i haven't tried another mic. I tried plugging it into the back connector as well but it's the same. Was your problem inside the microphone or on the connector? thanks

On Sat, Jan 7, 2023 at 10:11 PM, Geoff wrote:

Have you tried another mic?

I've had rf getting into a mic during Tx due to a bad shielding connection.

Geoff
Geoff
 

Have you tried another mic?

I've had rf getting into a mic during Tx due to a bad shielding connection.

Geoff
Brian (N2MLP)
 

Has this radio been modified 
That is no welds

Check that the circuit is blocking the rec.
On transmitting 


On Jan 6, 2023, at 5:49 PM, marco.lafranca@... wrote:

Hi guys, thank you all for your replies.

@Hugh: My radio is a 706mkiig, it shouldn't have the monitor functionality.

@davebb: I haven't tried the data socket yet. Now I also write in the other forum.

@Brian, @davebb
Regarding the T/R relay (RL1 on the filter board?), what kind of checks should I do on the circuit? do you check the welds? check its driver Q1? or other? thank you

@Rick Robinson: I've already done some checks on the screws, masses and cables. Which card in particular should I check?
1TW810
 

Hi guys, thank you all for your replies.

@Hugh: My radio is a 706mkiig, it shouldn't have the monitor functionality.

@davebb: I haven't tried the data socket yet. Now I also write in the other forum.

@Brian, @davebb
Regarding the T/R relay (RL1 on the filter board?), what kind of checks should I do on the circuit? do you check the welds? check its driver Q1? or other? thank you

@Rick Robinson: I've already done some checks on the screws, masses and cables. Which card in particular should I check?
Danny K5CG
 

Even though this is an IC-7000 group, the radio in question is an IC-706MKiiG so it can't be that.

From: "Hugh McLaughlin via groups.io" <hughmcl23@...>
To: "ic7000" <ic7000@groups.io>
Sent: Friday, January 6, 2023 12:15:17 PM
Subject: Re: [ic7000] I hear audio in the speaker when transmitting

I meant PG 87 & 128. Sorry

Hugh
KL7HM
On Friday, January 6, 2023 at 11:12:58 AM MST, Hugh McLaughlin <hughmcl23@...> wrote:


Hi,

Do you have the "monitor function" on? PG 87 & 1228 of the manual. If you can hear yourself talk through the speaker you might want to check it.

73
Hugh
KL7HM

On Friday, January 6, 2023 at 10:48:21 AM MST, <marco.lafranca@...> wrote:


Hi,
Thank you davebb123456 for your hint.
Today I was able to test the radio with a dummy load. The problem manifests itself the same way as the antennas I tested. I am attaching an example video. So can it be ruled out that it is RF getting back into the radio?
Any other ideas?
Thank you.

https://youtu.be/Pgg8lQx0YjM
Rick Robinson
 

My suggestion is to open the radio and snug,not over tighten, the circuit board mounting board screws and check all ribbon cables for full and square insertion. I took the extra step and used exact size star washers for a proper “bite”. This step will certainly not hurt anything if done carefully. It helped a audio problem I had with my 706MK2G that I ran mobile. 

On Fri, Jan 6, 2023 at 2:41 PM davebb123456 <davidbrowne76@...> wrote:
Hi Marco
This is very loud and clear I would now say it is not RF getting back to the radio,
You do not hear FM because of the way it is modulated,
Try and have a look at the TX/RX switching,what happens if you use the data socket, also have you asked in the 706 forums?
Dave 2E0DMB

On Wed, 28 Dec 2022, 19:25 , <marco.lafranca@...> wrote:
Hi everyone,
i am having the same problem with my icom 706mk2g. The problem of the audio emitted by the speaker in TX occurs on all bands, mainly in AM and a little in SSB, and grows by increasing the RF power. However, it does not appear on FM. Tried checking grounds on all boards (loosening and tightening screws and securing contact points with outer case), but no fix. Is the only way to mute the speaker? Also I noticed that toroidal inductor L174 makes a loud hum on AM.
Thank you.

--
Rick
Genesis 1-29
Brian (N2MLP)
 

Check TR switching circuit 



On Jan 6, 2023, at 2:44 PM, Hugh McLaughlin via groups.io <hughmcl23@...> wrote:


Hi,

Do you have the "monitor function" on? PG 87 & 1228 of the manual. If you can hear yourself talk through the speaker you might want to check it.

73
Hugh
KL7HM

On Friday, January 6, 2023 at 10:48:21 AM MST, <marco.lafranca@...> wrote:


Hi,
Thank you davebb123456 for your hint.
Today I was able to test the radio with a dummy load. The problem manifests itself the same way as the antennas I tested. I am attaching an example video. So can it be ruled out that it is RF getting back into the radio?
Any other ideas?
Thank you.

https://youtu.be/Pgg8lQx0YjM
Hugh McLaughlin
 

I meant PG 87 & 128. Sorry

Hugh
KL7HM
On Friday, January 6, 2023 at 11:12:58 AM MST, Hugh McLaughlin <hughmcl23@...> wrote:


Hi,

Do you have the "monitor function" on? PG 87 & 1228 of the manual. If you can hear yourself talk through the speaker you might want to check it.

