Hi Eddy - Would you be up for one more test run??
I wonder what would happen WITHOUT the fan. Certainly the interior would warm up faster. A trade-off would 'perhaps' be a larger delta t from transmit to receive. Especially without an ambient air of 59F constantly being pulled through the cabinet.
As this is a T-4X, it is a bipolar PTO. The T-4XB and C had a FET PTO, "for better stability". The receiver PTOs switched from bipolar to FET early in the 'B' series.
73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs <www.k4oah.com> Eddy Swynar wrote:
Hi All, Before getting to the results, I should add here that the T-4X has a small cooling fan mounted above the amplifier cage, extracting air from inside it to the outside: it ran continuously whenever the rig was on during the course of both evaluations. Ambient room temperature in my basement was 59F, as before.
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