[Premium-Rx] Thermal Management Issues/Remote Operation in the UK

[John P Ceresole]

Hi List Members

Was interested in Berndt Josef Wulf's predicament - well 
unfortunately I have to agree entirely with Scott Schappert's 
view.  Problem is (to re-iterate) is that quite a lot of kit now 
coming onto the second hand market was designed with the military in 
mind and the military does what it's told and has to endure whatever 
discomfort is thrown at them.

I recently did some work on a (very new) transportable satellite 
system whose screeching HPA fans were unbearable 10 metres away!!

I also worked with radios designed for use in audibly quiet 
environment which had 4 fans in them - and whilst new they were 
reasonably quiet but as soon as their bearings assumed a bit of play 
during use, they became quite noisy.  I am glad to say that the 
follow on equipment was much quieter and only had one fan.

Has anyone considered using contact cooled valves and liquid thermal 
transport?

I am thinking here of the 4CX-250B tetrode and it's contact cooled 
variant type of thing.  BTW I am no designer of such kit but have 
seen it in use which might get round Berndt's dilema.

Has anyone got experience of remotely operating equipment - I am 
thinking receivers here remotely sited away from sources of 
interference such as telephone line ADSL and PLT and all the other 
sources of noise that are increasingly polluting our airwave 
environment such as Solar Panel Inverters (suddenly becoming very 
popular in the UK?  Transmitters similarly as Berndt relates in a 
block of flats will be anything but popular so remote operation 
becomes the only way to successfully pursue our hobby.

Any pointers greatly appreciated

Best wishes

John G8BSD