Date   

Re: ALC Problem

 

The ALC controls the power and this voltage will change due to a number of reasons. 
The set power from the CPU, SWR, temperature, current etc.
Take a look at the ALC line voltage to see what this voltage is doing as the power changes in the time frame you are interested in.
You have POVC, FORL, AMS, ICH, ICL, IDS, RELF, EALC, UNUSB, and ALCL that all affect power by changing the ALC voltage.y
Investigating this area for a voltage that changes with the power output should aim you toward the problem area(s).
If the ALC voltage does not change with the power output then it is likely that the problem could be somewhere else, but I would first rule out this area as it has direct causation on the power output of the radio.


Re: ALC Problem

Prabhu
 

Dear Paul,
I also suspect RD70HHF1 ..possibly replace with another one and check with dummy load,


Regards


On Sunday, 19 July 2020, Pasquale S via groups.io <iw0hex=yahoo.it@groups.io> wrote:
> Hi Paul, thanks for your answer
>
>  
>
> It’s no a problem related to temperature, RF power goes up slowly, very slowly about 5 seconds to arrive 100 watt !!! This is the first time, then it’s faster.
>
>  
>
> In VHF and UHF there is no problem, so I suppose there is no problem with pre-driver and driver, everything runs well.
>
>  
>
> IN HF/50 I changed RD70HHF1 because I had a fault before; in your opionion, can RD70HHF1 be the problem ???? Vth is about 2 volt, it seems too little value.
>
>  
>
> Regards
>
>  
>
> Pasquale IW0HEX
>
>  
>
>  
>
> Inviato da Posta per Windows 10
>
>  
>
> Da: Paul
> Inviato: domenica 19 luglio 2020 03:32
> A: ic7000@groups.io
> Oggetto: Re: [ic7000] ALC Problem
>
>  
>
> Hi Pasquale ,
>
> In what time frame does it go up? , is it slowly or fast , could it be a temperature related thing as something needs to be warmed up .
>
> I think you'd need a oscilloscope to investigate the drama to see where the slow increase is actually happening RF wise like at the pre-driver or driver or even before that as being new finals i doubt if the issue is from there .
>
> Also i'd be checking around the power setting dc rail for any variations but the Cro would be far quicker (if you have one) , 73 Paul .
>
>  
>
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Re: ALC Problem

Pasquale S
 

Hi Paul, thanks for your answer

 

It’s no a problem related to temperature, RF power goes up slowly, very slowly about 5 seconds to arrive 100 watt !!! This is the first time, then it’s faster.

 

In VHF and UHF there is no problem, so I suppose there is no problem with pre-driver and driver, everything runs well.

 

IN HF/50 I changed RD70HHF1 because I had a fault before; in your opionion, can RD70HHF1 be the problem ???? Vth is about 2 volt, it seems too little value.

 

Regards

 

Pasquale IW0HEX

 

 

Inviato da Posta per Windows 10

 

Da: Paul
Inviato: domenica 19 luglio 2020 03:32
A: ic7000@groups.io
Oggetto: Re: [ic7000] ALC Problem

 

Hi Pasquale ,

In what time frame does it go up? , is it slowly or fast , could it be a temperature related thing as something needs to be warmed up .

I think you'd need a oscilloscope to investigate the drama to see where the slow increase is actually happening RF wise like at the pre-driver or driver or even before that as being new finals i doubt if the issue is from there .

Also i'd be checking around the power setting dc rail for any variations but the Cro would be far quicker (if you have one) , 73 Paul .

 


ALC Problem

Pasquale S
 

 

Hi guys

I’m repairing an IC-7000, I put 2 new finals RD70HHF1 and I set bias 100% (1 A for each final)

But I have a strange behaviour ; the power goes up slowly, for example if I set 100 watt , power is 20 watt then goes up until 100 watt; same thing if I set 50 or 70 watt for example.

I change the cable, I use now one without fuses. I have done adjustment 3 times, no effect.  In VHF / UHF my 7000 is perfect, no trouble.

 

Any ideas ?

