[ICOM] IC756 Pro III Filters

[Phil Krichbaum]

The Icom 756 PRO II and III rigs are very poorly protected against ESD 
as even with antennas disconnected and power off it can come in the 
neutral side of the power cord. You need to not only disconnect antennas 
but remove the power cord from any connection to power system. It is 
likely that turning the power strip off left the neutral connected to 
the PS and rig. I had a 756PROII destroyed when the antennas were 
removed from the radio and the Icom PS was off but the rig was toast and 
it (nearby lightening) came thru the neutral side as the power cord from 
the Icom PS was off but plugged into the wall outlet. The Icom PS 
survived and it is still in use with a 756PROIII yet today, some years 
later. If you are using two rigs on different bands at the same time in 
the same station, you could toast a 756 PRO II or III even with the 
other rig at the 100w level. Been there, done that too. Icom doesn't 
seem to think it is an issue? My 756PROIII is now a backup rig.

     Phil N0KE


On 9/30/2016 9:21 AM, Mike McCarthy, W1NR wrote:
> Clear the twin passband tuning? (PBT Clear)
>
> Mike, W1NR
>
> On 09/30/2016 10:54 AM, Mark K3MSB wrote:
>> Hello
>>
>> I've owned my radio for quite a few years (purchased new) and it's worked
>> without issue.
>>
>> Recently, I noticed that when I go to the 500 and 250 Hz filter settings on
>> CW,  the audio is like what you'd hear in the bottom of a barrel.
>>
>> Prior to this, when switching between the 1.2 Khz,  500, and 250 Hz filter
>> settings while copying a signal,  the signal was always centered.   Now,
>> for the 500 and 250 positions I have to adjust the main tuning slightly,
>> and the signal is not sharp and distinct.
>>
>> I've performed a reset on the radio which did nothing.
>>
>> Now, a few weeks ago during an electrical storm I heard a "pop" from the
>> radio bench.   All antennas were (of course) physically disconnected.   I
>> forgot to remove the power plug from the outlet strip, but the strip was
>> turned off.     Afterwards, as is currently the case,  aside from the
>> filter issue,  the radio works fine.
>>
>> Any ideas?
>>
>> Thank you
>>
>> Mark K3MSB
>> ----
>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
>> Icom FAQ: http://www.qsl.net/icom/
>> To support QSL/QTH.net: http://www.qsl.net/donate.html
>>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>