Hi all,
Since the MD-36D8 DTMF microphones are no longer available, has anyone modified something like a Yaesu MH-36A6J with the modular plug?? Is there an aftermarket version available i'm not aware of?
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Many thanks indeed Andrew, will do.
73s
Emilio
Il 25/08/23 22:32, Andrew Lenton ha
scritto:
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They are not test points but links, you have to
remove and insert an amp meter and measure the current, it is in
the service manual, first check the I/P to the amp first.
From memory something lile 400ma and 1 amp, the
bias pots are known to fail
73
Andrew
Get
On 25 Aug 2023, at 21:00, "ik0oky via "
< yahoo.it@groups.io
target=_blank> [email protected]> wrote:
Yes, will have a look at the test points of the HF PA unit
Thanks
Il 25/08/23 11:03, Andrew Lenton
ha scritto:
The HF PA is under the main board, tricky
to get to but doable
73
Get
|
They are not test points but links, you have to remove and insert an amp meter and measure the current, it is in the service manual, first check the I/P to the amp first.
From memory something lile 400ma and 1 amp, the bias pots are known to fail
73
Andrew
Get
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Show quoted text
Yes, will have a look at the test points of the HF PA unit
Thanks
Il 25/08/23 11:03, Andrew Lenton ha scritto:
The HF PA is under the main board, tricky to get to but doable
73
Get
|
Yes, will have a look at the test points of the HF PA unit
Thanks
Il 25/08/23 11:03, Andrew Lenton ha
scritto:
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Show quoted text
The HF PA is under the main board, tricky to get
to but doable
73
Get
On 24 Aug 2023, at 18:56, "ik0oky via "
< yahoo.it@groups.io
target=_blank> [email protected]> wrote:
Many thanks? indeed for the hint.
Will have a look at the testing procedure in the service
manual
Yes, 144 and 432 Mhz are fine.
Regards
Emilio IK0OKY
Il 23/08/23 22:40, Andrew Lenton
ha scritto:
Ok then the PA transistors are not been
driven, 100 Watts is over 20 Amps, so it is not the low
pass filters.
You will need to probe the HF PA, check the
bias pots? are are creating the correct quesiant current,
are you able to measure the input to the PA board, it
should be 100 mW
73
The TX strip does have a set up procedure,
and a number of test point to check
I presume VHF and UHF are fine?
73
Andrew
Get
|
The HF PA is under the main board, tricky to get to but doable
73
Get
toggle quoted message
Show quoted text
Many thanks? indeed for the hint.
Will have a look at the testing procedure in the service manual
Yes, 144 and 432 Mhz are fine.
Regards
Emilio IK0OKY
Il 23/08/23 22:40, Andrew Lenton ha scritto:
Ok then the PA transistors are not been driven, 100 Watts is over 20 Amps, so it is not the low pass filters.
You will need to probe the HF PA, check the bias pots? are are creating the correct quesiant current, are you able to measure the input to the PA board, it should be 100 mW
73
The TX strip does have a set up procedure, and a number of test point to check
I presume VHF and UHF are fine?
73
Andrew
Get
|
toggle quoted message
Show quoted text
Many thanks? indeed for the hint.
Will have a look at the testing procedure in the service manual
Yes, 144 and 432 Mhz are fine.
Regards
Emilio IK0OKY
Il 23/08/23 22:40, Andrew Lenton ha scritto:
Ok then the PA transistors are not been driven, 100 Watts is over 20 Amps, so it is not the low pass filters.
You will need to probe the HF PA, check the bias pots? are are creating the correct quesiant current, are you able to measure the input to the PA board, it should be 100 mW
73
The TX strip does have a set up procedure, and a number of test point to check
I presume VHF and UHF are fine?
73
Andrew
Get
|
Many thanks? indeed for the hint.
Will have a look at the testing procedure in the service manual
Yes, 144 and 432 Mhz are fine.
Regards
Emilio IK0OKY
Il 23/08/23 22:40, Andrew Lenton ha
scritto:
toggle quoted message
Show quoted text
Ok then the PA transistors are not been driven,
100 Watts is over 20 Amps, so it is not the low pass filters.
You will need to probe the HF PA, check the bias
pots? are are creating the correct quesiant current, are you
able to measure the input to the PA board, it should be 100 mW
73
The TX strip does have a set up procedure, and a
number of test point to check
I presume VHF and UHF are fine?
73
Andrew
Get
On 23 Aug 2023, at 19:39, "ik0oky via "
< yahoo.it@groups.io
target=_blank> [email protected]> wrote:
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
|
Ok then the PA transistors are not been driven, 100 Watts is over 20 Amps, so it is not the low pass filters.
You will need to probe the HF PA, check the bias pots? are are creating the correct quesiant current, are you able to measure the input to the PA board, it should be 100 mW
73
The TX strip does have a set up procedure, and a number of test point to check
I presume VHF and UHF are fine?
73
Andrew
Get
toggle quoted message
Show quoted text
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
|
Roughly 5 A at 50 Mhz? with an unstable reading on the power
supply
?
Il 23/08/23 10:51, Andrew Lenton ha
scritto:
toggle quoted message
Show quoted text
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
|
How much current is it drawing at full throttle
Get
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
|
Hi I think they are pull off, however, check there are no small screw holes.
Check the RX IF circuit for the AGC line I do not have a circuit with me, but I will be at home in 7 days
73
Andrew
Get
On 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
Hi S meter is derived from the agc level, do a place to start
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@...> -----
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May be a silly suggestion, is IF shift in correct position?
On Tue, 22 Aug 2023 at 14:20, Jaime Eloy < cu3ak@...> wrote:
I already did a reset. Same.?
TNX already removed the knob.
73
Data: Tue, 22 Aug 2023 14:04:13 +0100
Assunto: Re: [YaesuFT847] No S meter reading
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
Hi S meter is derived from the agc level, do a place to start
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@...> -----
|
I already did a reset. Same.?
TNX already removed the knob.
73
Data: Tue, 22 Aug 2023 14:04:13 +0100
Assunto: Re: [YaesuFT847] No S meter reading
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
Hi S meter is derived from the agc level, do a place to start
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@...> -----
|
 Sent while portable! please excuse typos.
toggle quoted message
Show quoted text
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
Hi S meter is derived from the agc level, do a place to start
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@...> -----
|
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
Hi S meter is derived from the agc level, do a place to start
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@...> -----
|
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
Hi S meter is derived from the agc level, do a place to start
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@...> -----
|
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
|
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
|
Re: No audio in Yaesu MD-100A8X Microphone and yaesu md-100 A8X
Sounds like a cable problem. ?
? Do you know someone with an MD100 who you can borrow their cable? ?At least lend them your cable and see if it’s working.?
? ?Need to think about this and try some testing in one of my MD100 and get back to you.
De Spence M0STO? Sent while portable! please excuse typos.
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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
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Richard
Andrew Lenton
Andy Bosworth
Spence G5STO