 

Thanks in advance

 

73s Pasquale IW0HEX

 

Inviato da Posta per Windows 10

 


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Re: ALC problem

Pasquale S
 

Hi guys

I’m repairing an IC-7000, I put 2 new finals RD70HHF1 and I set bias 100% (1 A for each final)

But I have a strange behaviour ; the power goes up slowly, for example if I set 100 watt , power is 20 watt then goes up until 100 watt; same thing if I set 50 or 70 watt for example.

I change the cable, I use now one without fuses. I have done adjustment 3 times, no effect.

In VHF / UHF my 7000 is perfect, no trouble.

Any ideas ?

Thanks in advance

73s Pasquale IW0HEX

 

 

Inviato da Posta per Windows 10

 

Da: J.D. Barron
Inviato: mercoledì 15 luglio 2020 13:30
A: ic7000@groups.io
Oggetto: Re: [ic7000] ALC and audio Tx problem

 

I had this problem with one of my IC-7000s. My symptoms were full ALC on SSB and 100% + output on all other modes.
Turning the power down has no effect.
The ALC circuit gets one input from the SSB logic on the UNSB line to the Q1606 FET that changes the ALC bias.
In my case the FET was bad it I recall correctly. What happened was the voltage on the line that gose to the op-amps was low (?). What happened was Q1606 shorted and the two 2.2 meg (series R1641 & 1636) were always pulled low and did not change when switched to SSB mode by that signal from the NUSB line. if I remember correctly it is high when not in USB. 
Your mileage may vary.
I have attached a copy of the schematic for this part of the circuit.
IC1601 are the op-amps that vary the ALC bias to control power and fold back due to SWR etc.

 


Re: ALC and audio Tx problem

Peter Hewitson
 

Thanks for the very detailed explanation. I will see what I can do. 73, Peter
 


Re: ALC and audio Tx problem

 

I had this problem with one of my IC-7000s. My symptoms were full ALC on SSB and 100% + output on all other modes.
Turning the power down has no effect.
The ALC circuit gets one input from the SSB logic on the UNSB line to the Q1606 FET that changes the ALC bias.
In my case the FET was bad it I recall correctly. What happened was the voltage on the line that gose to the op-amps was low (?). What happened was Q1606 shorted and the two 2.2 meg (series R1641 & 1636) were always pulled low and did not change when switched to SSB mode by that signal from the NUSB line. if I remember correctly it is high when not in USB. 
Your mileage may vary.
I have attached a copy of the schematic for this part of the circuit.
IC1601 are the op-amps that vary the ALC bias to control power and fold back due to SWR etc.


ALC and audio Tx problem

Peter Hewitson
 

On Tx, ALC is full scale on all modes but no output on SSB. Transmits on CW and AM but still getting full scale ALC on meter. Any clues? Thanks Peter


Re: CAT (Remote) port is dead

 

The tip is "hot and the RX and TX lines are tied together for the IC7000


On Mon, Jul 13, 2020 at 9:48 AM Max via groups.io <kg4pid=yahoo.com@groups.io> wrote:
You have me curious. You said 'I measure an open circuit between the cat connector (ring/shield) and rig ground'. Why aren't you measuring 'Tip to Ring' ? Not saying you don't have a problem as I've never checked 'Ring to Ground'. I would expect a pullup to 5V across 'Tip to Ring' but I don't have a schematic to look at. 

Have you double checked your address and such?

Max KG4PID


On Sunday, July 12, 2020, 10:49:49 AM CDT, tiim via groups.io <timdapice=yahoo.com@groups.io> wrote:

[Edited Message Follows]
Hello group,

I cannot control my 7000 via cat. It's been 10 years since i tried it since I had it mobile all the time. I have a rig blaster plug and play and that works on my 7610 and Yaesu FT817ND, but not my 7000.

I measure an open circuit between the cat connector (ring/shield) and rig ground. I read that it means I have a transistor or smt fuse problem.

I opened the top cover and immediately thought, oh crud, I don't want to have to remove ribbon cables!

Is it time for a shop to fix this? Any recommendations for a shop? I am bummed, was hoping to use it for FT8 this coming weekend. I think I'll just have to manually run split and find an open tx slice. I think that's all I need to do and then send it off when I return home.

Any suggestions are appreciated.

