[Icom] IC-756PROII vs FT-1000MP MARK-V

Sun, 29 Dec 2002 16:30:28 -0500

Wayne,

Your point is well made. The ICOM IC-PS30 is also an excellent switching 
power supply, and although it is not an internal type power supply, is very 
clean and radiates little heat even under extended high duty-cycle modes 
such as RTTY. ICOM really had the design for a clean, efficient, 
cool-running switching power supply nailed 20 years ago.

73, Frank W3UHF

>From: Wayne <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [Icom] IC-756PROII vs FT-1000MP MARK-V
>Date: Tue, 24 Dec 2002 10:09:14 -0500
>
>
>
>I think in Ten Tec's case, its a convenient excuse. They have one point to
>make, and that is in regards to weight and possibly the 12 volt issue. The
>Paragon made enough digital hash all on its own, and Ten Tecs are the only
>radio I know of that are acutely sensitive to external power supply 
>location.
>
>The internal supply on the 751A and 740 was a high voltage inverter, and 
>was
>*dead* quiet. The internal supply in the MP is similarly dead quiet. Yes, I
>have done A/B comparisons and found *no* difference. I know of one case 
>where
>the internal supply tended to run hot, and that was in the case of the 
>Yaesu
>767. Largely, that was caused by the pass transistors and the PA sharing 
>the
>same heat sink.
>
>Internal supplies can indeed make heat and noise, but they needn't.  In the
>case of the Icom 740 and 751A, they add little heat at all, no noise and 
>the
>radio can be operated from an external 12V source in 10 seconds. Since they
>are high voltage inverters, the added weight is nominal. The radio comes 
>with
>a carrying handle. Regarding Ten Tec's position on internal supplies, all I
>can say is Icom was doing this routinely 20 years ago; whats the problem?
>
>
>
>
>
>Wayne
>VE3CE
>----
>Your Moderator: Dick Flanagan W6OLD, [email protected]
>Icom Users Net: Sundays, 1700Z, 14.315 MHz
>Icom FAQ: http://www.qsl.net/icom/

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