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[IC-7000] Strange issues with output power

 

George

The finals are either working or they are not - 0% or 100 %
A big culprit is usually either the power supply - it MUST supply
a minimum of 13.8 volts even under load or else it drops power.
Or else the fuse holders need cleaning - there might be a voltage
drop on them.
The IC-7000 is EXTREMELY sensitive to voltage - more than any other
radio I have seen. It needs 13.8 - 14.8 volts or else it is not happy.
Even the two IC-7000's in my mobiles will not put out full power until
the motor is running and the alternator kicks in at 14.4 volts (they
will typically give me 60 watts with just the battery)

73
John

On 20 Dec 2012, at 7:42 PM, George <george.smart1@...> wrote:

Hi All.

I have had an Icom IC-7000 for over a year now, having bought it second hand. Today I went to use the for a few SSB QSOs on 20 metres when I realised I couldn't get more than 40 watts out.

Initially I thought that the PA amp may be at fault, but after playing around some more, I learned that the power I get varies wildly with band. Setting the radio to 100% power out, I get the following measured powers with a Bird Thruline into a dummy load:

- 160 metres, 1 watt.
- 80 metres, 1 watt.
- 40 meters, 10 watts.
- 20 metres, 40 watts.
- 12 metres, 60 watts.
- 10 metres, 90 watts.
- 6 metres, 30 watts.
- 2 metres, 49 watts (fine).
- 70 cms, 37 watts (fine).

It seems the issues are in the HF PA, i.e. anything on Antenna 1. I'm not sure what the issue is. I think something like a capacitor gone down, or a relay stuck? I'm not sure.

Any help would be greatly received.

Thanks in advance.
George Smart, M1GEO.





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