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.
----- Original Message -----
From: "Pat Barthelow" <firstname.lastname@example.org>
To: <email@example.com>; "'Jim Tonne'" <firstname.lastname@example.org>; "'Amps
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.
> All the best,
> Pat Barthelow (916) 315-9271
>> From: email@example.com
>> To: firstname.lastname@example.org; email@example.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
>> to see matters a great deal. A transformer (a good one) that is to be
>> with a voltage doubler might have a secondary resistance in the
>> of 15 ohms.
>> A transformer to deliver the same power supply voltage using a choke
>> 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.
>> Gary K4FMX
>> > -----Original Message-----
>> > From: firstname.lastname@example.org [mailto:email@example.com]
>> > On
>> > Behalf Of Jim Tonne
>> > Sent: Monday, March 17, 2008 9:47 PM
>> > To: firstname.lastname@example.org; '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
>> Amps mailing list
> Amps mailing list
Amps mailing list