[ICOM] 746

[Gary Fiber]

It was shorted but so far as I remember no other damage occurred. The current through the filter is very limited an generally feed in with a capacitor. We saw this not real frequent but it was something to tell the customer before sending in the radio.

Gary P. Fiber K8IZ
gfiber1952 at gmail.com
gfiber at comcast.net




> On Jan 31, 2016, at 10:05 AM, Kelly Taylor <ve4xt at mymts.net> wrote:
> 
> Hi Gary,
> 
> I don't dispute the Icom tech theory, but what is the usual occurrence when a signal path is shorted to ground? It dies, no?
> 
> OP reported not a dead radio when the filter was selected, but zero change in operating parameters. No change in bandwidth, but still receiving as if no filter change had been enacted. 
> 
> K
> 
> Sent from my iPhone
> 
>> On Jan 31, 2016, at 9:58 AM, Gary Fiber <gfiber at comcast.net> wrote:
>> 
>> The techs at Icom found at times a filter was to tightly pressed into place. The filter case was shorting the actual in /out connections to ground. Pulling the filter out just a little solved the trouble. A more permanent repair was to insulate the bottom of the filter case. This did not happen on all radios but a few we saw this. 
>> 
>> I have been gone from Icom for coming onto 15 years so tech things are fading a bit these days. 
>> 
>> Gary P. Fiber 
>> gfiber1952 at gmail.com
>> gfiber at comcast.net
>> 
>> 
>> 
>> 
>>> On Jan 31, 2016, at 9:40 AM, Kelly Taylor <ve4xt at mymts.net> wrote:
>>> 
>>> Wouldn't a bad or shorted filter make the radio sound dead? I tend to go with the reset-turned-off-filter-settings theory. 
>>> 
>>> Kelly
>>> ve4xt 
>>> 
>>> Sent from my iPhone
>>> 
>>>> On Jan 30, 2016, at 3:24 PM, Gary Fiber <gfiber at comcast.net> wrote:
>>>> 
>>>> You might also just gently pull up on the filter. I have seen the filter case short to the mounting holes. Sometimes placing some electrical tape on the filter bottom will prevent it from happening. Could also be a filter that has gone bad.
>>>> 
>>>> Gary P. Fiber K8IZ
>>>> gfiber1952 at gmail.com
>>>> gfiber at comcast.net
>>>> 
>>>> 
>>>> 
>>>> 
>>>>> On Jan 30, 2016, at 2:10 PM, Lloyd Curry <lloyd.na4d at gmail.com> wrote:
>>>>> 
>>>>> I have an original Icom 746 (non-pro) with the 500 hz cw filter. The
>>>>> filter has stopped working. When I push in the filter button the "nar"
>>>>> appears on the screen but there is no change in the audio or bandwith.
>>>>> Any ideas?
>>>>> 
>>>>> -- 
>>>>> Lloyd C. Curry
>>>>> Amateur Radio NA4D
>>>>> Greensburg, KY
>>>>> 
>>>>> I'm so nice I wish I had a friend just like me.
>>>>> ----
>>>>> 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
>>> ----
>>> 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
> ----
> 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