[ICOM] 775 DXII S-meter lamp / cooling fan noise

[Maciej Wieczorek]

Ed and others,

Last weekend I've done some more tests. The lamp flickers mostly on CW when 
power output exceeds 50W, but it's also happening on AM/FM. For the moment, 
to ged rid of this I simply increased a bit the brigthtness for the LOW 
position and the problem is almost gone.

Unfortunately I've found another bad point in my IC 775, seems that the 
cooling fan which starts with PTT (while transmiting) is not filtered enough 
and makes some noise which can be heard on SSB... I was really surprised 
when it appeared that after disconnecting the microphone the noise is still 
there and can be easily noticed in local distance QSO.

Has anyone ever had this kind of problem?

73's
Mac SP2XF

----- Original Message ----- 
From: <ma.locksmith at juno.com>
To: <mw_comercial at wp.pl>
Sent: Wednesday, January 18, 2006 2:55 PM
Subject: Re: [ICOM] IC 775 DX II S-meter lamp flickering


> Besides being irritating, it MIGHT show a real problem.....
>
> If the lamp flickers, then the voltage is changing......  but, why?  What
> else is powered from that voltage?
>
> If it's a key up/key down difference, then you might possibly have a
> prime power supply issue where the input drops from 13.8 volts when you
> transmit and this drop is affecting the lower voltage regulators in the
> set.
>
> Do you get a similar happening on AM.....  anything with a constant
> carrier?
>
> Ed
> K1ZOK
>
> On Wed, 18 Jan 2006 13:47:42 +0100 "Maciej Wieczorek"
> <mw_comercial at wp.pl> writes:
>> Hello from Poland,
>>
>> unfortunately I noticed that the s-meter lamp flickers while
>> transmiting on
>> CW, if the display brightness is adjusted to LOW.
>>
>> Is there any mod to ged rid of this? It's quite irritating...
>>
>>
>> TNX
>> 73's
>> Mac SP2XF
>>
>>
>