[Elecraft] Re： XV50, XV144, XV222 Assembly Manual

[Johnny Siu]

Hello David,

I think some group members have already answered your question about vent holes.

According to the manual, it should operate at either 20w SSB/CW or 10w FM fully duty cycle.  Even you operate at 10W FM, the case is still extremely hot.

As mentioned in this reflector many times, XV144 is very good but not cheap.  It is a waste if it can only operate in low duty cycle mode and become extremely hot under 10W FM.  Therefore, I modified it with reference to XV432 with an additional small fan inside and drill additional holes in the PCB.

Some of the group members replied to me on the heat issues off the list with variety of suggestions.

In conclusion, if XV144 is operated at FM mode even at the specified 10 watt, it is very hot.  I wrote my product review in www.eham.net

73

Johnny VR2XMC



----- 郵件原件 ----
寄件人﹕ David Pratt <david at g4dmp.fsnet.co.uk>
收件人﹕ Elecraft Reflector <elecraft at mailman.qth.net>
傳送日期﹕ 2009/12/13 (日) 4:01:45 AM
主題： [Elecraft] XV50, XV144, XV222 Assembly Manual

I have just been reading the Transverter XV50, XV144, XV222 Assembly 
Manual Rev B, March 2006 and notice on page 2 that the top cover has 
ventilation holes drilled in it.  My XV144 does not have any ventilation 
holes.

Should I drill some vent holes in the top cover, over the four 
metal-oxide resistors?  My XV144 does get hot and sometimes trips out if 
I transmit more than a few minutes. (Presumably F1, the resettable 
fuse.)

As there is space on the RF Board for a fan, similar to that used on the 
XV432, I am wondering whether there would be any advantage fitting a 
40mm x 40mm fan to the XV144?  Presumably, I would need to drill 
air-flow holes in the PCB and also in the bottom cover.

73
-- 
David G4DMP
Leeds, England, UK
------


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