73
Hugh
KL7HM

On Friday, January 6, 2023 at 10:48:21 AM MST, <marco.lafranca@...> wrote:


Hi,
Thank you davebb123456 for your hint.
Today I was able to test the radio with a dummy load. The problem manifests itself the same way as the antennas I tested. I am attaching an example video. So can it be ruled out that it is RF getting back into the radio?
Any other ideas?
Thank you.

https://youtu.be/Pgg8lQx0YjM
Hugh McLaughlin
 

Hi,

Do you have the "monitor function" on? PG 87 & 1228 of the manual. If you can hear yourself talk through the speaker you might want to check it.

73
Hugh
KL7HM

On Friday, January 6, 2023 at 10:48:21 AM MST, <marco.lafranca@...> wrote:


Hi,
Thank you davebb123456 for your hint.
Today I was able to test the radio with a dummy load. The problem manifests itself the same way as the antennas I tested. I am attaching an example video. So can it be ruled out that it is RF getting back into the radio?
Any other ideas?
Thank you.

https://youtu.be/Pgg8lQx0YjM
davebb123456
 

Hi Marco
This is very loud and clear I would now say it is not RF getting back to the radio,
You do not hear FM because of the way it is modulated,
Try and have a look at the TX/RX switching,what happens if you use the data socket, also have you asked in the 706 forums?
Dave 2E0DMB

On Wed, 28 Dec 2022, 19:25 , <marco.lafranca@...> wrote:
Hi everyone,
i am having the same problem with my icom 706mk2g. The problem of the audio emitted by the speaker in TX occurs on all bands, mainly in AM and a little in SSB, and grows by increasing the RF power. However, it does not appear on FM. Tried checking grounds on all boards (loosening and tightening screws and securing contact points with outer case), but no fix. Is the only way to mute the speaker? Also I noticed that toroidal inductor L174 makes a loud hum on AM.
Thank you.
Danny K5CG
 

I can see it now, thanks.

It sounds very like the MONITOR feature (as in the IC-7000) but I don't think that is a feature in the IC-706 line.

Very weird.

From: "marco lafranca" <marco.lafranca@...>
To: "ic7000" <ic7000@groups.io>
Sent: Friday, January 6, 2023 1:23:54 PM
Subject: Re: [ic7000] I hear audio in the speaker when transmitting

Excuse me, try again.

1TW810
 

Excuse me, try again.
Danny K5CG
 

Video unavailable
This video is private

From: "marco lafranca" <marco.lafranca@...>
To: "ic7000" <ic7000@groups.io>
Sent: Friday, January 6, 2023 11:48:17 AM
Subject: Re: [ic7000] I hear audio in the speaker when transmitting

Hi,
Thank you davebb123456 for your hint.
Today I was able to test the radio with a dummy load. The problem manifests itself the same way as the antennas I tested. I am attaching an example video. So can it be ruled out that it is RF getting back into the radio?
Any other ideas?
Thank you.

https://youtu.be/Pgg8lQx0YjM
1TW810
 

Hi,
Thank you davebb123456 for your hint.
Today I was able to test the radio with a dummy load. The problem manifests itself the same way as the antennas I tested. I am attaching an example video. So can it be ruled out that it is RF getting back into the radio?
Any other ideas?
Thank you.

https://youtu.be/Pgg8lQx0YjM
davebb123456
 

Hi try putting a 50ohm dummy load on the radio and see if it still is happening, if it is not it is RF getting back into the radio,
Try a common mode choke on the coax at the antenna and if you still have it one at the radio end,
Dave

On Wed, 28 Dec 2022, 19:25 , <marco.lafranca@...> wrote:
Hi everyone,
i am having the same problem with my icom 706mk2g. The problem of the audio emitted by the speaker in TX occurs on all bands, mainly in AM and a little in SSB, and grows by increasing the RF power. However, it does not appear on FM. Tried checking grounds on all boards (loosening and tightening screws and securing contact points with outer case), but no fix. Is the only way to mute the speaker? Also I noticed that toroidal inductor L174 makes a loud hum on AM.
Thank you.
1TW810
 

Hi everyone,
i am having the same problem with my icom 706mk2g. The problem of the audio emitted by the speaker in TX occurs on all bands, mainly in AM and a little in SSB, and grows by increasing the RF power. However, it does not appear on FM. Tried checking grounds on all boards (loosening and tightening screws and securing contact points with outer case), but no fix. Is the only way to mute the speaker? Also I noticed that toroidal inductor L174 makes a loud hum on AM.
Thank you.

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