[Amps] Re: more on the HFS1000G RFPP amplifier

[Rich]

>Certainly a consideration. If I build another one of those, I would 
>want to get a custom choke made, like I did in 1983. And capacitor. I 
>had a pair of polypropylene dielectric 0.97 uf 2500 VAC units, 
>similar to microwave oven caps, in series, across the choke. The 
>choke was tapped for 50 or 60 Hz action. Worked extremely well. 
>However, the C input does seem to be quite workable, if you limit 
>follow on energy in an arc as well as the surge current to the diodes 
>from charging the caps.
>
3A diodes are good for 200A-peak, and there are few transformers whose 
secondary is capable of anything close.    A glitch R in the HV+ is a 
good idea no matter what filter is used.  The main drawback to a C-filter 
is peak mains current.

>is a
>Our HFS1000G doesn't need the stiffer power supply, now that i have 
>closed loop control of the forward power with my ALC controller.
>
>Sidelight:
>
>At home, I am working on AM transmitter with choke input AND a big C. 
>Using a pair of chokes, one in the neg CT lead of the tranny, and 
>another in the plus ouput of the rectifiers. One is a 5-20 H 
>Thordarson swinging choke and the other is 8 H fixed I believe. Cap 
>is a single 40 uF NWL unit that I found, which was originally for 
>pulsed apps. I called them and they suggested it will be good for DC 
>filter at 120 Hz, no problem.
>
>73
>John
>K5PRO
>
>Rich suggests:
>>How about resonant-choke filtering?
>>
>
>
>-- 
>


-  Rich..., 805.386.3734, www.vcnet.com/measures.