Posted by
Johnny Siu on
Feb 23, 2011; 10:56am
URL: http://elecraft.85.s1.nabble.com/K3-KPA500-on-a-generator-tp6034216p6055903.html
The main supply in Hong Kong is 220v 50Hz.
cheers,
Johnny VR2XMC
________________________________
寄件人﹕ Jeff Cochrane - VK4BOF <
[hidden email]>
收件人﹕ Ian White GM3SEK <
[hidden email]>;
[hidden email]
傳送日期﹕ 2011/2/23 (三) 4:46:58 PM
主題： Re: [Elecraft] FW: FW: K3: KPA500 on a generator?
I am absolutely sure that there are indeed KPA-500's operating with either 50hz
mains or generator usage at this time.
I do not for a minute believe that Wayne, Eric and the gang at Elecraft have not
thought of 50Hz operation.
(After all, 50Hz mains is far more prevalent than 60Hz mains in the world)
See
http://en.wikipedia.org/wiki/File:Weltkarte_der_Netzspannungen_und_Netzfrequenzen.svg for an interesting pic.
73 de
Jeff Cochrane - VK4BOF
Innisfail, QLD, Australia
Elecraft K3# 4257 + PR6 - K144XV = multiband goodness!
----- Original Message -----
From: Ian White GM3SEK
To:
[hidden email]
Sent: Wednesday, February 23, 2011 6:29 PM
Subject: Re: [Elecraft] FW: FW: K3: KPA500 on a generator?
Jim Brown wrote:
>On 2/19/2011 7:32 AM, Ian White GM3SEK wrote:
>> Very few US manufacturers are capable of in-house testing on 50Hz, so
>> it's good to see that Elecraft have placed a KPA500 with Brendan.
>
>//I can assure you that Elecraft engineers are smart enough to design
>for 50 Hz power.
>
Of course; but smart companies like Elecraft will also take good care to
*verify* their designs under actual conditions of use.
Operation from a 50Hz supply will push almost every aspect of a design
much closer to its margins, especially the temperature rise (which is
notoriously difficult to predict). Far too often, we in Europe have
literally had our fingers burned!
Jim himself has carried out a very important thermal stress test of the
KPA500, operating for many hours in an RTTY contest at a high CQ:RX
ratio. Those results ("stayed cool as a cucumber") are very
encouraging... so please can we look forward to a repeat on 50Hz, where
everything will get hotter?
--
73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek ______________________________________________________________
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