Although lots of time has passed, I wanted to let everyone know that I
had no luck lubricating the old PA muffin fan on my Orion II. I tried
everything everyone suggested and it simply got worse. It squealed quite
loudly in the end.
These are 60 mm x 25 mm x 60 mm muffin fans and common as dirt. I had
three in my one of my parts boxes, so I slapped in an old one and -- Lo!
And behold! -- it was quiet. This one turns in the opposite direction,
but that doesn't matter. I looked it up and, not only does it have ball
bearings, but it moves even more air (27 cfm vs 25 cfm) and uses less
current (0.14 A instead of 0.23 A). If yours wakes you up with a
surprising squeal, get anything of the stated size with ball bearings
and replace the old one! It's not worth your time to keep trying to
resurrect the original one.
Kim N5OP
On 5/13/2019 2:01 PM, Stuart Rohre wrote:
Kim had a great suggestion, which eases the application of new
lubricant to heat sink fans.?? Tilt the radio such that the central fan
bearing is pointing UP, before you heat up the fan to suck in new
lubricant on the cool down step.
The Fans at Mouser are so good and reasonably priced, that getting a
new fan overnight is a most time saving step. Match the overall
dimensions with the old fan.?? The new fans have a ball bearing model.
I have done the fan rejuvenation a number of times but last few
timees, I bouight new fans, and also rejuvenated the old one. That
way, I have plenty of spares for future use.
Stuart Rohre
K5KVH
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
--
Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
/"In theory there is no difference between theory and practice. But, in
practice, there is." //??? Attributed to many people; it???s so true that it
doesn???t matter who said it./
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|