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ZL1ANM > YAESU 14.12.04 23:56l 22 Lines 778 Bytes #999 (0) @ WW
BID : ZL1ANM13
Read: GUEST DK7JY
Subj: Re: FT290 Pluses.
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<DB0EEO<DB0GOS<ON0AR<ON0AR<7M3TJZ<ZL2BAU<
ZL1AB
Sent: 041214/2150Z @:ZL1AB.#11.NZL.OC #:6784 [AUCKLAND] FBB7.00g25 $:ZL1ANM13
From: ZL1ANM@ZL1AB.#11.NZL.OC
To : YAESU@WW
>From: G0TEZ@GB7HVU.#16.GBR.EU
>To : YAESU@WW
>The 2SC1969 is rated at 10W in Class A. It's maximum is 15W so, if you
>have any sort of SWR problem with your masive 2.5W O/P, you are likely to
>notice things going wrong long before the O/P transistor blows.
The implication here is that the 2SC1969 was being operated in Class A.
Class A is less than 50 percent efficient, and overall stage efficiency
is usually expected to be not much more than 25 % when output circuit
losses are factored in.
Your 2.5W output therefore means that the transistor was probably being
run at close to its maximum DC input of 10W.
73 de Neil, ZL1ANM
in Auckland.
T4 1.5à24
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