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IC-7000 with full ALC in HF

 

Hi guys

I have in my hands an IC-7000 with several issue.

One of them is the following :

in HF I had 100 watt in all bands, no problem but ALC meter goes always in full-red zone, the ALC scale is full.

I beleive was an adj issue so I have dona all adjustament as service manual describes.

Before bias driver and finals (1? & 2), no problem, Gain HF1, HF2, HF3; then power 1, 10 , 25, 50, 75, 90 and 105 watt, perfect !

ALC setting ok

But when I go in RTTY full power I have ALC meter completly in full scale (red)

I suppose there is an block in TX-chain doesn't work very well so CPU pumps ALC to max.

Does anyone have any suggestions ?

Thanks in advance.

73s, Pasquale IW0HEX
 

The ALC is derived from the forward power senseor. As the power control is working, the fault dhould not br too difficult

KR

Andrew

Get
On 22 Mar 2025, at 23:53, "Pasquale S via " <yahoo.it@groups.io target=_blank>[email protected]> wrote:

Hi guys

I have in my hands an IC-7000 with several issue.

One of them is the following :

in HF I had 100 watt in all bands, no problem but ALC meter goes always 
in full-red zone, the ALC scale is full.

I beleive was an adj issue so I have dona all adjustament as service 
manual describes.

Before bias driver and finals (1? & 2), no problem, Gain HF1, HF2, HF3; 
then power 1, 10 , 25, 50, 75, 90 and 105 watt, perfect !

ALC setting ok

But when I go in RTTY full power I have ALC meter completly in full 
scale (red)

I suppose there is an block in TX-chain doesn't work very well so CPU 
pumps ALC to max.

Does anyone have any suggestions ?

Thanks in advance.

73s, Pasquale IW0HEX
 

How does the ALC behave using SSB, where are you feeding in the RTTY signals?

On SSB set mic gain to zero, there should be no ALC when you speak.

73

Andrew



Get
On 22 Mar 2025, at 23:53, "Pasquale S via " <yahoo.it@groups.io target=_blank>[email protected]> wrote:

Hi guys

I have in my hands an IC-7000 with several issue.

One of them is the following :

in HF I had 100 watt in all bands, no problem but ALC meter goes always 
in full-red zone, the ALC scale is full.

I beleive was an adj issue so I have dona all adjustament as service 
manual describes.

Before bias driver and finals (1? & 2), no problem, Gain HF1, HF2, HF3; 
then power 1, 10 , 25, 50, 75, 90 and 105 watt, perfect !

ALC setting ok

But when I go in RTTY full power I have ALC meter completly in full 
scale (red)

I suppose there is an block in TX-chain doesn't work very well so CPU 
pumps ALC to max.

Does anyone have any suggestions ?

Thanks in advance.

73s, Pasquale IW0HEX

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