[Amps] Power transformer for 600 watt rig

[Pat Barthelow]

This is quite informative...Question, From Gary's comment about Secondary Resistance, and choke input power supplies, not sufficient for SSB dynamic regulation, if one has available an older power supply, that is choke input, you need relatively low secondary resistance....Does the choke resistance have a lot of influence there also?   What are some typical values of HV choke resistances?   If so, then I think what you are saying, is  some (most?) choke input power supplies will have regulation issues with SSB.
Yes/No?

All the best,
Pat Barthelow    (916) 315-9271
aa6eg at hotmail.com
http://www.jamesburgdish.org


> From: garyschafer at comcast.net
> To: tonne at comcast.net; amps at contesting.com
> Date: Tue, 18 Mar 2008 11:08:59 -0400
> Subject: Re: [Amps] Power transformer for 600 watt rig
> 
> Hi Jim,
> 
> No I don't have LTspice.
> 
> What I was saying about what type of service the power supply is to expect
> to see matters a great deal. A transformer (a good one) that is to be used
> with a voltage doubler might have a secondary resistance in the neighborhood
> of 15 ohms.
> 
> A transformer to deliver the same power supply voltage using a choke input
> filter can get by with a transformer secondary resistance of a couple of
> hundred ohms.
> The dynamic regulation of the latter will be fine for an AM or FM rig but
> not acceptable for SSB.
> 
> 73
> Gary  K4FMX
> 
> 
> > -----Original Message-----
> > From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> > Behalf Of Jim Tonne
> > Sent: Monday, March 17, 2008 9:47 PM
> > To: garyschafer at comcast.net; 'Amps @ Contesting.com'
> > Subject: Re: [Amps] Power transformer for 600 watt rig
> > 
> > 
> > Gary:
> > 
> > Do you have LTspice?  I will plug those numbers
> > into the transformer model to complete the design.
> > The numbers I quoted are adequate for the problem
> > as stated.
> > 
> > - Jim Tonne
> 
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