[R-390] RE: [R-390]PTO Insulation (was) COSMOS PTO, starting over again.

[Phil Atchley]

Hi Paul.
You're probably right, however I kind of figured that in the case of rapid
changes the insulation might help.  Though in it's CV-979 cabinet it
shouldn't see any drafts from the air conditioner or heating systems.

73 de Phil, KO6BB
DX begins at the noise floor!
k06bb@elite.net
Merced, California
37.18N  120.29W  CM97sh

-----Original Message-----
 
On Sat, 12 Jul 2003, Phil Atchley wrote:

> HEATER NOTE:  This time upon disassembly I completely removed the
thermostat
> and the heaters from inside the PTO.  I NEVER use them anyway and they
just
> complicate the teardown-rebuild of the unit.  Yes, I'll keep the
insulation
> intact as I'm sure it adds to the thermal stability.

Phil - it has been great reading all your notes about your rebuild
experience.  I've got only Cosmos PTO's for my R-390A's, plus one spare
that I have taken partway apart.

Regarding the fiberglass insulation... it must be there to keep heat IN
the PTO with the heater running.  If the heater is off, or left out, the
blanket slows the absorption of heat from the radio.

Stability is reached when the temp is the same over time.

Therefore, I suspect that it would be better to leave the blanket off,
since you'd reach thermal soak more quickly (i.e. the radio heats the PTO
to the same temp).

Paul





---
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 7/10/2003
Tested on: 7/14/2003 9:57:32 PM
avast! is copyright (c) 2000-2003 ALWIL Software.
http://www.avast.com