[Amps] PSU Designer: How to model a glitch resistor ?

Steve Thompson g8gsq at ic24.net
Sat Oct 29 09:42:21 EDT 2005



Frank Goenninger DG1SBG wrote:
> To all with PSU Designer software experience:
> 
> I have modeled my PS in PSU Designer but I am seeing strange effects.

What is strange?
> 
> I have a 2.5 kV transformer with a secondary impedance of 7.5 Ohm. I  
> have a set of SKN3F20-08 diodes lined up in strings of 8 diodes in  
> series in each leg. The total capacity of my cap bank is 300uF with  
> an ESR of 0.47 Ohm for each cap.
> 
> I have planned to use a Globar model 888SP 50 Ohm 200 Watt resistor  
> as a glitch R.
> 
> Now I want to know what my output voltage is doing when I switch from  
> Receive to Transmit... assuming I am doing RTTY....
> 
> How do I correctly model this with the software to simulate the output ?

PSU designer will predict the volatge across the capacitors for 
different values of load resistance that you specify. The voltage at 
your PA will be this voltage less the drop in the glitch resistor - you 
will have to calculate that for each current value/load resistance.

Steve


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