[R-390] Newbie Question Rack or Cabinet

[Roy Morgan]

On Feb 8, 2016, at 12:44 AM, Jerry <jsternmd at att.net> wrote:

> I have a very nice Collins R390 and EAC R390A.  I have the cabinets but due
> to space constraints I am thinking of stacking them in a small tabletop
> rack.  Does anyone see any operational problems such as more susceptibility
> to temp drift, etc.?

Do you intend to stack two radios in a single rack cabinet, or stack two separate R-390 type single radio cabinets on top of each other?

No problem either way, but do remove the top and bottom radio covers if they are present.  (Store them carefully - they are expensive to replace.)

Temperature DRIFT is not likely a problem, but heat buildup should be avoided - allow for plenty of air circulation and install even a very small fan to move the air around if you can.

If what you have is an R-390/URR, the “non-A” radio, then I STRONGLY urge you put a fan on or near the side of the radio that has a the 6082 series regulator tubes in there making WAY TOO MUCH HEAT.

I cobbled up a fan plate that mounts on the existing frame and bottom plate screws that will hold a 4-inch computer muffin fan against the holes at the regulator tubes and makes a HUGE difference in the temperature.  I have a picture with scales that will help you make one for yourself if you like.  I’m glad to send that to anyone interested.

If all you do is sit a muffin fan next to the side of the radio in the cabinet to move some air DO THAT.  It is the single most important thing you can do for an R-390/URR or R-391 radio.

Roy

Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958