[ICOM] IC 7000

[Mort Arditti]

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/
>