|[AMRadio] Smoothing Choke|
ltaft at charter.net
Thu May 4 13:06:52 EDT 2006
Let me clear my perfectly description make!
10 hy 10 hy
Rectifier ------choke-------choke----|----HV out
0.08uf cap 8 uf
Larry Taft wrote:
> Typical values for a Gates BC-1G 1 KW broadcast transmitter 2500 VDC
> supply are 5-15 hy at 1 amp swinging choke with 8 uf filter cap. The
> load is 500 ma continuous for the class C final ( 2 833s in parallel)
> plus another 500 ma variable for the class B modulator ( 2 833s in
> push-pull). The audio frequency response is speced at 30 to 12,000
> cycles per second. The broadcast people used a single supply with the
> final acting as a fixed minimum load to get around the filter
> resonance problem at low frequencies.
> Collins also used a cap across a choke for parallel resonance. For
> the 20V3 there is a 10 hy choke with a 0.08 uf cap across it in
> parallel to a second 10 hy choke (no cap) to an 8 uf cap to ground.
> Again, the final is a fixed load for the single supply. Tubes are
> 4-400s. Audio speced at 50 to 10,000 cycles per second.
> Old technology. Still good as long as the limits are understood.
> Larry K2LT
> Jim candela wrote:
>> I understand your feel for the nostalgia, and passion for pursuing
>> All of us more or less on this group have some common ground here.
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