Thanks and 73,

Tim
KA1YBS



--
J.D. Barron


Re: CAT (Remote) port is dead

Max
 

You have me curious. You said 'I measure an open circuit between the cat connector (ring/shield) and rig ground'. Why aren't you measuring 'Tip to Ring' ? Not saying you don't have a problem as I've never checked 'Ring to Ground'. I would expect a pullup to 5V across 'Tip to Ring' but I don't have a schematic to look at. 

Have you double checked your address and such?

Max KG4PID


On Sunday, July 12, 2020, 10:49:49 AM CDT, tiim via groups.io <timdapice@...> wrote:

[Edited Message Follows]
Hello group,

I cannot control my 7000 via cat. It's been 10 years since i tried it since I had it mobile all the time. I have a rig blaster plug and play and that works on my 7610 and Yaesu FT817ND, but not my 7000.

I measure an open circuit between the cat connector (ring/shield) and rig ground. I read that it means I have a transistor or smt fuse problem.

I opened the top cover and immediately thought, oh crud, I don't want to have to remove ribbon cables!

Is it time for a shop to fix this? Any recommendations for a shop? I am bummed, was hoping to use it for FT8 this coming weekend. I think I'll just have to manually run split and find an open tx slice. I think that's all I need to do and then send it off when I return home.

Any suggestions are appreciated.

Thanks and 73,

Tim
KA1YBS


Re: Videos

Tom KD8AVF <kd8avf@...>
 

Do a internet search for ICOM IC-7000 mods and you will find complete lists of acceptable mods and videos on how to properly set it up.


On Sun, Jul 12, 2020 at 1:51 AM, davethetechman via groups.io
<abners96@...> wrote:

Hi, does anyone have any personal videos of the radio with their own personal tips and hacks?

Recently new to this.

Thanks

 


Re: CAT (Remote) port is dead

Al Browne
 

From Memory and it is a while back now. There is a transistor in the input line that is very susceptible to damage from something as simple as plugging in or unplugging the cable to the signal link etc. But you'll need to look it up. I found it when I was researching how to fix a fried pre-driver FET.
Sorry can't remember the details

73 de Al G8YKM 


CAT (Remote) port is dead

tiim
 
Edited

Hello group,

I cannot control my 7000 via cat. It's been 10 years since i tried it since I had it mobile all the time. I have a rig blaster plug and play and that works on my 7610 and Yaesu FT817ND, but not my 7000.

I measure an open circuit between the cat connector (ring/shield) and rig ground. I read that it means I have a transistor or smt fuse problem.

I opened the top cover and immediately thought, oh crud, I don't want to have to remove ribbon cables!

Is it time for a shop to fix this? Any recommendations for a shop? I am bummed, was hoping to use it for FT8 this coming weekend. I think I'll just have to manually run split and find an open tx slice. I think that's all I need to do and then send it off when I return home.

Any suggestions are appreciated.

Thanks and 73,

Tim
KA1YBS


Videos

davethetechman <abners96@...>
 

Hi, does anyone have any personal videos of the radio with their own personal tips and hacks?

Recently new to this.

Thanks

 


Re: Ic-7000 separation kit

g4abx
 

I was initially concerned that the plugs might drop out of the HDMI connectors -- but no, not even with my Land Rover 90 doing some bumpy 'green laning' :-)

73
Bruce G4ABX


On Fri, 3 Jul 2020 at 15:20, Mike <beally@...> wrote:
Thanks Bruce, appreciate the vote of confidence. 
73 Mike VK6MB 


Re: Ic-7000 separation kit

Mike <beally@...>
 

Thanks Bruce, appreciate the vote of confidence. 
73 Mike VK6MB 


Re: Ic-7000 separation kit

g4abx
 

Mike
I have one of those HDMI-based separation cable kits and it works very well.
I think I dealt directly (rather than ebay) it was a year or so ago but if you get stuck, I can probably dig out the details

73
Bruce G4ABX


Re: Ic-7000 separation kit

Mike <beally@...>
 

Thanks Paul, 
Have sent email to him

73 Mike VK6MB 


Re: Ic-7000 separation kit

Mike <beally@...>
 

I've recently purchased an IC-7000 and am looking for the separation cable, without much to show for it. Is there a work-around to enable me to separate the head

73 Mike VK6MB

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