Roughly 5 A at 50 Mhz? with an unstable reading on the power supply

?

Il 23/08/23 10:51, Andrew Lenton ha scritto:

How much current is it drawing at full throttle

Get

On 22 Aug 2023, at 21:27, "ik0oky via " <yahoo.it@groups.io target=_blank>ik0oky=@groups.io> wrote:

Dear FT 847 owners,

after 20 + years of honest service few days ago my FT 847 started to
loose output power on HF and 50/70 Mhz.

Now on HF and 50/70 Mhz it delivers only less that 10 w out.

I suspect some "boiled" component in the LPF bank or the final devices
gone....

It has been used intensively on 50 Mhz ft8 but never at full throttle power.

Any hints? for a similar experience are welcome.

IK0OKY Emilio

How much current is it drawing at full throttle

Get

On 22 Aug 2023, at 21:27, "ik0oky via " <yahoo.it@groups.io target=_blank>[email protected]> wrote:

Dear FT 847 owners,

after 20 + years of honest service few days ago my FT 847 started to 
loose output power on HF and 50/70 Mhz.

Now on HF and 50/70 Mhz it delivers only less that 10 w out.

I suspect some "boiled" component in the LPF bank or the final devices 
gone....

It has been used intensively on 50 Mhz ft8 but never at full throttle power.

Any hints? for a similar experience are welcome.

IK0OKY Emilio

Dear FT 847 owners,

after 20 + years of honest service few days ago my FT 847 started to 
loose output power on HF and 50/70 Mhz.

Now on HF and 50/70 Mhz it delivers only less that 10 w out.

I suspect some "boiled" component in the LPF bank or the final devices 
gone....

It has been used intensively on 50 Mhz ft8 but never at full throttle power.

Any hints? for a similar experience are welcome.

IK0OKY Emilio

OK! TNX for answer.

How do I remove the front knob of the radio? I need to clean the board.

73

----- Mensagem de Andrew Lenton <a@...> ---------

Data: Tue, 22 Aug 2023 13:26:31 +0100

De: Andrew Lenton <a@...>

Assunto: Re: [YaesuFT847] No S meter reading

Para: [email protected]

Hi S meter is derived from the agc level, do a place to start

73

Andrew on beach in Cornwall

Get

On 22 Aug 2023, at 13:00, Jaime Eloy <cu3ak@...> wrote:

My FT847 do not have any s meter reading. Audio seems ok as tx also.

Where to look pse for this issue?

73

CU3AK

Eloy

----- Fim da mensagem de Andrew Lenton <a@...> -----

On 22 Aug 2023, at 14:04, Andy Bosworth <sidthepop@...> wrote:

?

Do a reset on radio first before finding a fault that may not exist.
VFO knob is removed by turning radio upside down, look at shuffle jog, there is a slot in it. Use small Allen Key, about 1.5mm or 2mm and there is grubscrew in main knob.

On Tue, 22 Aug 2023 at 13:55, Jaime Eloy <cu3ak@...> wrote:

OK! TNX for answer.

How do I remove the front knob of the radio? I need to clean the board.

73

----- Mensagem de Andrew Lenton <a@...> ---------

Data: Tue, 22 Aug 2023 13:26:31 +0100

De: Andrew Lenton <a@...>

Assunto: Re: [YaesuFT847] No S meter reading

Para: [email protected]

Hi S meter is derived from the agc level, do a place to start

73

Andrew on beach in Cornwall

Get

On 22 Aug 2023, at 13:00, Jaime Eloy <cu3ak@...> wrote:

My FT847 do not have any s meter reading. Audio seems ok as tx also.

Where to look pse for this issue?

73

CU3AK

Eloy

----- Fim da mensagem de Andrew Lenton <a@...> -----

My FT847 do not have any s meter reading. Audio seems ok as tx also.
Where to look pse for this issue?
73
CU3AK
Eloy

On 1 Aug 2023, at 13:31, Steven KC3DOW via groups.io <treasurebox7762@...> wrote:

?Hello Spence,
This is results of the continuity measurements.
I measured continuity between pins 7 and 8 at the bottom of the mic and it tested OK. so the mic itself is good.
I then measured pins 7 and 8 from the cord going to the base and the end that goes to the mic and no reading.
When I measure pins 7 and 8 in the cord that goes to the phone jack to the radio I get no reading.
I tried with the PTT off and down with the same results (radio off))

Regarding the mic gain I followed your instructions with no results (transmits but no audio)

Thank You,
Steven/kc3dow

On 1 Aug 2023, at 00:19, Jeff M0UHF <jeff.elliott45@...> wrote:

? All you have to do is turn the microphone on, you will find a switch underneath on the base. Some radios it will work on both of us. It will only work on position one or position two.?

Sent from Jeff M0UHF?

On 31 Jul 2023, at 23:11, Spence M0STO via groups.io <unavailable.equal@...> wrote:

? Sorry forgot to ask if you have tried shouting into the mic in SSB.?

? Also the shield/ground wire is between the mic element and the internal cabling. Replacing the external cable won’t solve this problem.

De Spence M0STO?

Sent while portable! please excuse typos.

On 31 Jul 2023, at 23:08, Spencer Tomlinson <unavailable.equal@...> wrote:

?Hi, Steven,

? ? ? ? ? ? ? ? ? ?I’ve had a few MD100’s and they have a common failing. The shield wire drops off and you lose microphone ground (not to be confused with signal ground on pin 5). The actual mic is wired to Pin 8 and pin 7. Check continuity between pin 7 as this is the shield wire and microphone ground.

? First you normally get an annoying hum with your audio that eventually becomes no audio.

