[Elecraft] KPA500

[Jerry T. Dowell]

And too quiet!

It would not be advisable to operate a linear supply in close proximity to
the K3 or the K2. The resulting unwanted modulations have been discussed
previously. 

Jerry  AI6L

-----Original Message-----
From: Bob McGraw - K4TAX [mailto:RMcGraw at Blomand.net] 
Sent: Sunday, April 18, 2010 3:02 PM
To: Doug Faunt N6TQS +1-510-655-8604
Cc: elecraft at mailman.qth.net; M0XDF at Alphadene.co.uk; don at w3fpr.com
Subject: Re: [Elecraft] KPA500

I'll pass on linear supplies.  Too heavy, too inefficient.

73
Bob, K4TAX



----- Original Message ----- 
From: "Doug Faunt N6TQS +1-510-655-8604" <faunt at panix.com>
To: <RMcGraw at Blomand.net>
Cc: <don at w3fpr.com>; <M0XDF at Alphadene.co.uk>; <elecraft at mailman.qth.net>
Sent: Sunday, April 18, 2010 4:56 PM
Subject: Re: [Elecraft] KPA500


> It's not a switcher.  As is common for linear power supplies (and not
> uncommon for switchers), there's an input voltage selector as part of
> the input power connector/fuse/switch combo.
>
> Since the power transformer is 15 of the 22 pounds weight, one of my
> thoughts was to ship that part (or an extra) ahead when traveling, and
> when I asked was told that currently it takes about 15 minutes to
> install, but that time might be cut.
>
> 73, doug
>
>   From: "Bob McGraw - K4TAX" <RMcGraw at Blomand.net>
>   Date: Sun, 18 Apr 2010 16:24:43 -0500
>
>   Any switching supply today and one that's  "worth it's salt" should 
> operate
>   satisfactorily from 100 VAC to 250 VAC.   So 120 VAC or 230VAC should 
> not be
>   of conern.
>
>   73
>   Bob, K4TAX
>
>
>   ----- Original Message ----- 
>   From: "Don Wilhelm" <w3fpr at embarqmail.com>
>   To: "David Ferrington, M0XDF" <M0XDF at Alphadene.co.uk>
>   Cc: <elecraft at mailman.qth.net>
>   Sent: Friday, April 16, 2010 3:40 PM
>   Subject: Re: [Elecraft] KPA500
>
>   > David,
>   >
>   > Because not all have hamshacks that are wired for 220 volts.  If the
>   > space was not wired specifically for hamshack use, there is likely to 
> be
>   > only 120 volt receptacles available.   Up to 1000 watts draw (500 
> watts
>   > with 50% efficiency) on a normal 120 volt 15 amp circuit is practical,
>   > but attempting to run more than becomes marginal.
>   >
>   > 73,
>   > Don W3FPR
>   >
>   > David Ferrington, M0XDF wrote:
>   >> I'm intrigued, obviously we'd look for 220v over here, but why not 
> 120v
>   >> in US?
>   >> 73 de M0XDF, K3 #174
>