See my post to Gary.
Also check out old Thordason, Kenyon, UTC and other 1930's-50's catalogs
available on line for resistance values of fixed and swinging chokes.
Carl
KM1H
----- Original Message -----
From: "Pat Barthelow" <aa6eg@hotmail.com>
To: <garyschafer@comcast.net>; "'Jim Tonne'" <tonne@comcast.net>; "'Amps
@Contesting.com'" <amps@contesting.com>
Sent: Tuesday, March 18, 2008 12:11 PM
Subject: Re: [Amps] Power transformer for 600 watt rig
>
> 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@hotmail.com
> http://www.jamesburgdish.org
>
>
>> From: garyschafer@comcast.net
>> To: tonne@comcast.net; amps@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@contesting.com [mailto:amps-bounces@contesting.com]
>> > On
>> > Behalf Of Jim Tonne
>> > Sent: Monday, March 17, 2008 9:47 PM
>> > To: garyschafer@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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