?This may or not be your problem but I’ve got a genuine brand new mic element here that was bought because I misdiagnosed the element as faulty when it was actually the mic shield/ground wire.

? Also remember the FT847 has an option to have the FM mic gain on the front knob or from a present in the display. The MD100-ADX has really poor gain in my experience. ?Menu 25 FM-Pset. Turn that up to max for testing (level from off to 0 to 63) and also the front mic gain obviously if this is set to off.

? I hope this helps.

De Spence M0STO?

Sent while portable! please excuse typos.

On 31 Jul 2023, at 22:20, Steven KC3DOW via groups.io <treasurebox7762@...> wrote:

?

I have a Yaesu MD-100A8X microphone connected to a Yaesu FT-847 radio and when I press the PTT the radio shows a carrier going out and the carrier is being seen by all parties but no audio. Through the repeater..

?

I don’t think the problem is in the radio because when I connect the hand microphone it works OK.

?

I have no idea how to troubleshoot this but I am a quick learner. I replaced the mic. To radio cord but I still have the problem.

?

Thanks,

Steven/kc3dow

Note. I posted this on the other ft-847 group thinking it was here.
It seems that I was not a member of this group.

On 31 Jul 2023, at 23:11, Spence M0STO via groups.io <unavailable.equal@...> wrote:

? Sorry forgot to ask if you have tried shouting into the mic in SSB.?

? Also the shield/ground wire is between the mic element and the internal cabling. Replacing the external cable won’t solve this problem.

De Spence M0STO?

Sent while portable! please excuse typos.

On 31 Jul 2023, at 23:08, Spencer Tomlinson <unavailable.equal@...> wrote:

?Hi, Steven,

? ? ? ? ? ? ? ? ? ?I’ve had a few MD100’s and they have a common failing. The shield wire drops off and you lose microphone ground (not to be confused with signal ground on pin 5). The actual mic is wired to Pin 8 and pin 7. Check continuity between pin 7 as this is the shield wire and microphone ground.

? First you normally get an annoying hum with your audio that eventually becomes no audio.

?This may or not be your problem but I’ve got a genuine brand new mic element here that was bought because I misdiagnosed the element as faulty when it was actually the mic shield/ground wire.

? Also remember the FT847 has an option to have the FM mic gain on the front knob or from a present in the display. The MD100-ADX has really poor gain in my experience. ?Menu 25 FM-Pset. Turn that up to max for testing (level from off to 0 to 63) and also the front mic gain obviously if this is set to off.

? I hope this helps.

De Spence M0STO?

Sent while portable! please excuse typos.

On 31 Jul 2023, at 22:20, Steven KC3DOW via groups.io <treasurebox7762@...> wrote:

?

I have a Yaesu MD-100A8X microphone connected to a Yaesu FT-847 radio and when I press the PTT the radio shows a carrier going out and the carrier is being seen by all parties but no audio. Through the repeater..

?

I don’t think the problem is in the radio because when I connect the hand microphone it works OK.

?

I have no idea how to troubleshoot this but I am a quick learner. I replaced the mic. To radio cord but I still have the problem.

?

Thanks,

Steven/kc3dow

Note. I posted this on the other ft-847 group thinking it was here.
It seems that I was not a member of this group.

On 31 Jul 2023, at 23:08, Spencer Tomlinson <unavailable.equal@...> wrote:

?Hi, Steven,

? ? ? ? ? ? ? ? ? ?I’ve had a few MD100’s and they have a common failing. The shield wire drops off and you lose microphone ground (not to be confused with signal ground on pin 5). The actual mic is wired to Pin 8 and pin 7. Check continuity between pin 7 as this is the shield wire and microphone ground.

? First you normally get an annoying hum with your audio that eventually becomes no audio.

?This may or not be your problem but I’ve got a genuine brand new mic element here that was bought because I misdiagnosed the element as faulty when it was actually the mic shield/ground wire.

? Also remember the FT847 has an option to have the FM mic gain on the front knob or from a present in the display. The MD100-ADX has really poor gain in my experience. ?Menu 25 FM-Pset. Turn that up to max for testing (level from off to 0 to 63) and also the front mic gain obviously if this is set to off.

? I hope this helps.

De Spence M0STO?

Sent while portable! please excuse typos.

On 31 Jul 2023, at 22:20, Steven KC3DOW via groups.io <treasurebox7762@...> wrote:

?

I have a Yaesu MD-100A8X microphone connected to a Yaesu FT-847 radio and when I press the PTT the radio shows a carrier going out and the carrier is being seen by all parties but no audio. Through the repeater..

?

I don’t think the problem is in the radio because when I connect the hand microphone it works OK.

?

I have no idea how to troubleshoot this but I am a quick learner. I replaced the mic. To radio cord but I still have the problem.

?

Thanks,

Steven/kc3dow

Note. I posted this on the other ft-847 group thinking it was here.
It seems that I was not a member of this group.

On 31 Jul 2023, at 22:20, Steven KC3DOW via groups.io <treasurebox7762@...> wrote:

?

I have a Yaesu MD-100A8X microphone connected to a Yaesu FT-847 radio and when I press the PTT the radio shows a carrier going out and the carrier is being seen by all parties but no audio. Through the repeater..

?

I don’t think the problem is in the radio because when I connect the hand microphone it works OK.

?

I have no idea how to troubleshoot this but I am a quick learner. I replaced the mic. To radio cord but I still have the problem.

?

Thanks,

Steven/kc3dow

Note. I posted this on the other ft-847 group thinking it was here.
It seems that I was not a member of this group.