[ICOM] IC 7000

[Anders Janis SM4RNA]

Absolutly correct, but my point is that ambient is about never 50C. Not in 
the schack or in the car anyway. Possibly the junction temperature can reach 
50C. But then it is short time so ageing unless it is a repeater would not 
be a real problem.

10-15 years ago I did som tests with audio amps in the car. I drove a pair 
of amps for two 12" base speakers so hard that the soldering to the finals 
melted twice and had to be re-solderd. I still use the amps in the car but 
for midrange to day.

de Anders SM4RNA

----- Original Message ----- 
From: "Mort Arditti" <marditti at dslextreme.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Friday, June 27, 2008 7:59 PM
Subject: Re: [ICOM] IC 7000


> The simple fact is that as temperature goes up, reliability rapidly goes 
> down. At some point,
> as temperature increases beyond a point depends on the design the 
> reliability decreases
> very rapidly.
> At 50 degrees C ambient, the internal temperature will be significantly 
> higher, and the
> junction temperatures higher yet.  Don't be surprised if the junction 
> temperatures may
> be in the 70 degrees C or higher.
> Unfortunately. most commercial equipment manufacturers push components to 
> the limit
> with very little safety margin.  Once dust begins to accumulate and air 
> flow gets impaired
> watch out for problems.  All one has to do is open a PC that has been in 
> use for 12 - 18
> months and look at all the accumulated dust on every cooling fans and heat 
> sink fins.
> The next step - problems.
> Thanks
>
> Mort, KB6BSN
>
>
> ----- Original Message ----- 
> From: "Anders Janis SM4RNA" <sm4rna at telia.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Friday, June 27, 2008 9:26 AM
> Subject: Re: [ICOM] IC 7000
>
>
>> Humans and electronics do not have the same temperature range. If 
>> something is 10C warmer than bodytemperature (37C + 10C = 47C) it is 
>> unpleasant to touch.
>>
>> The radios are specified to work in an ambient of -10 to +50'C (+14 to 
>> +122'F) +50'C is very unplesant to touch, and then 50'C is what you will 
>> have BEFORE you switch the radio on.
>>
>> If I remeber correct most components are specified 75'C or higher.
>>
>> Again, humans and electronics do not have the same temperature range.
>>
>>
>> /Anders SM4RNA
>>
>>
>> ----- Original Message ----- 
>> From: "John Geiger" <aa5jg at lcisp.com>
>> To: "ICOM Reflector" <icom at mailman.qth.net>
>> Sent: Friday, June 27, 2008 4:06 PM
>> Subject: Re: [ICOM] IC 7000
>>
>>
>>> What is so difficult about Icom (and other manufacturers) having the fan 
>>> run
>>> all of the time?  Don't they want the rigs to stay cool?
>>>
>>> 73s John AA5JG
>>>
>>> ----- Original Message ----- 
>>> From: " KO7T" <ko7t at dc.rr.com>
>>> To: <icom at mailman.qth.net>
>>> Sent: Friday, June 27, 2008 1:21 PM
>>> Subject: [ICOM] IC 7000
>>>
>>>
>>>> All or at least the later models of ICOM transceivers the fan only 
>>>> comes
>>> on
>>>> during TX
>>>>
>>>>
>>>>
>>>> My solution was found on eBay where I purchased a fan that plugged into
>>> the
>>>> tuner Molex socket of my 746PRO
>>>>
>>>>
>>>>
>>>> Cost was $21 including shipping    Just go to search and look for ICOM
>>>> cooling fan
>>>>
>>>>
>>>>
>>>> Gene KO7T
>>>>
>>>> ----
>>>> 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/
>>>>
>>>
>>> ----
>>> 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/
>>
>> ----
>> 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/
>>
>
>
> ----
> 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/