[Boatanchors] Homebrew Power Supply

Tue Apr 9 19:59:09 EDT 2013

More like 700 x .67 or so for choke input filter.

Mac, K2GKK

To: Chnord at comcast.Net
From: bcarling at cfl.rr.com
CC: k2gkk at hotmail.com; w7qho at aol.com; drewrailleur807 at yahoo.com; w5jdy at cox.net; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Homebrew Power Supply
Date: Tue, 9 Apr 2013 19:55:21 -0400

Yeah.  I think he may have miscalculated. 700v x 1.4 = about 1000v DC to the RF final. 

Bry Carling
http://www.af4k.com
http://alltheaboveband.com

----- Reply message -----
From: "Chnord at comcast.Net" <Chnord at comcast.Net>
To: "bcarling at cfl.rr.com" <bcarling at cfl.rr.com>
Cc: "D C _Mac_ Macdonald" <k2gkk at hotmail.com>, "mac" <w7qho at aol.com>, "drewrailleur807 at yahoo.com" <drewrailleur807 at yahoo.com>, "- Cox" <w5jdy at cox.net>, "boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>
Subject: [Boatanchors] Homebrew Power Supply
Date: Tue, Apr 9, 2013 6:12 pm

That 6146 must be screaming in pain :)

Carl Nord
Sent from my IBM 360

On Apr 9, 2013, at 6:06 PM, "bcarling at cfl.rr.com" <bcarling at cfl.rr.com> wrote:

> If it needs 1400v CT then those 350-0-350v and especially 350-0-350v transformers will not cut the B Plus mustard.
> 
> Bry Carling
> http://www.af4k.com
> http://alltheaboveband.com
> 
> 
> ----- Reply message -----
> From: "D C _Mac_ Macdonald" <k2gkk at hotmail.com>
> To: "mac" <w7qho at aol.com>, <drewrailleur807 at yahoo.com>, "- Cox" <w5jdy at cox..net>
> Cc: "boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>
> Subject: [Boatanchors] Homebrew Power Supply
> Date: Tue, Apr 9, 2013 5:59 pm
> 
> 
> The "factory" supply for the AF-67 is the PS-2V. 
> 
> It is rated to deliver nominal 6 VAC @ 6A, or 12 VAC 
> @ 3A for filaments, 230 VDC @ 80 mA and 475 VDC
> @ 170 mA.  Separate plate and filament transformers 
> are provided. 
> 
> There is a 24 VAC tap on the filament transformer to 
> be used for control or a bias supply. 
> 
> Outputs of the plate transformer T2 are 1400 V C.T. 
> and 800 V C.T.
> 
> Output of the filament transformer T1 are 6VAC @ 1A 
> for a 6X5GT rectifier, 5 VAC @ 3 A for a 5U4G rectifier, 
> plus 6 VAC @ 6A or 12 VAC @ 3A for transmitter filaments
> and 24 VAC @ .1A for control/bias.
> 
> Both high voltage circuits are full-wave using choke input
> filtering. 
> 
> If you'd like to borrow my power supply manual to copy, Joe, 
> let me know.
> 
> 
> * * * * * * * * * * * 
> * 73 - Mac, K2GKK/5 * 
> * (Since 30 Nov 53) * 
> * k2gkk at hotmail.com * 
> * Oklahoma City, OK * 
> * USAF & FAA (Ret.) * 
> * * * * * * * * * * * 
> 
> 
> 
> 
> 
> 
>> From: w7qho at aol.com
>> To: drewrailleur807 at yahoo.com
>> Date: Tue, 9 Apr 2013 14:26:06 -0700
>> CC: boatanchors at mailman.qth.net
>> Subject: Re: [Boatanchors] Homebrew Power Supply
>> 
>> Let's see, this arrangement would require a transformer with a 
>> 185-0-185 vac secondary good for at least 350ma. No idea where to 
>> come up with such a unit.....
>> On Apr 8, 2013, at 7:26 PM, Drew P. wrote:
>> 
>>> Joe Walden wrote:
>>> 
>>> "Hello,from Joe w5jdy in Okla... I am in the process of building a 
>>> power
>>> supply for a Multi Elmac Transmitter model AF-67 and the Receiver 
>>> PRM-7....
>>> The particular specs I need is the power transformer secondary voltage
>>> ?ac-0-?ac.... This voltage is rectified with a solid state bridge 
>>> and has a 16 mfd input filter capacitor....... I need the output 
>>> voltage to be 500
>>> vdc at 250 ma..."
>>> 
>>> I assume that the full wave bridge would be connected to the outside 
>>> of the transformer's HV secondary winding, and that the bridge's 
>>> negative end would be connected to common.
>>> 
>>> With this arrangement and typical losses, 370 VAC to the full wave 
>>> bridge would give you about 500 VDC with a capacitor input filter 
>>> connected to the bridge's positive terminal. With the center tap 
>>> connected to another capacitor input filter, that other filter will 
>>> show about 250 VDC.
>>> 
>>> Drew
>                         
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