I put one of the silenx fans on my R4B. Cannot hear it running. THese
are SUPER quiet fans. I can take a picture but used a small rectifier
and cap off the filament supply..just like the T4X. The fan mounts with
double sided foam tapeover the slot between the rear plate and the power
transformer. I used a small business card stock baffle to direct the
air flow out between the transf. Pix later tonite.
You will not regret these fans.
Curt
KU8L
On 11/30/2011 3:13 PM, Paul Gerhardt wrote:
The results with this third (and final---I promise!) test were most
interesting (NOTE: for comparative purposes, I have
square-bracketed---[ ]---the changes observed at the very same time
intervals in the FIRST test, at the end of each observation line).
Here goes:
(1) 5455.0-KHz (cold start)---[0.0-Khz];
(2) 5455.0-KHz (unchanged)---[0.0-KHz];
(3) 5454.3-KHz (downward drift of 700-Hz from cold start)---[500-Hz];
(4) 5453.7 KHz (downward drift of 1.3-KHz from cold start)---[1.0-KHz];
(5) 5453.2-KHz (downward drift of 1.8-KHz from cold start)---[1.2-KHz], and,
(6) 5453.2-KHz (unchanged)---[0.0-KHz0
The end result in terms of PTO drift with the fan off was 1.8-KHz,
versus 1.2-KHz with the fan on. Interesting! That's a difference of
600-Hz, or HALF of the drift experienced with the fan running!
Thanks for doing this test! It is about what I get on the R4B as
well. The fan test is interesting I have thought about putting a fan
on but never have. If I do it would be nice to have a nice quiet fan.
Is there an advantage to a DC fan? It seems a AC fan might be easier
to wire up?
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